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• Target type: pAGB_PN
  

• Abstract

  We present the results of 22 GHz H2O maser observations of a sample of 85 post-asymptotic giant branch (post-AGB) candidate stars, selected on the basis of their OH 1612 MHz maser and far-infrared properties. All sources were observed with the Tidbinbilla 70 m radio telescope, and 21 detections were made 86 GHz SiO Mopra observations of a subset of the sample are also presented. Of the 21 H2O detections, 15 are from sources that are likely to be massive AGB stars and most of these show typical, regular H2O maser profiles. In contrast, nearly all the detections of more evolved stars exhibited high-velocity H2O maser emission. Of the five sources seen, v223 (W43A, IRAS 18450-0148) is a well-known water-fountain source that belongs to a small group of post-AGB stars with highly collimated, high-velocity H2O maser emission. A second source in our sample, v270 (IRAS 18596+0315), is also known to have high-velocity emission. We report the discovery of similar emission from a further three sources, d46 (IRAS 15445-5449), d62 (IRAS 15544-5332), and b292 (IRAS 18043-2116). The source d46 is an evolved post-AGB star with highly unusual maser properties. The H2O maser emission from d62 is probably associated with a massive star. The source b292 is a young post-AGB star that is highly likely to be a water-fountain source, with masers detected over a velocity range of 210 km s-1. eprintid: arXiv:astro-ph/0702086

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Spectra	Line	Vrange	Vpeak	Fpeak	∫F dv	Telescope	Vstep	RMS	Detection	Class	Dist. (parallax)
	(J2000)	(J2000)	(deg.)	(deg.)				H2O	(km/s)	(km/s)	(Jy)	(Jy*km/s)		(km/s)	(Jy)	Yes/No		(kpc)
1	19 02 6.3	+03 20 15.5	37.1183	-0.8473	G37.118-0.847	IRAS 18596+0315	Spectra	22 GHz;	60.0;119.0	61.6	3.5	45.2	TID	0.25	0.130	+H2O -CH3OH I -CH3OH II +OH +SiO	EVOLVED
2	19 01 20	+04 32 31.2	38.1013	-0.1253	G38.101-0.125	IRAS 18588+0428	Spectra	22 GHz;	29.0;74.0	32.1	7.6	445	TID	0.25	0.130	+H2O +OH +SiO	SFR_MIXED
3	18 51 26.3	-01 03 52.2	31.9845	-0.4853	G31.984-0.485	IRAS 18488-0107	Spectra	22 GHz;	60.0;66.0	63.6	0.6	11.1	TID	0.25	0.130	+H2O -CH3OH II +OH +SiO	EVOLVED
4	18 48 41.9	-02 50 29.2	30.0909	-0.6865	G30.091-0.686	IRAS 18460-0254	Spectra	22 GHz;	83.0;90.0	85.0	0.4	5.2	TID	0.25	0.130	+H2O -CH3OH II +OH +SiO	SFR_MIXED
5	18 47 41.1	-01 45 11.8	30.9438	0.0351	G30.944+0.035	IRAS 18450-0148	Spectra	22 GHz;	-60.0;127.0	122.7	60.2	1409.2	TID	0.25	0.130	+H2O -CH3OH II +OH +SiO	SFR_MIXED
6	18 46 5.8	-01 59 17.6	30.5536	0.2813	G30.554+0.281	IRAS 18434-0202	Spectra	22 GHz;	17.0;59.0	22.9	2.1	60.8	TID	0.25	0.130	+H2O +OH	EVOLVED
7	18 35 29.2	-07 13 11	24.6925	0.2347	G24.693+0.235	IRAS 18327-0715	Spectra	22 GHz;	23.0;66.0	29.0	9.3	370.8	TID	0.25	0.130	+H2O -CH3OH II +OH +SiO	SFR_MIXED
8	18 34 11.3	-08 58 2.6	22.9932	-0.2848	G22.993-0.285	IRAS 18314-0900	Spectra	22 GHz;	19.0;25.0	20.6	0.3	3.7	TID	0.25	0.130	+H2O -CH3OH II +OH	SFR_MIXED
	18 34 11.3	-08 58 2.6	22.9932	-0.2848	G22.993-0.285	IRAS 18314-0900		22 GHz;	19.0;25.0	20.6	0.3	3.7	TID	0.25	0.130	+H2O -CH3OH II +OH	SFR_MIXED
10	18 28 30.9	-09 58 14.3	21.4566	0.4912	G21.457+0.491	IRAS 18257-1000		22 GHz;	100.0;107.0	101.9	0.3	8.2	TID	0.25	0.130	+H2O +OH +SiO	EVOLVED
11	16 35 14.9	-50 24 15.2	334.8299	-1.9355	G334.830-1.935	IRAS 16314-5018	Spectra	22 GHz;	-65.0;-62.0	-63.6	0.5	6.7	TID	0.25	0.130	+H2O +OH	EVOLVED
12	18 13 20.2	-17 37 17.3	12.9734	0.1333	G12.973+0.133	IRAS 18103-1738	Spectra	22 GHz;	-3.0;35.0	32.5	0.9	25.2	TID	0.25	0.130	+H2O +OH	EVOLVED
13	17 42 30.5	-30 22 08	358.4255	-0.1747	G358.426-0.175	IRAS 17392-3020	Spectra	22 GHz;	-18.0;21.0	15.7	1.3	35.6	TID	0.25	0.130	+H2O +OH	SFR_MIXED
14	18 07 20.9	-21 16 10.9	9.0970	-0.3920	G9.097-0.392	IRAS 18043-2116	Spectra	22 GHz;	-20.0;184.0	100.2	25.3	378.3	TID	0.25	0.130	+H2O +OH	EVOLVED
15	17 22 18.8	-38 41 40.1	349.1836	-1.2432	G349.184-1.243	IRAS 17188-3838	Spectra	22 GHz;	-90.0;-57.0	-87.4	0.6	14.8	TID	0.25	0.130	+H2O +OH	EVOLVED
16	15 49 11.4	-55 08 51.8	326.5180	-0.6332	G326.518-0.633	IRAS 15452-5459	Spectra	22 GHz;	-82.0;-32.0	-41.4	5	252.2	TID	0.25	0.130	+H2O +OH	EVOLVED
	15 49 11.4	-55 08 51.8	326.5180	-0.6332	G326.518-0.633	IRAS 15452-5459	Spectra	22 GHz;	-82.0;-33.0	-38.3	2.3	81.6	TID	0.25	0.130	+H2O +OH	EVOLVED
18	15 58 18.8	-53 40 40.2	328.4769	-0.3424	G328.477-0.342	IRAS 15544-5332	Spectra	22 GHz;	-75.0;-72.0	-73.6	0.9	3.7	TID	0.25	0.130	+H2O +OH	EVOLVED
19	16 35 14.9	-50 24 15.2	334.8299	-1.9355	G334.830-1.935	IRAS 16314-5018		22 GHz;	-65.0;-62.0	-63.6	0.5	6.7	TID	0.25	0.130	+H2O +OH	EVOLVED
20	18 08 16.4	-20 16 11.5	10.0759	-0.0950	G10.076-0.095	IRAS 18052-2016	Spectra	22 GHz;	14.0;43.0	26.4	1.9	45.2	TID	0.25	0.130	+H2O +OH	EVOLVED
21	17 12 22.8	-42 25 9.8	345.0522	-1.8550	G345.052-1.855	IRAS 17088-4221	Spectra	22 GHz;	-5.0;16.0	-2.2	46	1038.4	TID	0.25	0.130	+H2O +OH	EVOLVED
22	17 22 42.6	-35 49 31.6	351.5923	0.3177	G351.592+0.318	IRAS 17193-3546	Spectra	22 GHz;	11.0;22.0	21.2	1	13.4	TID	0.25	0.130	+H2O +OH	EVOLVED
23	17 03 56.2	-41 23 59.2	344.9292	0.0137	G344.929+0.014	IRAS 17004-4119	Spectra	22 GHz;	-25.0;-16.0	-21.7	12.1	222.5	TID	0.25	0.130	+H2O +OH	SFR_MIXED
24	15 49 11.4	-55 08 51.8	326.5180	-0.6332	G326.518-0.633	IRAS 15452-5459		22 GHz;	-83.0;-32.0	-41.4	6.3	274.4	TID	0.25	0.130	+H2O +OH	EVOLVED
25	15 48 19.5	-54 58 21.5	326.5299	-0.4191	G326.530-0.419	IRAS 15445-5449	Spectra	22 GHz;	-145.0;-35.0	-136.9	9.3	459.9	TID	0.25	0.130	+H2O +OH	SFR_MIXED
	15 48 19.5	-54 58 21.5	326.5299	-0.4191	G326.530-0.419	IRAS 15445-5449	Spectra	22 GHz;	-145.0;-54.0	-121.0	9.3	489.5	TID	0.25	0.130	+H2O +OH	SFR_MIXED

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Line	Fpeak	Date	Telescope	Vstep	RMS	Detection	Class
	(J2000)	(J2000)	(deg.)	(deg.)			H2O	(Jy)			(km/s)	(Jy)	Yes/No
1	17 19 42.1	-37 54 55.2	349.5318	-0.3781	G349.532-0.378	IRAS 17162-3751	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
2	17 20 15	-37 39 34.3	349.8038	-0.3208	G349.804-0.321	IRAS 17168-3736	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	SFR_MIXED
3	17 24 7.3	-36 35 40.5	351.1184	-0.3516	G351.118-0.352	IRAS 17207-3632	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
4	17 26 7.3	-36 26 15.1	351.4741	-0.5962	G351.474-0.596	IRAS 17227-3623	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
5	17 45 46.7	-28 05 28.5	0.7393	0.4105	G0.739+0.410	IRAS 17426-2804	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+OH
6	17 42 32.1	-27 28 28	0.8894	1.3445	G0.892+1.342	IRAS 17393-2727	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+OH
7	18 50 59.5	+06 45 57.5	38.9091	3.1782	G38.909+3.178	IRAS 18485+0642	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH II +OH	EVOLVED
8	19 05 2.2	+00 48 51.2	35.2086	-2.6531	G35.209-2.653	IRAS 19024+0044	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
9	18 45 52.4	-01 46 42.8	30.7147	0.4266	G30.715+0.427	IRAS 18432-0149	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+H2O -CH3OH II +OH +SiO	SFR_MIXED
10	18 49 19.4	-02 34 49.9	30.3943	-0.7065	G30.394-0.706	IRAS 18467-0238	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH II +OH	SFR_MIXED
11	18 41 35.9	-05 58 51	26.4896	-0.5455	G26.490-0.546	IRAS 18389-0601	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH II +OH	EVOLVED
12	18 38 15.4	-07 09 54.2	25.0568	-0.3504	G25.057-0.350	IRAS 18355-0712	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I +OH	EVOLVED
13	18 13 3.1	-19 14 18.7	11.5217	-0.5823	G11.522-0.582	IRAS 18100-1915	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH +SiO	EVOLVED
14	17 49 20.9	-27 41 54.1	1.4838	-0.0612	G1.4838-0.0612	IRAS 17461-2741	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	SFR_MIXED
15	17 51 12.1	-30 33 39.8	359.2329	-1.8762	G359.233-1.876	IRAS 17479-3032	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+OH	EVOLVED
16	17 51 22.8	-25 01 52.7	4.0072	0.9152	G4.007+0.915	IRAS 17482-2501	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+OH	EVOLVED
17	17 53 50.7	-29 55 28.3	0.0717	-2.0443	G0.072-2.044	IRAS 17506-2955	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I +OH	EVOLVED
18	17 57 33.6	-31 03 2.1	359.4991	-3.3018	G359.499-3.302	IRAS 17543-3102	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
19	17 57 58.3	-27 53 19.9	2.2865	-1.8014	G2.287-1.801	IRAS 17548-2753	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I +OH	EVOLVED
20	17 58 05	-21 21 7.1	7.9612	1.4448	G7.961+1.445	IRAS 17550-2120	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I +OH	EVOLVED
21	17 59 05	-20 27 23.9	8.8542	1.6887	G8.854+1.689	IRAS 17560-2027	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I +OH	EVOLVED
22	18 00 49.5	-26 53 12.5	3.4715	-1.8528	G3.472-1.853	IRAS 17576-2653	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
23	18 01 21.5	-26 19 36.8	4.0174	-1.6795	G4.017-1.679	IRAS 17582-2619	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
24	18 08 12.8	-24 14 36.7	6.5938	-2.0109	G6.594-2.011	IRAS 18051-2415	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I +OH	EVOLVED
25	18 10 4.8	-23 32 9.8	7.4199	-2.0424	G7.420-2.042	IRAS 18070-2332	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
26	18 10 38.7	-18 52 58.1	11.5600	0.0875	G11.560+0.087	IRAS 18076-1853	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH II +OH	EVOLVED
27	18 11 34.1	-14 39 54.3	15.3637	1.9248	G15.364+1.925	IRAS 18087-1440	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I +OH	EVOLVED
28	17 42 15.6	-28 10 36.4	0.2601	1.0264	G0.260+1.026	IRAS 17390-2809	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
29	17 41 52.3	-33 33 40.3	355.6409	-1.7425	G355.640-1.742	IRAS 17385-3332	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
30	17 40 23.1	-27 49 11.4	0.3444	1.5664	G0.344+1.566	IRAS 17371-2747	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
31	17 40 20.2	-33 59 13.4	355.1106	-1.6970	G355.110-1.697	IRAS 17370-3357	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+OH	EVOLVED
32	17 28 55.8	-33 00 41.9	354.6419	0.8302	G354.642+0.830	IRAS 17256-3258	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
33	17 26 18.8	-33 51 20.8	353.6367	0.8146	G353.637+0.815	IRAS 17230-3348	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
34	17 23 57.4	-35 58 50.3	351.6069	0.0218	G351.607+0.022	IRAS 17205-3556	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
35	15 37 31.8	-52 12 13.2	326.9324	2.7539	G326.932+2.754	IRAS 15338-5202	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
36	15 40 38.3	-54 30 18.6	325.9359	0.6279	G325.936+0.628	IRAS 15367-5420	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
37	15 55 20.7	-53 32 45.1	328.2250	0.0422	G328.225+0.042	IRAS 15514-5323	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
38	16 24 33.9	-47 21 29.6	335.8319	1.4344	G335.832+1.434	IRAS 16209-4714	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
39	16 40 55.8	-48 13 58.3	337.0646	-1.1728	G337.065-1.173	IRAS 16372-4808	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
40	16 54 31	-48 15 21.2	338.5074	-2.9154	G338.507-2.915	IRAS 16507-4810	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
41	17 13 05	-36 27 54.3	349.9488	1.5366	G349.949+1.537	IRAS 17097-3624	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
42	17 13 44.3	-37 06 11	349.5089	1.0562	G349.509+1.055	IRAS 17103-3702	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH II +OH	EVOLVED
43	18 44 41.7	-05 09 17	27.5766	-0.8532	G27.576-0.853	IRAS 18420-0512	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH II +OH	EVOLVED
44	18 38 50.5	-06 44 49.8	25.4947	-0.2878	G25.495-0.288	IRAS 18361-0647	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I -CH3OH II +OH	SFR_MIXED
45	18 36 58	-06 53 25.1	25.1539	0.0601	G25.156+0.060	IRAS 18342-0655	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I -CH3OH II +OH	SFR_MIXED
46	18 33 49.6	-08 04 1.4	23.7509	0.2096	G23.751+0.210	IRAS 18310-0806	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
47	18 30 30.7	-14 28 57.8	17.6839	-2.0323	G17.684-2.032	IRAS 18276-1431	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+H2O +OH +SiO	EVOLVED
48	18 28 30.8	-10 50 53	20.6794	0.0841	G20.679+0.084	IRAS 18257-1052	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH II +OH	EVOLVED
49	18 27 23.8	-10 30 21.7	20.8545	0.4862	G20.854+0.486	IRAS 18246-1032	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH II +OH	EVOLVED
50	18 21 6.9	-15 03 22.1	16.1170	-0.2906	G16.117-0.291	IRAS 18182-1504	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+H2O -CH3OH I +CH3OH II +OH +SiO	SFR_MIXED
51	18 12 20.4	-23 46 57	7.4524	-2.6147	G7.450-2.611	IRAS 18092-2347	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
52	17 43 38	-27 14 44.3	1.2123	1.2571	G1.212+1.257	IRAS 17404-2713	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+OH	EVOLVED
53	17 39 57.5	-31 35 57.3	357.0923	-0.3619	G357.092-0.362	IRAS 17367-3134	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
54	17 39 7.7	-29 04 2.6	359.1405	1.1372	G359.140+1.137	IRAS 17359-2902	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH I +OH	EVOLVED
55	17 34 53.3	-27 45 11.2	359.7499	2.6291	G359.750+2.629	IRAS 17317-2743	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O -CH3OH II +OH	EVOLVED
56	17 34 20.8	-34 34 55.4	353.9446	-0.9716	G353.945-0.972	IRAS 17310-3432	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
57	17 32 39.1	-33 04 15.9	355.0210	0.1458	G355.021+0.146	IRAS 17293-3302	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
58	17 28 4.6	-39 53 44.2	348.8135	-2.8399	G348.813-2.840	IRAS 17245-3951	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
59	17 18 19.9	-32 27 22	353.8437	2.9840	G353.844+2.984	IRAS 17150-3224	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
60	17 18 34.8	-38 48 57.4	348.6682	-0.7151	G348.668-0.715	IRAS 17151-3845	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
61	18 16 25.7	-14 55 17.2	15.7001	0.7704	G15.701+0.770	IRAS 18135-1456	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	+H2O -CH3OH I -CH3OH II +OH +SiO	EVOLVED
62	17 44 39.8	-31 10 5.4	357.9878	-0.9880	G357.988-0.988	IRAS 17414-3108	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	SFR_MIXED
63	17 19 40.8	-32 29 51.7	353.9727	2.7272	G353.973+2.727	IRAS 17164-3226	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED
64	14 38 05	-62 24 46.8	314.9330	-2.0525	G314.933-2.052	IRAS 14341-6211	22 GHz;	0.39	2004-01-01	TID	0.25	0.130	-H2O +OH	EVOLVED

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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