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SIV04 - Searches for OH masers in the circumstellar envelopes of red giant irregular variable stars

Short title: Sivagnanam (2004)
Authors: Sivagnanam, P.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 347, Issue 4, pp. 1084-1092.
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (0 detection) Non-detection table: Show non-detection table (108 non-detection)

Abstract
Irregular variables of type Lb share many characteristics with asymptotic giant branch (AGB) stars such as Miras and semiregulars (SRs). Despite their large number, irregulars are poorly understood. Using the large Nan�ay radio telescope, we searched for 18-cm OH maser emission from these stars. We selected two samples of Lbs that present a noticeable circumstellar envelope. In the first one, 44 high-latitude objects with infrared colours of dusty mass-losing stars were observed in a wide-bandwidth velocity-search mode. In addition, 16 objects (including six from the first sample), in which other circumstellar molecular lines had recently been found, were observed with higher resolution and sensitivity. We did not detect any new OH maser emission from these samples down to 3sigma sensitivity limits ranging from 30 to 200 mJy. We derived upper limits for the efficiency of a typical pump using far-infrared photons. When compared with known OH masers in AGB stars, we show that a significant gap is left unexplored below the threshold that we determined for Lbs. Lower efficiencies exist in some OH Miras and in the OH SRs. We cannot discard the possibility of faint OH emission from certain Lbs, based on the same processes as encountered in those sources. We briefly discuss physical conditions allowing OH emission in the envelope, and the evolutionary stage of objects classified as Lb variables with respect to the AGB.	Target sources: SIMBAD Comments: Velocity resolution: 0.28 and 0.56 km/s Upper limit for non-detections: <0.2 Jy (3σ)

Abstract

Irregular variables of type Lb share many characteristics with asymptotic giant branch (AGB) stars such as Miras and semiregulars (SRs). Despite their large number, irregulars are poorly understood. Using the large Nan�ay radio telescope, we searched for 18-cm OH maser emission from these stars. We selected two samples of Lbs that present a noticeable circumstellar envelope. In the first one, 44 high-latitude objects with infrared colours of dusty mass-losing stars were observed in a wide-bandwidth velocity-search mode. In addition, 16 objects (including six from the first sample), in which other circumstellar molecular lines had recently been found, were observed with higher resolution and sensitivity. We did not detect any new OH maser emission from these samples down to 3sigma sensitivity limits ranging from 30 to 200 mJy. We derived upper limits for the efficiency of a typical pump using far-infrared photons. When compared with known OH masers in AGB stars, we show that a significant gap is left unexplored below the threshold that we determined for Lbs. Lower efficiencies exist in some OH Miras and in the OH SRs. We cannot discard the possibility of faint OH emission from certain Lbs, based on the same processes as encountered in those sources. We briefly discuss physical conditions allowing OH emission in the envelope, and the evolutionary stage of objects classified as Lb variables with respect to the AGB.

Target sources:
SIMBAD

Comments:
Velocity resolution: 0.28 and 0.56 km/s
Upper limit for non-detections: <0.2 Jy (3σ)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	F_peak	List	Detection	Class	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			OH	(Jy)		Yes/No
1	20 06 55.2	-27 13 29.8	14.7707	-27.6823	G14.771-27.682	V1943 Sgr	1.665 GHz;	0.096	ENG15	+H₂O -OH -SiO	EVOLVED	SIV04
2	20 06 55.2	-27 13 29.8	14.7707	-27.6823	G14.771-27.682	V1943 Sgr	1.667 GHz;	0.099	ENG15	+H₂O -OH -SiO	EVOLVED	SIV04
3	20 30 18.5	-04 45 16.7	40.2490	-24.1206	G40.249-24.121	TZ Aql	1.665 GHz;	0.039	ENG15	-CH₃OH II -OH	EVOLVED	SIV04
4	20 30 18.5	-04 45 16.7	40.2490	-24.1206	G40.249-24.121	TZ Aql	1.667 GHz;	0.060	ENG15	-CH₃OH II -OH	EVOLVED	SIV04
5	23 22 45.4	-10 49 0.1	66.6905	-63.5234	G66.689-63.523	SV Aqr	1.665 GHz;	0.033	ENG15	-OH	EVOLVED	SIV04
6	23 22 45.4	-10 49 0.1	66.6905	-63.5234	G66.689-63.523	SV Aqr	1.667 GHz;	0.042	ENG15	-OH	EVOLVED	SIV04
7	12 07 14.9	-06 45 56.1	283.8239	54.4585	G283.824+54.459	RW Vir	1.665 GHz;	0.036	ENG15	-OH	EVOLVED	SIV04
8	12 07 14.9	-06 45 56.1	283.8239	54.4585	G283.824+54.459	RW Vir	1.667 GHz;	0.036	ENG15	-OH	EVOLVED	SIV04
9	08 22 11.1	-25 37 54.7	246.0945	6.4440	G246.095+6.444	OT Pup	1.665 GHz;	0.057	ENG15	-H₂O -OH -SiO	EVOLVED	SIV04
10	08 22 11.1	-25 37 54.7	246.0945	6.4440	G246.095+6.444	OT Pup	1.667 GHz;	0.057	ENG15	-H₂O -OH -SiO	EVOLVED	SIV04
11	08 21 33.2	+04 57 30.2	218.9574	22.2801	G218.957+22.280	FZ Hya	1.665 GHz;	0.033	ENG15	-H₂O -OH	EVOLVED	SIV04
12	08 21 33.2	+04 57 30.2	218.9574	22.2801	G218.957+22.280	FZ Hya	1.667 GHz;	0.042	ENG15	-H₂O -OH	EVOLVED	SIV04
13	08 24 27.9	-08 31 12.7	231.7659	16.2587	G231.766+16.259	FK Hya	1.665 GHz;	0.042	ENG15	-OH	EVOLVED	SIV04
14	08 24 27.9	-08 31 12.7	231.7659	16.2587	G231.766+16.259	FK Hya	1.667 GHz;	0.039	ENG15	-OH	EVOLVED	SIV04
15	06 30 59.9	+27 27 7.6	186.1393	8.0401	G186.139+8.039	DW Gem	1.665 GHz;	0.057	ENG15	-H₂O -OH -SiO	EVOLVED	SIV04
16	06 30 59.9	+27 27 7.6	186.1393	8.0401	G186.139+8.039	DW Gem	1.667 GHz;	0.048	ENG15	-H₂O -OH -SiO	EVOLVED	SIV04
17	09 08 26.5	+13 13 13.6	216.2248	36.2928	G216.225+36.293	CW Cnc	1.665 GHz;	0.033	ENG15	-H₂O -OH	EVOLVED	SIV04
18	09 08 26.5	+13 13 13.6	216.2248	36.2928	G216.225+36.293	CW Cnc	1.667 GHz;	0.036	ENG15	-H₂O -OH	EVOLVED	SIV04
19	11 15 55.9	+75 08 34.6	130.7762	40.4972	G130.776+40.498	CS Dra	1.665 GHz;	0.078	ENG15	-H₂O -OH +SiO	EVOLVED	SIV04
20	11 15 55.9	+75 08 34.6	130.7762	40.4972	G130.776+40.498	CS Dra	1.667 GHz;	0.063	ENG15	-H₂O -OH +SiO	EVOLVED	SIV04
21	01 29 33.3	+46 39 33	129.7104	-15.7103	G129.711-15.710	CE And	1.665 GHz;	0.036	ENG15	+H₂O -OH	EVOLVED	SIV04
22	01 29 33.3	+46 39 33	129.7104	-15.7103	G129.711-15.710	CE And	1.667 GHz;	0.036	ENG15	+H₂O -OH	EVOLVED	SIV04
23	23 00 53.1	+46 30 37.5	103.8652	-12.2280	G103.865-12.228	BC And	1.665 GHz;	0.066	ENG15	-CH₃OH II -OH	EVOLVED	SIV04
24	23 00 53.1	+46 30 37.5	103.8652	-12.2280	G103.865-12.228	BC And	1.667 GHz;	0.063	ENG15	-CH₃OH II -OH	EVOLVED	SIV04
25	11 47 13.8	+43 28 15.9	157.2213	69.1335	G157.222+69.133	AZ UMa	1.665 GHz;	0.039	ENG15	+H₂O -OH -SiO	EVOLVED	SIV04
26	11 47 13.8	+43 28 15.9	157.2213	69.1335	G157.222+69.133	AZ UMa	1.667 GHz;	0.039	ENG15	+H₂O -OH -SiO	EVOLVED	SIV04
27	22 38 34.6	-14 02 14.5	49.1148	-56.4026	G49.115-56.403	AB Aqr	1.665 GHz;	0.054	ENG15	-OH	EVOLVED	SIV04
28	22 38 34.6	-14 02 14.5	49.1148	-56.4026	G49.115-56.403	AB Aqr	1.667 GHz;	0.054	ENG15	-OH	EVOLVED	SIV04
29	13 53 55.2	+17 16 50.8	1.8570	72.5311	G1.857+72.531	XZ Boo	1.665 GHz;	0.090	ENG15	-OH	EVOLVED	SIV04
30	13 53 55.2	+17 16 50.8	1.8570	72.5311	G1.857+72.531	XZ Boo	1.667 GHz;	0.087	ENG15	-OH	EVOLVED	SIV04
31	11 47 1.5	+58 14 17.7	138.4423	56.9081	G138.443+56.908	WW UMa	1.665 GHz;	0.132	ENG15	-OH -SiO	EVOLVED	SIV04
32	11 47 1.5	+58 14 17.7	138.4423	56.9081	G138.443+56.908	WW UMa	1.667 GHz;	0.117	ENG15	-OH -SiO	EVOLVED	SIV04
33	16 26 47.7	-02 37 01	11.9434	30.2499	G11.943+30.250	V707 Oph	1.665 GHz;	0.087	ENG15	-OH -SiO	EVOLVED	SIV04
34	16 26 47.7	-02 37 01	11.9434	30.2499	G11.943+30.250	V707 Oph	1.667 GHz;	0.063	ENG15	-OH -SiO	EVOLVED	SIV04
35	16 06 44.6	+48 42 24.2	76.3837	46.8241	G76.384+46.824	V649 Her	1.665 GHz;	0.087	ENG15	-OH +SiO	EVOLVED	SIV04
36	16 06 44.6	+48 42 24.2	76.3837	46.8241	G76.384+46.824	V649 Her	1.667 GHz;	0.063	ENG15	-OH +SiO	EVOLVED	SIV04
37	17 06 47.6	+21 06 18.3	41.9511	32.0232	G41.951+32.023	V456 Her	1.665 GHz;	0.105	ENG15	-OH	EVOLVED	SIV04
38	17 06 47.6	+21 06 18.3	41.9511	32.0232	G41.951+32.023	V456 Her	1.667 GHz;	0.069	ENG15	-OH	EVOLVED	SIV04
39	03 01 34.7	+21 48 12.2	158.9242	-31.8217	G158.924-31.822	UZ Ari	1.665 GHz;	0.108	ENG15	+H₂O +OH	EVOLVED	SIV04
40	03 01 34.7	+21 48 12.2	158.9242	-31.8217	G158.924-31.822	UZ Ari	1.667 GHz;	0.090	ENG15	+H₂O +OH	EVOLVED	SIV04
41	10 29 21.6	+23 03 43.6	212.1644	57.6835	G212.164+57.684	UY Leo	1.665 GHz;	0.096	ENG15	-OH	EVOLVED	SIV04
42	10 29 21.6	+23 03 43.6	212.1644	57.6835	G212.164+57.684	UY Leo	1.667 GHz;	0.099	ENG15	-OH	EVOLVED	SIV04
43	13 12 1.7	+56 22 48.9	117.1390	60.5158	G117.140+60.516	UW UMa	1.665 GHz;	0.126	ENG15	-OH -SiO	EVOLVED	SIV04
44	13 12 1.7	+56 22 48.9	117.1390	60.5158	G117.140+60.516	UW UMa	1.667 GHz;	0.123	ENG15	-OH -SiO	EVOLVED	SIV04
45	08 38 46.7	+21 09 34	204.1005	32.6339	G204.101+32.634	UV Cnc	1.665 GHz;	0.099	ENG15	-OH	EVOLVED	SIV04
46	08 38 46.7	+21 09 34	204.1005	32.6339	G204.101+32.634	UV Cnc	1.667 GHz;	0.102	ENG15	-OH	EVOLVED	SIV04
47	17 37 0.1	+57 44 25.3	86.0813	32.4922	G86.081+32.492	TY Dra	1.665 GHz;	0.084	ENG15	-H₂O -OH -SiO	EVOLVED	SIV04
48	17 37 0.1	+57 44 25.3	86.0813	32.4922	G86.081+32.492	TY Dra	1.667 GHz;	0.084	ENG15	-H₂O -OH -SiO	EVOLVED	SIV04
49	00 39 46	+14 12 1.2	118.6546	-48.5745	G118.655-48.574	TW Psc	1.665 GHz;	0.090	ENG15	-OH	EVOLVED	SIV04
50	00 39 46	+14 12 1.2	118.6546	-48.5745	G118.655-48.574	TW Psc	1.667 GHz;	0.099	ENG15	-OH	EVOLVED	SIV04
51	12 59 21.2	+43 53 15.6	118.0028	73.1648	G118.003+73.165	TW CVn	1.665 GHz;	0.108	ENG15	-OH	EVOLVED	SIV04
52	12 59 21.2	+43 53 15.6	118.0028	73.1648	G118.003+73.165	TW CVn	1.667 GHz;	0.099	ENG15	-OH	EVOLVED	SIV04
53	13 15 11.7	+42 16 00	106.6966	74.1044	G106.695+74.104	TV CVn	1.665 GHz;	0.093	ENG15	-OH -SiO	EVOLVED	SIV04
54	13 15 11.7	+42 16 00	106.6966	74.1044	G106.695+74.104	TV CVn	1.667 GHz;	0.099	ENG15	-OH -SiO	EVOLVED	SIV04
55	12 27 57.9	+18 48 8.4	268.7556	80.0787	G268.750+80.079	TV Com	1.665 GHz;	0.102	ENG15	-OH -SiO	EVOLVED	SIV04
56	12 27 57.9	+18 48 8.4	268.7556	80.0787	G268.750+80.079	TV Com	1.667 GHz;	0.093	ENG15	-OH -SiO	EVOLVED	SIV04
57	11 15 10.7	-01 23 15.7	259.9731	53.2595	G259.973+53.260	TT Leo	1.665 GHz;	0.084	ENG15	-OH	EVOLVED	SIV04
58	11 15 10.7	-01 23 15.7	259.9731	53.2595	G259.973+53.260	TT Leo	1.667 GHz;	0.078	ENG15	-OH	EVOLVED	SIV04
59	05 08 47	-34 31 1.5	237.6322	-35.1678	G237.632-35.168	SZ Col	1.665 GHz;	0.141	ENG15	-OH	EVOLVED	SIV04
60	05 08 47	-34 31 1.5	237.6322	-35.1678	G237.632-35.168	SZ Col	1.667 GHz;	0.135	ENG15	-OH	EVOLVED	SIV04
61	01 38 30.1	+01 21 40.3	146.4952	-59.3403	G146.495-59.340	SW Cet	1.665 GHz;	0.090	ENG15	-OH	EVOLVED	SIV04
62	01 38 30.1	+01 21 40.3	146.4952	-59.3403	G146.495-59.340	SW Cet	1.667 GHz;	0.099	ENG15	-OH	EVOLVED	SIV04
63	08 05 55.5	+51 41 13.6	166.9472	32.2738	G166.947+32.274	SS Lyn	1.665 GHz;	0.156	ENG15	-OH	EVOLVED	SIV04
64	08 05 55.5	+51 41 13.6	166.9472	32.2738	G166.947+32.274	SS Lyn	1.667 GHz;	0.156	ENG15	-OH	EVOLVED	SIV04
65	02 02 29.4	+16 16 17	146.6617	-43.3025	G146.662-43.302	RY Ari	1.665 GHz;	0.117	ENG15	-H₂O -OH	EVOLVED	SIV04
66	02 02 29.4	+16 16 17	146.6617	-43.3025	G146.662-43.302	RY Ari	1.667 GHz;	0.120	ENG15	-H₂O -OH	EVOLVED	SIV04
67	21 12 46.3	-14 23 33	35.4114	-37.7269	G35.411-37.727	RX Aqr	1.665 GHz;	0.084	ENG15	+H₂O -OH	EVOLVED	SIV04
68	21 12 46.3	-14 23 33	35.4114	-37.7269	G35.411-37.727	RX Aqr	1.667 GHz;	0.093	ENG15	+H₂O -OH	EVOLVED	SIV04
69	04 06 50	-07 40 24	199.4769	-39.8884	G199.477-39.888	RV Eri	1.665 GHz;	0.069	ENG15	-OH	EVOLVED	SIV04
70	04 06 50	-07 40 24	199.4769	-39.8884	G199.477-39.888	RV Eri	1.667 GHz;	0.063	ENG15	-OH	EVOLVED	SIV04
71	10 53 7.6	+24 21 41	212.1855	63.2760	G212.186+63.276	RU Leo	1.665 GHz;	0.084	ENG15	-OH	EVOLVED	SIV04
72	10 53 7.6	+24 21 41	212.1855	63.2760	G212.186+63.276	RU Leo	1.667 GHz;	0.096	ENG15	-OH	EVOLVED	SIV04
73	09 28 33.8	+36 09 38.6	187.8835	46.3845	G187.884+46.385	RS LMi	1.665 GHz;	0.114	ENG15	-OH	EVOLVED	SIV04
74	09 28 33.8	+36 09 38.6	187.8835	46.3845	G187.884+46.385	RS LMi	1.667 GHz;	0.114	ENG15	-OH	EVOLVED	SIV04
75	09 54 53.6	+05 11 51	232.4102	42.6420	G232.410+42.642	RR Sex	1.665 GHz;	0.102	ENG15	-OH	EVOLVED	SIV04
76	09 54 53.6	+05 11 51	232.4102	42.6420	G232.410+42.642	RR Sex	1.667 GHz;	0.099	ENG15	-OH	EVOLVED	SIV04
77	12 24 29	-26 15 12	295.4361	36.2258	G295.436+36.226	KV Hya	1.665 GHz;	0.087	ENG15	-OH		SIV04
78	12 24 29	-26 15 12	295.4361	36.2258	G295.436+36.226	KV Hya	1.667 GHz;	0.084	ENG15	-OH		SIV04
79	15 54 29.2	-10 52 29.4	358.6121	31.5816	G358.613+31.579	GP Lib	1.665 GHz;	0.060	ENG15	-OH -SiO	EVOLVED	SIV04
80	15 54 29.2	-10 52 29.4	358.6121	31.5816	G358.613+31.579	GP Lib	1.667 GHz;	0.060	ENG15	-OH -SiO	EVOLVED	SIV04
81	16 31 56.4	+38 51 30	62.0163	43.0272	G62.016+43.027	GN Her	1.665 GHz;	0.111	ENG15	-OH	EVOLVED	SIV04
82	16 31 56.4	+38 51 30	62.0163	43.0272	G62.016+43.027	GN Her	1.667 GHz;	0.093	ENG15	-OH	EVOLVED	SIV04
83	22 30 28.3	+13 06 18.2	78.0596	-37.1970	G78.060-37.197	GM Peg	1.665 GHz;	0.105	ENG15	-OH	EVOLVED	SIV04
84	22 30 28.3	+13 06 18.2	78.0596	-37.1970	G78.060-37.197	GM Peg	1.667 GHz;	0.093	ENG15	-OH	EVOLVED	SIV04
85	21 48 45.9	+07 12 20	64.0123	-34.0440	G64.012-34.044	EV Peg	1.665 GHz;	0.096	ENG15	-OH	EVOLVED	SIV04
86	21 48 45.9	+07 12 20	64.0123	-34.0440	G64.012-34.044	EV Peg	1.667 GHz;	0.090	ENG15	-OH	EVOLVED	SIV04
87	22 33 03	+20 46 48	84.4025	-31.5456	G84.402-31.546	EN Peg	1.665 GHz;	0.093	ENG15	-OH		SIV04
88	22 33 03	+20 46 48	84.4025	-31.5456	G84.402-31.546	EN Peg	1.667 GHz;	0.099	ENG15	-OH		SIV04
89	08 54 39	+06 16 48	221.9008	30.1918	G221.901+30.192	CV Hya	1.665 GHz;	0.072	ENG15	-OH	EVOLVED	SIV04
90	08 54 39	+06 16 48	221.9008	30.1918	G221.901+30.192	CV Hya	1.667 GHz;	0.072	ENG15	-OH	EVOLVED	SIV04
91	11 41 9.3	+75 28 21.5	128.6784	40.8618	G128.678+40.862	CT Dra	1.665 GHz;	0.192	ENG15	-OH	EVOLVED	SIV04
92	11 41 9.3	+75 28 21.5	128.6784	40.8618	G128.678+40.862	CT Dra	1.667 GHz;	0.162	ENG15	-OH	EVOLVED	SIV04
93	12 33 8.3	+07 15 0.8	289.7780	69.6532	G289.778+69.653	CI Vir	1.665 GHz;	0.090	ENG15	-OH	EVOLVED	SIV04
94	12 33 8.3	+07 15 0.8	289.7780	69.6532	G289.778+69.653	CI Vir	1.667 GHz;	0.090	ENG15	-OH	EVOLVED	SIV04
95	12 20 21.4	-09 00 0.1	290.0830	53.0946	G290.083+53.095	CH Vir	1.665 GHz;	0.078	ENG15	-OH	EVOLVED	SIV04
96	12 20 21.4	-09 00 0.1	290.0830	53.0946	G290.083+53.095	CH Vir	1.667 GHz;	0.069	ENG15	-OH	EVOLVED	SIV04
97	04 19 57.6	-18 43 22	214.5084	-41.5894	G214.508-41.589	AV Eri	1.665 GHz;	0.066	ENG15	-OH	EVOLVED	SIV04
98	04 19 57.6	-18 43 22	214.5084	-41.5894	G214.508-41.589	AV Eri	1.667 GHz;	0.063	ENG15	-OH	EVOLVED	SIV04
99	11 40 28.6	+11 11 42.6	253.2045	66.9359	G253.204+66.936	AI Leo	1.665 GHz;	0.084	ENG15	-OH	EVOLVED	SIV04
100	11 40 28.6	+11 11 42.6	253.2045	66.9359	G253.204+66.936	AI Leo	1.667 GHz;	0.090	ENG15	-OH	EVOLVED	SIV04
101	23 44 4.6	+00 22 54	89.7107	-58.0776	G89.711-58.078	AD Psc	1.665 GHz;	0.090	ENG15	-OH	GALAXY	SIV04
102	23 44 4.6	+00 22 54	89.7107	-58.0776	G89.711-58.078	AD Psc	1.667 GHz;	0.087	ENG15	-OH	GALAXY	SIV04
103	23 00 10.8	-00 22 51.1	73.3512	-52.2020	G73.351-52.202	AB Psc	1.665 GHz;	0.111	ENG15	-OH	EVOLVED	SIV04
104	23 00 10.8	-00 22 51.1	73.3512	-52.2020	G73.351-52.202	AB Psc	1.667 GHz;	0.114	ENG15	-OH	EVOLVED	SIV04
105	06 01 47	-02 21 13.2	209.3321	-12.1155	G209.332-12.116	V352 Ori	1.667 GHz;	0.048	ENG15	-H₂O -OH	EVOLVED	SIV04
106	06 01 47	-02 21 13.2	209.3321	-12.1155	G209.332-12.116	V352 Ori	1.665 GHz;	0.036	ENG15	-H₂O -OH	EVOLVED	SIV04
107	20 10 29.8	-01 37 40.8	40.7312	-18.2879	G40.731-18.288	V584 Aql	1.667 GHz;	0.084	ENG15	-H₂O -OH	EVOLVED	SIV04
108	20 10 29.8	-01 37 40.8	40.7312	-18.2879	G40.731-18.288	V584 Aql	1.665 GHz;	0.072	ENG15	-H₂O -OH	EVOLVED	SIV04

Distribution of sources in all sky (l,b)

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Distribution of sources in IRAS color-color diagram

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Original color diagram is taken form van der Veen & Habing (1987)

Type	Description
I	Oxygen-rich non-variable stars without circumstellar shells
II	Variable stars with "young" O-rich circumstellar shells
IIIa	Variable stars with more evolved O-rich circumstellar shells
IIIb	Variable stars with thick O-rich circumstellar shells
IV	Variable stars with very thick O-rich circumstellar shells
V	Planetary nebulae and non- variable stars with very cool circumstellar shells
VIa	Variable stars with relatively cold dust at large distances; a significant part of the stars is carbon-rich
VIb	Variable stars with relatively hot dust close to the star and relatively cold dust at large distances; Some of the objects have proven to be O-rich
VII	Variable stars with more evolved C-rich circumstellar shells
VIII	Different sort of objects

Distribution of the detection velocities versus galactic longitude from SIV04

Tip: Use "Box select" or "Lasso select" to display velocity-selected sources in Aladin all-sky view

Tip: Click on some source to look at the different surveys. You must select some surveys in previous page at "View images"

Longitude-Velocity Map is taken form Dame, Hartmann & Thaddeus (2001)

Distribution of sources from SIV04 in (l,b) histograms

DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

select MAX(oh_data_all.ra_hms) as ra_hms,MAX(oh_data_all.dec_dms) as dec_dms,MAX(oh_data_all.source_name) as source_name,MAX(oh_data_all.ra) as ra,MAX(oh_data_all.dec) as dec,MAX(oh_data_all.l) as l,MAX(oh_data_all.b) as b,MAX(oh_data_all.grp) as grp,MAX(oh_data_all.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.freq) as freq,MAX(oh_data_all.vrange) as vrange,MAX(oh_data_all.vpeak) as vpeak,MAX(oh_data_all.peak) as peak,MAX(oh_data_all.fwhm) as fwhm,MAX(oh_data_all.int) as int,MAX(oh_data_all.rms) as rms,MAX(oh_data_all.units) as units,MAX(oh_data_all.units_rms) as units_rms,MAX(oh_data_all.date_txt) as date_txt,MAX(oh_data_all.telescope_ref) as telescope_ref,MAX(oh_data_all.telescope_conf) as telescope_conf,MAX(oh_data_all.v_step) as v_step,MAX(oh_data_all.beam) as beam,MAX(oh_data_all.beam_maj) as beam_maj,MAX(oh_data_all.beam_min) as beam_min,MAX(oh_data_all.beam_pa) as beam_pa,MAX(oh_data_all.ref) as ref,MAX(oh_data_all.list_ref) as list_ref,MAX(oh_data_all.ascii) as ascii,MAX(oh_data_all.url) as url,MAX(oh_data_all.image) as image,MAX(oh_data_all.image2) as image2,MAX(oh_data_all.image3) as image3,MAX(oh_data_all.descr) as descr,MAX(oh_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(oh_data_all.dist) as dist,1 as dist_parallax,MAX(oh_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM oh_data_all  LEFT JOIN all_objects_withmet ON oh_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON oh_data_all.line=transitions."Line"  WHERE ref ilike 'SIV04' AND detected=true AND hide=false GROUP BY ref

select oh_data_all.ra_hms,oh_data_all.dec_dms,oh_data_all.source_name,oh_data_all.ra,oh_data_all.dec,oh_data_all.l,oh_data_all.b,oh_data_all.grp,oh_data_all.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.freq,oh_data_all.vrange,oh_data_all.vpeak,oh_data_all.peak,oh_data_all.fwhm,oh_data_all.int,oh_data_all.rms,oh_data_all.units,oh_data_all.units_rms,oh_data_all.date_txt,oh_data_all.telescope_ref,oh_data_all.telescope_conf,oh_data_all.v_step,oh_data_all.beam,oh_data_all.beam_maj,oh_data_all.beam_min,oh_data_all.beam_pa,oh_data_all.ref,oh_data_all.list_ref,oh_data_all.ascii,oh_data_all.url,oh_data_all.image,oh_data_all.image2,oh_data_all.image3,oh_data_all.descr,oh_data_all.id,oh_data_all.mjy_flag,oh_data_all.rms_mjy_flag,oh_data_all.dist,oh_data_all.dist_parallax,oh_data_all.date_txt,line_det,type,simbad_types_cat FROM oh_data_all   LEFT JOIN all_objects_withmet ON oh_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON oh_data_all.line=transitions."Line"  WHERE ref ilike 'SIV04' AND detected=true AND hide=false ORDER BY detected DESC,id