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ENG07 - Lifetime of OH masers at the tip of the asymptotic giant branch

Short title: Engels & Jiménez-Esteban (2007)
Authors: Engels, D. Jiménez-Esteban, F.
Journal: Astronomy and Astrophysics, Volume 475, Issue 3, December I 2007, pp.941-948
Bibcode:

Abstract
Context: A large fraction of otherwise similar asymptotic giant branch stars (AGB) do not show OH maser emission. As shown recently, a restricted lifetime may give a natural explanation as to why only part of any sample emits maser emission at a given epoch. Aims: We wish to probe the lifetime of 1612 MHz OH masers in circumstellar shells of AGB stars. Methods: We reobserved a sample of OH/IR stars discovered more than 28 years ago to determine the number of stars that may have since lost their masers. Results: We redetected all 114 OH masers. The minimum lifetime inferred is 2800 years (1sigma). This maser lifetime applies to AGB stars with strong mass loss leading to very red infrared colors. The velocities and mean flux density levels have not changed since their discovery. As the minimum lifetime is of the same order as the wind crossing time, strong variations in the mass-loss process affecting the excitation conditions on timescales of &ap3000 years or less are unlikely. eprintid: arXiv:0710.1697	Comments: Spectral type was set to: ""S"", where only one peak was found. ""D"", where two peaks were found. Velocity resolution: 0.11 km/s Upper limit for non-detections: mostly <0.3 Jy (3σ)

Abstract

Context: A large fraction of otherwise similar asymptotic giant branch stars (AGB) do not show OH maser emission. As shown recently, a restricted lifetime may give a natural explanation as to why only part of any sample emits maser emission at a given epoch.
Aims: We wish to probe the lifetime of 1612 MHz OH masers in circumstellar shells of AGB stars.
Methods: We reobserved a sample of OH/IR stars discovered more than 28 years ago to determine the number of stars that may have since lost their masers.
Results: We redetected all 114 OH masers. The minimum lifetime inferred is 2800 years (1sigma). This maser lifetime applies to AGB stars with strong mass loss leading to very red infrared colors. The velocities and mean flux density levels have not changed since their discovery. As the minimum lifetime is of the same order as the wind crossing time, strong variations in the mass-loss process affecting the excitation conditions on timescales of &ap3000 years or less are unlikely. eprintid:

Comments:
Spectral type was set to:
""S"", where only one peak was found.
""D"", where two peaks were found.

Velocity resolution: 0.11 km/s
Upper limit for non-detections: mostly <0.3 Jy (3σ)

Input tables: Table 1 and private communication
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Detection table from Engels & Jiménez-Esteban (2007)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Frequency	V_range	V_peak	F_peak	∫F dv	List	Detection	Type	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			(MHz)	(km/s)	(km/s)	(Jy)	(Jy*km/s)		Yes/No
1	17 51 48.8	-17 42 30	10.3715	4.5536	G10.373+4.554	OH10.5+4.5	1612	27.5	-70.9	2.000	3.3	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
2	18 03 38.9	-18 41 10	10.9256	1.6296	G10.926+1.630	OH10.9+1.5	1612	32.4	112.0	3.300	1.7	ENG15	+OH	SFR	ENG07
3	18 10 38.7	-18 52 57	11.5603	0.0875	G11.560+0.087	OH11.5+0.1	1612	43.4	20.2	6.300	23.1	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
4	18 13 8.8	-18 27 49	12.2125	-0.2306	G12.213-0.233	OH12.3-0.2	1612	38.5	23.0	8.700	9.7	ENG15	+OH +SiO	EVOLVED	ENG07
5	18 16 49.3	-18 15 02	12.8159	-0.8952	G12.816-0.895	OH12.8-0.9	1612	24.4	-68.3	9.400	4.5	ENG15	+H₂O +OH	EVOLVED	ENG07
6	18 10 6.1	-17 26 34	12.7590	0.8955	G12.758+0.896	OH12.8+0.9	1612	17.4	17.0	2.000	3.6	ENG15	-H₂O -CH₃OH I +OH -SiO	EVOLVED	ENG07
7	18 20 37	-18 47 11	12.7690	-1.9412	G12.769-1.941	OH12.8-1.9	1612	40.5	-8.1	15.900	33.4	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
8	17 55 45.1	-15 03 42	13.1445	5.0646	G13.145+5.065	OH13.1+5.0	1612	29.9	-82.4	19.100	13.8	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
9	18 12 3.4	-16 55 31	13.4375	0.7356	G13.437+0.736	OH13.4+0.8	1612	34.4	-20.9	1.600	1.2	ENG15	+OH +SiO	EVOLVED	ENG07
10	18 18 54	-15 34 39	15.4053	-0.0656	G15.405-0.066	OH15.4-0.1	1612	29.8	-43.0	1.800	3.1	ENG15	+OH	SFR	ENG07
11	18 11 34	-14 39 54	15.3636	1.9251	G15.364+1.925	OH15.4+1.9	1612	29.3	-2.8	10.900	5.3	ENG15	-H₂O -CH₃OH I +OH	EVOLVED	ENG07
12	18 16 25.7	-14 55 15	15.7006	0.7707	G15.701+0.770	OH15.7+0.8	1612	28.3	-15.5	55.800	44	ENG15	+H₂O -CH₃OH I -CH₃OH II +OH +SiO	EVOLVED	ENG07
13	18 21 6.9	-15 03 22	16.1170	-0.2904	G16.117-0.291	OH16.1-0.3	1612	44.4	-1.7	14.900	45.1	ENG15	+H₂O -CH₃OH I +CH₃OH II +OH +SiO	MIXED	ENG07
14	18 14 51.5	-14 16 19	16.0904	1.4137	G16.090+1.414	OH16.1+1.4	1612	34.3	29.8	0.900	1	ENG15	+OH -SiO	EVOLVED	ENG07
15	18 21 49.9	-14 10 35	16.9748	-0.0295	G16.975-0.029	OH17.0-0.1	1612	33.1	33.9	3.900	6.6	ENG15	-CH₃OH II +OH	EVOLVED	ENG07
16	18 26 15.7	-14 42 26	17.0077	-1.2257	G17.008-1.226	OH17.1-1.2	1612	20.9	-9.1	2.200	3.9	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
17	18 26 10.4	-14 28 19	17.2060	-1.0972	G17.206-1.097	OH17.2-1.1	1612	25.2	158.3	1.700	1.3	ENG15	+OH	EVOLVED	ENG07
18	18 23 35	-13 55 50	17.3913	-0.2892	G17.391-0.289	OH17.4-0.3	1612	33.9	12.2	12.300	12	ENG15	+OH +SiO	EVOLVED	ENG07
19	18 30 30.7	-14 28 58	17.6839	-2.0324	G17.684-2.032	OH17.7-2.0	1612	24.1	48.7	44.300	52.3	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
20	18 21 56.2	-12 55 22	18.0933	0.5373	G18.093+0.537	OH18.2+0.5	1612	24.3	113.4	1.800	1.8	ENG15	-H₂O +OH	UNK	ENG07
21	18 22 43.1	-12 47 42	18.2956	0.4291	G18.296+0.429	OH18.3+0.4	1612	30.7	32.3	7.200	8.5	ENG15	-H₂O +OH +SiO	EVOLVED	ENG07
22	18 19 35.5	-12 08 09	18.5181	1.4128	G18.518+1.413	OH18.5+1.4	1612	21.4	165.7	8.400	10.5	ENG15	+OH	EVOLVED	ENG07
23	18 19 40.6	-11 53 00	18.7506	1.5136	G18.751+1.514	OH18.7+1.6	1612	32.4	-17.0	5.100	2.9	ENG15	+OH	UNK	ENG07
24	18 24 5.3	-12 26 14	18.7683	0.3016	G18.769+0.302	OH18.8+0.4	1612	29.5	-2.5	39.900	39	ENG15	-H₂O -CH₃OH II +OH -SiO	EVOLVED	ENG07
25	18 29 28.6	-12 37 55	19.2086	-0.9527	G19.209-0.953	OH19.2-1.0	1612	25.4	32.0	3.000	8.5	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
26	18 12 22.7	-10 02 50	19.5187	3.9612	G19.519+3.961	OH19.5+4.0	1612	32.7	28.9	3.300	3.3	ENG15	-CH₃OH II +OH	EVOLVED	ENG07
27	18 28 13.9	-11 16 10	20.2741	-0.0505	G20.274-0.050	OH20.2-0.1	1612	32.8	10.2	10.200	10.2	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
28	18 33 34.2	-11 56 45	20.2794	-1.5224	G20.279-1.523	OH20.3-1.5	1612	24.8	-23.8	1.600	1.7	ENG15	-H₂O +OH +SiO	UNK	ENG07
29	18 23 28.7	-10 27 21	20.4493	1.3613	G20.448+1.362	OH20.4+1.4	1612	35.1	20.9	0.900	0.8	ENG15	+OH +SiO	EVOLVED	ENG07
30	18 27 56.3	-10 46 54	20.6725	0.2400	G20.672+0.240	OH20.6+0.3	1612	39.3	71.3	1.400	2.6	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
31	18 28 30.8	-10 50 52	20.6796	0.0842	G20.679+0.084	OH20.7+0.1	1612	36.5	117.9	20.700	20.3	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
32	18 31 23	-11 09 54	20.7249	-0.6869	G20.725-0.687	OH20.8-0.8	1612	32.4	31.0	1.500	0.9	ENG15	+OH	EVOLVED	ENG07
33	18 17 58.5	-09 18 31	20.8253	3.0969	G20.825+3.097	OH20.8+3.1	1612	28.4	12.3	3.000	3.7	ENG15	-H₂O +OH +SiO	EVOLVED	ENG07
34	18 28 30.9	-09 58 15	21.4564	0.4913	G21.457+0.491	OH21.5+0.5	1612	36.4	97.6	14.100	24.6	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
35	18 29 30.7	-09 39 50	21.8422	0.4163	G21.842+0.416	OH21.9+0.4	1612	35.9	67.4	4.300	4.8	ENG15	+OH	EVOLVED	ENG07
36	18 33 34.5	-09 57 36	22.0426	-0.6082	G22.043-0.608	OH22.1-0.6	1612	24.2	103.1	5.500	6.9	ENG15	-H₂O -CH₃OH II +OH -SiO	EVOLVED	ENG07
37	18 40 38.5	-10 42 35	22.1737	-2.4964	G22.174-2.496	OH22.3-2.5	1612	27.5	98.1	1.700	1.2	ENG15	-CH₃OH II +OH	EVOLVED	ENG07
38	18 34 11.3	-08 58 02	22.9933	-0.2847	G22.993-0.285	OH23.1-0.3	1612	28.9	20.2	11.500	12.8	ENG15	+H₂O -CH₃OH II +OH	MIXED	ENG07
39	18 30 6.9	-07 36 50	23.7281	1.2342	G23.727+1.235	OH23.7+1.2	1612	28.6	-13.9	8.600	8.4	ENG15	+H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
40	18 33 49.6	-08 04 01	23.7510	0.2096	G23.751+0.210	OH23.8+0.2	1612	21.1	95.8	1.600	3.5	ENG15	-H₂O +OH	EVOLVED	ENG07
41	18 38 39.8	-08 41 12	23.7506	-1.1376	G23.751-1.138	OH23.8-1.1	1612	27.7	34.5	2.700	2.9	ENG15	+OH +SiO	UNK	ENG07
42	18 33 9.8	-07 27 58	24.2084	0.6325	G24.208+0.633	OH24.3+0.7	1612	31.2	42.8	0.600	1.8	ENG15	-H₂O +OH	EVOLVED	ENG07
43	18 35 19	-07 19 23	24.5814	0.2246	G24.581+0.224	OH24.5+0.3	1612	27.3	-86.3	9.600	6.8	ENG15	-H₂O +OH -SiO	EVOLVED	ENG07
44	18 36 45.9	-07 18 17	24.7628	-0.0858	G24.763-0.086	OH24.7-0.1	1612	43.8	63.5	1.900	5.3	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
45	18 35 57.4	-07 18 57	24.6608	0.0871	G24.661+0.087	OH24.7+0.1	1612	31.3	40.6	4.400	5.1	ENG15	+OH +SiO	EVOLVED	ENG07
46	18 35 29.2	-07 13 11	24.6925	0.2348	G24.693+0.235	OH24.7+0.3	1612	37.9	21.3	6.400	12.8	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
47	18 42 22	-08 05 00	24.7064	-1.6761	G24.706-1.677	OH24.7-1.7	1612	26.3	78.5	3.300	3.1	ENG15	+OH	EVOLVED	ENG07
48	18 38 15.4	-07 09 54	25.0568	-0.3503	G25.057-0.350	OH25.1-0.3	1612	24.6	130.3	7.200	4.8	ENG15	-H₂O -CH₃OH I +OH	EVOLVED	ENG07
49	18 38 50.5	-06 44 50	25.4946	-0.2877	G25.495-0.288	OH25.5-0.3	1612	33.6	19.8	4.000	8.3	ENG15	-H₂O -CH₃OH I -CH₃OH II +OH	MIXED	ENG07
50	18 36 44	-06 27 24	25.5124	0.3108	G25.512+0.311	OH25.5+0.4	1612	31.9	23.0	2.600	4.7	ENG15	+OH	EVOLVED	ENG07
51	18 41 14.4	-06 15 01	26.2093	-0.5896	G26.209-0.589	OH26.2-0.6	1612	43.2	49.8	17.700	24	ENG15	+H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
52	18 38 38.8	-05 49 10	26.2968	0.1809	G26.297+0.181	OH26.3+0.1	1612	27.3	-40.0	1.400	1.4	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
53	18 46 26.8	-06 40 33	26.4212	-1.9346	G26.421-1.935	OH26.4-1.9	1612	24.3	15.7	13.000	9.6	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
54	18 49 16.8	-07 13 47	26.2474	-2.8127	G26.247-2.813	OH26.4-2.8	1612	24.1	-78.6	3.900	3.4	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
55	18 37 32.5	-05 23 59	26.5436	0.6177	G26.543+0.618	OH26.5+0.6	1612	27.7	13.2	110.100	139.6	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
56	18 42 1.9	-05 21 07	27.0982	-0.3537	G27.098-0.354	OH27.0-0.4	1612	29.0	87.3	4.200	5.2	ENG15	+OH	EVOLVED	ENG07
57	18 40 16.4	-05 02 39	27.1715	0.1764	G27.171+0.176	OH27.2+0.2	1612	38.2	73.4	2.200	1.5	ENG15	+OH +SiO	MIXED	ENG07
58	18 40 21.9	-04 57 11	27.2629	0.1978	G27.263+0.198	OH27.3+0.2	1612	25.1	38.0	44.600	38.9	ENG15	-CH₃OH II +OH	EVOLVED	ENG07
59	18 44 41.6	-05 09 18	27.5762	-0.8531	G27.576-0.853	OH27.5-0.9	1612	25.0	93.1	7.100	7.1	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
60	18 47 37.8	-05 11 08	27.8825	-1.5177	G27.882-1.516	OH27.8-1.5	1612	30.4	69.9	1.500	2.6	ENG15	-H₂O +OH +SiO	EVOLVED	ENG07
61	18 43 25.8	-03 55 55	28.5204	-0.0143	G28.520-0.014	OH28.5-0.0	1612	26.8	94.1	10.300	13.8	ENG15	-H₂O +OH +SiO	MIXED	ENG07
62	18 45 48.3	-04 00 46	28.7190	-0.5782	G28.719-0.578	OH28.7-0.6	1612	34.9	29.0	8.200	8.5	ENG15	+H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
63	18 47 49.9	-03 29 31	29.4132	-0.7905	G29.413-0.791	OH29.4-0.8	1612	20.3	113.7	5.700	17	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
64	18 47 9.8	-02 35 36	30.1368	-0.2321	G30.137-0.232	OH30.1-0.2	1612	34.9	33.0	12.800	16.8	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
65	18 48 42	-02 50 29	30.0911	-0.6867	G30.091-0.686	OH30.1-0.7	1612	40.4	78.5	49.400	65.9	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
66	18 45 52.4	-01 46 43	30.7146	0.4265	G30.715+0.427	OH30.7+0.4	1612	35.2	48.8	9.100	10	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
67	18 47 41.2	-01 45 11	30.9442	0.0350	G30.944+0.035	OH31.0+0.0	1612	12.6	27.7	1.300	0.2	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
68	18 48 43.1	-01 48 30	31.0126	-0.2196	G31.012-0.219	OH31.0-0.2	1612	25.2	112.3	44.000	45.9	ENG15	+H₂O -CH₃OH II +OH -SiO	MIXED	ENG07
69	18 49 05	-01 17 02	31.5209	-0.0616	G31.521-0.062	OH31.5-0.1	1612	29.8	20.2	3.800	3.3	ENG15	+OH	MIXED	ENG07
70	18 52 1.4	-01 26 47	31.7113	-0.7897	G31.712-0.790	OH31.7-0.8	1612	25.6	66.0	2.100	1.3	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
71	18 51 26.2	-01 03 52	31.9844	-0.4851	G31.984-0.485	OH32.0-0.5	1612	40.6	55.2	12.500	24.5	ENG15	+H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
72	18 46 38.7	-00 17 14	32.1298	0.9354	G32.130+0.935	OH32.1+0.9	1612	24.8	124.8	2.300	1.6	ENG15	-H₂O +OH	EVOLVED	ENG07
73	18 52 22.2	-00 14 11	32.8278	-0.3152	G32.827-0.316	OH32.8-0.3	1612	30.4	45.6	25.700	55.9	ENG15	+H₂O +CH₃OH I +CH₃OH II +OH +SiO	MIXED	ENG07
74	18 52 27.9	+00 27 30	33.4569	-0.0195	G33.457-0.020	OH33.4-0.0	1612	32.0	44.4	4.100	4.3	ENG15	+OH	UNK	ENG07
75	18 51 15.9	+01 56 19	34.6377	0.9223	G34.638+0.922	OH34.7+0.9	1612	31.3	12.4	3.200	4.2	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
76	18 52 15.3	+02 03 48	34.8615	0.7590	G34.861+0.759	OH34.9+0.8	1612	28.3	54.4	1.700	2.1	ENG15	-H₂O +OH	UNK	ENG07
77	19 05 02	+00 48 51	35.2083	-2.6526	G35.209-2.653	OH35.2-2.6	1612	21.4	40.7	4.800	21.8	ENG15	-H₂O +OH	EVOLVED	ENG07
78	18 57 27.4	+02 12 18	35.5804	-0.3328	G35.580-0.333	OH35.6-0.3	1612	27.2	64.3	26.900	30.2	ENG15	-H₂O +OH +SiO	MIXED	ENG07
79	18 56 36.4	+03 06 53	36.2929	0.2713	G36.292+0.271	OH36.4+0.3	1612	37.1	83.9	3.000	3.3	ENG15	+H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
80	18 54 16	+04 02 32	36.8521	1.2139	G36.852+1.214	OH36.9+1.3	1612	15.6	-20.0	6.300	3.4	ENG15	+OH	EVOLVED	ENG07
81	19 02 6.3	+03 20 16	37.1185	-0.8474	G37.118-0.847	OH37.1-0.8	1612	25.2	76.8	7.000	10.7	ENG15	+H₂O -CH₃OH I -CH₃OH II +OH +SiO	EVOLVED	ENG07
82	19 05 9.7	+03 40 58	37.7747	-1.3674	G37.775-1.367	OH37.7-1.4	1612	21.4	100.4	2.800	1.3	ENG15	+OH	EVOLVED	ENG07
83	18 58 30.1	+06 42 55	39.7125	1.4946	G39.713+1.495	OH39.7+1.5	1612	32.5	3.6	58.600	75.7	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
84	19 04 9.6	+06 13 16	39.9160	0.0186	G39.916+0.018	OH39.9-0.0	1612	29.2	134.2	6.400	10.6	ENG15	-H₂O +OH +SiO	MIXED	ENG07
85	18 55 56.9	+07 30 28	40.1297	2.4195	G40.130+2.420	OH40.1+2.4	1612	37.2	28.3	1.100	1.1	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
86	19 09 8.2	+08 16 34	42.3084	-0.1324	G42.308-0.132	OH42.3-0.1	1612	32.7	43.2	16.400	22.7	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
87	19 08 58.4	+08 37 49	42.6040	0.0668	G42.604+0.066	OH42.6+0.0	1612	35.5	35.2	4.700	5.6	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
88	19 13 36.4	+08 22 39	42.9096	-1.0659	G42.900-1.078	OH42.8-1.0	1612	25.4	-28.7	1.900	2.2	ENG15	+OH	EVOLVED	ENG07
89	19 12 46.9	+09 18 24	43.6385	-0.4546	G43.639-0.455	OH43.6-0.5	1612	23.1	59.8	2.600	1.6	ENG15	+OH	UNK	ENG07
90	19 09 31.8	+09 51 50	43.7620	0.5138	G43.762+0.513	OH43.8+0.5	1612	23.6	-2.9	6.600	5.8	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
91	19 15 16.4	+09 15 45	43.8848	-1.0196	G43.885-1.020	OH43.9-1.0	1612	26.1	38.6	1.700	0.8	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
92	19 06 42.8	+10 14 33	43.7789	1.3036	G43.779+1.303	OH43.9+1.2	1612	31.5	34.0	2.400	2	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
93	19 21 36.6	+09 27 57	44.7951	-2.3066	G44.795-2.307	OH44.8-2.3	1612	32.2	-87.7	10.400	10.1	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
94	19 14 19.6	+11 10 35	45.4712	0.0762	G45.471+0.076	OH45.5+0.1	1612	34.3	18.3	14.500	15	ENG15	-H₂O +OH +SiO	EVOLVED	ENG07
95	19 27 42.1	+16 37 25	51.8042	-0.2249	G51.804-0.224	OH51.8-0.2	1612	37.3	-17.1	5.400	7.3	ENG15	+H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
96	19 21 31.5	+18 10 09	52.4679	1.8047	G52.468+1.805	OH52.4+1.8	1612	28.6	1.0	3.800	2.7	ENG15	-H₂O -CH₃OH I -CH₃OH II +OH	EVOLVED	ENG07
97	19 31 25.3	+18 13 10	53.6301	-0.2390	G53.630-0.239	OH53.6-0.2	1612	26.8	-2.4	8.400	9.8	ENG15	-H₂O +OH	MIXED	ENG07
98	19 30 29.4	+19 50 41	54.9493	0.7356	G54.949+0.735	OH55.0+0.7	1612	28.0	13.6	12.800	14.8	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
99	19 31 38.9	+22 35 17	57.4855	1.8173	G57.485+1.817	OH57.5+1.8A	1612	25.2	-86.3	1.600	1.9	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
100	19 31 45.5	+22 33 42	57.4745	1.7823	G57.475+1.781	OH57.5+1.8B	1612	4.3	36.2	1.400	2.2	ENG15	-H₂O -CH₃OH II +OH -SiO	EVOLVED	ENG07
101	19 52 57.9	+27 07 45	63.8276	-0.1243	G63.827-0.124	OH63.9-0.2	1612	30.2	-9.3	1.400	1.7	ENG15	+H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
102	19 51 21.2	+29 13 01	65.4393	1.2497	G65.439+1.250	OH65.5+1.3	1612	34.0	-38.8	4.400	6.9	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
103	19 59 39.4	+28 23 10	65.6706	-0.7366	G65.669-0.736	OH65.7-0.8	1612	21.8	-69.3	2.000	2.4	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
104	20 04 20.8	+29 04 07	66.7942	-1.2473	G66.794-1.247	OH66.8-1.3	1612	24.3	-76.9	2.300	2.6	ENG15	-H₂O +OH +SiO	EVOLVED	ENG07
105	20 29 8.5	+35 45 42	75.2678	-1.8425	G75.268-1.842	OH75.3-1.8	1612	23.2	-14.9	3.400	3.7	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
106	20 28 30.7	+39 07 00	77.9158	0.2219	G77.916+0.223	OH77.9+0.2	1612	21.8	-48.9	11.000	8.5	ENG15	-H₂O +OH	EVOLVED	ENG07
107	20 46 25.5	+40 06 58	80.7980	-1.9211	G80.798-1.921	OH80.8-1.9	1612	45.8	-23.2	585.200	1152.4	ENG15	+H₂O -CH₃OH I -CH₃OH II +OH +SiO	EVOLVED	ENG07
108	20 50 58.6	+42 48 12	83.4223	-0.8890	G83.419-0.889	OH83.4-0.9	1612	36.2	-55.9	14.400	11.6	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
109	20 53 38	+44 58 07	85.3935	0.1268	G85.394+0.127	OH85.4+0.1	1612	27.2	-35.7	5.900	3	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
110	22 19 27.2	+59 51 20	104.9075	2.4134	G104.908+2.413	OH104.9+2.4	1612	29.8	-39.8	22.200	36.4	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
111	01 33 51.2	+62 26 53	127.8147	-0.0209	G127.815-0.021	OH127.8+0.0	1612	22.2	-65.2	110.900	67.3	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
112	03 25 8.4	+65 32 07	137.9699	7.2557	G137.970+7.256	OH138.0+7.2	1612	18.8	-46.5	30.200	18.5	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
113	03 33 30.5	+60 20 09	141.7246	3.5188	G141.725+3.519	OH141.7+3.5	1612	24.2	-69.1	7.000	4.9	ENG15	+H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
114	18 16 25.7	-14 55 15	15.7006	0.7707	G15.701+0.770	OH15.7+0.8	1665	9.2	-9.2	0.700	1.1	ENG15	+H₂O -CH₃OH I -CH₃OH II +OH +SiO	EVOLVED	ENG07
115	17 55 45.1	-15 03 42	13.1445	5.0646	G13.145+5.065	OH13.1+5.0	1665	79.7	-79.7	1.000	0.9	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
116	18 13 8.8	-18 27 49	12.2125	-0.2306	G12.213-0.233	OH12.3-0.2	1665	27.4	27.4	2.900	2	ENG15	+OH +SiO	EVOLVED	ENG07
117	18 10 38.7	-18 52 57	11.5603	0.0875	G11.560+0.087	OH11.5+0.1	1665	24.2	38.3	0.500		ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
118	18 30 30.7	-14 28 58	17.6839	-2.0324	G17.684-2.032	OH17.7-2.0	1665	26.2	47.7	1.100	0.9	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
119	18 33 9.8	-07 27 58	24.2084	0.6325	G24.208+0.633	OH24.3+0.7	1665	44.8	44.8	0.600	1.1	ENG15	-H₂O +OH	EVOLVED	ENG07
120	18 37 32.5	-05 23 59	26.5436	0.6177	G26.543+0.618	OH26.5+0.6	1665	29.1	12.1	3.300	1.9	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
121	18 47 49.9	-03 29 31	29.4132	-0.7905	G29.413-0.791	OH29.4-0.8	1665	18.6	115.4	0.600	0.7	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
122	18 47 41.2	-01 45 11	30.9442	0.0350	G30.944+0.035	OH31.0+0.0	1665	12.1	27.4	3.400	2.2	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
123	18 48 43.1	-01 48 30	31.0126	-0.2196	G31.012-0.219	OH31.0-0.2	1665	28.7	110.5	2.100	0.5	ENG15	+H₂O -CH₃OH II +OH -SiO	MIXED	ENG07
124	19 05 02	+00 48 51	35.2083	-2.6526	G35.209-2.653	OH35.2-2.6	1665	20.7	39.5	1.900	2.2	ENG15	-H₂O +OH	EVOLVED	ENG07
125	19 09 8.2	+08 16 34	42.3084	-0.1324	G42.308-0.132	OH42.3-0.1	1665	32.4	42.9	0.600	1.8	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
126	19 31 25.3	+18 13 10	53.6301	-0.2390	G53.630-0.239	OH53.6-0.2	1665	18.1	2.2	1.500	4.5	ENG15	-H₂O +OH	MIXED	ENG07
127	20 28 30.7	+39 07 00	77.9158	0.2219	G77.916+0.223	OH77.9+0.2	1665	21.4	-48.8	0.600	0.6	ENG15	-H₂O +OH	EVOLVED	ENG07
128	20 46 25.5	+40 06 58	80.7980	-1.9211	G80.798-1.921	OH80.8-1.9	1665	31.4	-16.2	1.100	3.8	ENG15	+H₂O -CH₃OH I -CH₃OH II +OH +SiO	EVOLVED	ENG07
129	03 25 8.4	+65 32 07	137.9699	7.2557	G137.970+7.256	OH138.0+7.2	1665	20.9	-47.8	0.200	0.1	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
130	03 33 30.5	+60 20 09	141.7246	3.5188	G141.725+3.519	OH141.7+3.5	1665	70.4	-70.4	0.700	0.3	ENG15	+H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
131	18 03 38.9	-18 41 10	10.9256	1.6296	G10.926+1.630	OH10.9+1.5	1667	33.2	112.0	0.500	0.6	ENG15	+OH	SFR	ENG07
132	18 10 38.7	-18 52 57	11.5603	0.0875	G11.560+0.087	OH11.5+0.1	1667	55.4	13.1	0.800	6.1	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
133	18 13 8.8	-18 27 49	12.2125	-0.2306	G12.213-0.233	OH12.3-0.2	1667	27.2	27.2	1.500	2.4	ENG15	+OH +SiO	EVOLVED	ENG07
134	18 16 49.3	-18 15 02	12.8159	-0.8952	G12.816-0.895	OH12.8-0.9	1667	66.7	-66.7	1.500	1.2	ENG15	+H₂O +OH	EVOLVED	ENG07
135	18 10 6.1	-17 26 34	12.7590	0.8955	G12.758+0.896	OH12.8+0.9	1667	18.1	19.1	0.400	0.8	ENG15	-H₂O -CH₃OH I +OH -SiO	EVOLVED	ENG07
136	18 11 34	-14 39 54	15.3636	1.9251	G15.364+1.925	OH15.4+1.9	1667	28.5	-2.2	0.700	1	ENG15	-H₂O -CH₃OH I +OH	EVOLVED	ENG07
137	18 16 25.7	-14 55 15	15.7006	0.7707	G15.701+0.770	OH15.7+0.8	1667	30.1	-15.5	1.700	3.8	ENG15	+H₂O -CH₃OH I -CH₃OH II +OH +SiO	EVOLVED	ENG07
138	18 21 6.9	-15 03 22	16.1170	-0.2904	G16.117-0.291	OH16.1-0.3	1667	44.9	-0.8	3.400	8.1	ENG15	+H₂O -CH₃OH I +CH₃OH II +OH +SiO	MIXED	ENG07
139	18 21 49.9	-14 10 35	16.9748	-0.0295	G16.975-0.029	OH17.0-0.1	1667	31.9	35.4	0.300	0.1	ENG15	-CH₃OH II +OH	EVOLVED	ENG07
140	18 26 15.7	-14 42 26	17.0077	-1.2257	G17.008-1.226	OH17.1-1.2	1667	20.6	-4.6	0.400	0.9	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
141	18 23 35	-13 55 50	17.3913	-0.2892	G17.391-0.289	OH17.4-0.3	1667	33.2	11.9	0.600	0.8	ENG15	+OH +SiO	EVOLVED	ENG07
142	18 30 30.7	-14 28 58	17.6839	-2.0324	G17.684-2.032	OH17.7-2.0	1667	26.5	47.6	1.000	0.8	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
143	18 22 43.1	-12 47 42	18.2956	0.4291	G18.296+0.429	OH18.3+0.4	1667	30.8	33.1	0.700	1.1	ENG15	-H₂O +OH +SiO	EVOLVED	ENG07
144	18 24 5.3	-12 26 14	18.7683	0.3016	G18.769+0.302	OH18.8+0.4	1667	32.6	-3.3	4.400	5.8	ENG15	-H₂O -CH₃OH II +OH -SiO	EVOLVED	ENG07
145	18 29 35.5	-11 15 54	20.4328	-0.3438	G20.433-0.344	OH20.4-0.3	1667	28.0	31.8	0.300	0.6	ENG15	-H₂O +OH +SiO	EVOLVED	ENG07
146	18 27 56.3	-10 46 54	20.6725	0.2400	G20.672+0.240	OH20.6+0.3	1667	79.5	79.5	0.800	0.8	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
147	18 28 30.8	-10 50 52	20.6796	0.0842	G20.679+0.084	OH20.7+0.1	1667	38.1	117.4	4.600	6.1	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
148	18 31 23	-11 09 54	20.7249	-0.6869	G20.725-0.687	OH20.8-0.8	1667	26.2	30.2	0.400	0.1	ENG15	+OH	EVOLVED	ENG07
149	18 28 30.9	-09 58 15	21.4564	0.4913	G21.457+0.491	OH21.5+0.5	1667	36.6	96.2	2.400	2.3	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
150	18 33 49.6	-08 04 01	23.7510	0.2096	G23.751+0.210	OH23.8+0.2	1667	19.9	95.5	0.400	0.4	ENG15	-H₂O +OH	EVOLVED	ENG07
151	18 33 9.8	-07 27 58	24.2084	0.6325	G24.208+0.633	OH24.3+0.7	1667	45.4	45.4	0.600	1.7	ENG15	-H₂O +OH	EVOLVED	ENG07
152	18 36 45.9	-07 18 17	24.7628	-0.0858	G24.763-0.086	OH24.7-0.1	1667	76.6	76.6	0.600	3	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
153	18 35 57.4	-07 18 57	24.6608	0.0871	G24.661+0.087	OH24.7+0.1	1667	34.0	39.4	0.700	0.5	ENG15	+OH +SiO	EVOLVED	ENG07
154	18 36 44	-06 27 24	25.5124	0.3108	G25.512+0.311	OH25.5+0.4	1667	34.1	21.6	0.500	0.6	ENG15	+OH	EVOLVED	ENG07
155	18 37 32.5	-05 23 59	26.5436	0.6177	G26.543+0.618	OH26.5+0.6	1667	27.1	13.2	10.000	21.2	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
156	18 40 21.9	-04 57 11	27.2629	0.1978	G27.263+0.198	OH27.3+0.2	1667	36.8	36.8	0.800	1.4	ENG15	-CH₃OH II +OH	EVOLVED	ENG07
157	18 44 41.6	-05 09 18	27.5762	-0.8531	G27.576-0.853	OH27.5-0.9	1667	92.6	92.6	1.800	1	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
158	18 48 42	-02 50 29	30.0911	-0.6867	G30.091-0.686	OH30.1-0.7	1667	42.5	77.4	3.000	4.7	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
159	18 45 52.4	-01 46 43	30.7146	0.4265	G30.715+0.427	OH30.7+0.4	1667	34.6	49.5	0.600	1.1	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
160	18 47 41.2	-01 45 11	30.9442	0.0350	G30.944+0.035	OH31.0+0.0	1667	13.5	27.1	3.000	5	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
161	18 52 22.2	-00 14 11	32.8278	-0.3152	G32.827-0.316	OH32.8-0.3	1667	32.5	44.5	2.300	5.6	ENG15	+H₂O +CH₃OH I +CH₃OH II +OH +SiO	MIXED	ENG07
162	18 51 15.9	+01 56 19	34.6377	0.9223	G34.638+0.922	OH34.7+0.9	1667	13.4	13.4	0.300	0.4	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
163	19 05 02	+00 48 51	35.2083	-2.6526	G35.209-2.653	OH35.2-2.6	1667	44.7	31.0	0.500	2	ENG15	-H₂O +OH	EVOLVED	ENG07
164	19 02 6.3	+03 20 16	37.1185	-0.8474	G37.118-0.847	OH37.1-0.8	1667	28.9	74.1	0.400	0.5	ENG15	+H₂O -CH₃OH I -CH₃OH II +OH +SiO	EVOLVED	ENG07
165	19 08 58.4	+08 37 49	42.6040	0.0668	G42.604+0.066	OH42.6+0.0	1667	34.7	35.2	0.500	1.1	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
166	19 09 31.8	+09 51 50	43.7620	0.5138	G43.762+0.513	OH43.8+0.5	1667	26.2	-3.7	0.300	0.1	ENG15	+H₂O -CH₃OH II +OH +SiO	MIXED	ENG07
167	19 14 19.6	+11 10 35	45.4712	0.0762	G45.471+0.076	OH45.5+0.1	1667	35.5	16.9	1.000	0.4	ENG15	-H₂O +OH +SiO	EVOLVED	ENG07
168	19 21 31.5	+18 10 09	52.4679	1.8047	G52.468+1.805	OH52.4+1.8	1667	30.7	-0.4	1.000	0.7	ENG15	-H₂O -CH₃OH I -CH₃OH II +OH	EVOLVED	ENG07
169	19 31 25.3	+18 13 10	53.6301	-0.2390	G53.630-0.239	OH53.6-0.2	1667	28.5	-4.1	3.600	2.8	ENG15	-H₂O +OH	MIXED	ENG07
170	19 30 29.4	+19 50 41	54.9493	0.7356	G54.949+0.735	OH55.0+0.7	1667	31.3	12.1	1.200	1.6	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
171	20 04 20.8	+29 04 07	66.7942	-1.2473	G66.794-1.247	OH66.8-1.3	1667	26.4	-77.9	0.400	0.5	ENG15	-H₂O +OH +SiO	EVOLVED	ENG07
172	20 29 8.5	+35 45 42	75.2678	-1.8425	G75.268-1.842	OH75.3-1.8	1667	25.0	-15.6	0.600	0.8	ENG15	-H₂O -CH₃OH II +OH	EVOLVED	ENG07
173	20 46 25.5	+40 06 58	80.7980	-1.9211	G80.798-1.921	OH80.8-1.9	1667	53.9	-28.5	0.300	5.2	ENG15	+H₂O -CH₃OH I -CH₃OH II +OH +SiO	EVOLVED	ENG07
174	20 53 38	+44 58 07	85.3935	0.1268	G85.394+0.127	OH85.4+0.1	1667	27.2	-36.6	0.400	0.4	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
175	22 19 27.2	+59 51 20	104.9075	2.4134	G104.908+2.413	OH104.9+2.4	1667	30.8	-41.4	0.700	1.2	ENG15	+H₂O +OH +SiO	EVOLVED	ENG07
176	01 33 51.2	+62 26 53	127.8147	-0.0209	G127.815-0.021	OH127.8+0.0	1667	21.7	-65.6	0.400	2.7	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07
177	03 25 8.4	+65 32 07	137.9699	7.2557	G137.970+7.256	OH138.0+7.2	1667	18.8	-46.4	2.900	1.1	ENG15	-H₂O -CH₃OH II +OH +SiO	EVOLVED	ENG07

Non-detection table from Engels & Jiménez-Esteban (2007)