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• Target type: star
  Transitions: H2O_22,H2O_321,H2O_325
  

• Abstract

  Near-simultaneous observations of circumstellar 22-, 321- and 325-GHz water masers have been made at four epochs between 1992 March 1 and 1993 April 17. All nine sources studied have varied significantly, typically by factors of 2 or more, in all lines, and there have been major changes of profile shape in many cases. The 321-GHz line is generally the most variable, having the largest amplitudes of variation and shortest time-scales. Time-scales to vary by a factor of 2 were as short as 3 weeks. The variations in the 22-, 321- and 325-GHz masers are not particularly well correlated: in some cases they are completely anticorrelated. The variability data are presented in detail, and their implications for the H_2O maser excitation are briefly discussed.

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Descr.	Line	Vrange	Fpeak	Telescope	Detection	Class	Dist. (parallax)	Date
	(J2000)	(J2000)	(deg.)	(deg.)				H2O	(km/s)	(Jy)		Yes/No		(kpc)
1	05 55 49	+20 10 30	188.7150	-2.4928	G188.715-2.492	U Ori		22 GHz;	-41.9;-35.8	13.8 (1.4)	MERLIN	+H2O +OH +SiO	EVOLVED		1-3 Mar 1992
	05 55 49	+20 10 30	188.7150	-2.4928	G188.715-2.492	U Ori		22 GHz;	-39.3;-35.8	23.0 (0.4)	MERLIN	+H2O +OH +SiO	EVOLVED		14-17 April 1993
3	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt		22 GHz;	-3;23.1	437.0 (0.7)	MERLIN	+H2O +OH +SiO	EVOLVED		1-3 Mar 1992
	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt		22 GHz;	1.0;18.2	244.0 (3.0)	MkII	+H2O +OH +SiO	EVOLVED		29-30 Jan 1993
	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt		22 GHz;	-1;18.9	133.0 (0.3)	MERLIN	+H2O +OH +SiO	EVOLVED		14-17 April 1993
6	13 02 38	+05 11 07	310.3572	67.8955	G310.357+67.896	RT Vir		22 GHz;	8.0;30.4	121.0 (1.9)	MERLIN	+H2O +OH +SiO	EVOLVED		1-3 Mar 1992
	13 02 38	+05 11 07	310.3572	67.8955	G310.357+67.896	RT Vir		22 GHz;	8.4;27.0	46.1 (1.7)	MkII	+H2O +OH +SiO	EVOLVED		29-30 Jan 1993
	13 02 38	+05 11 07	310.3572	67.8955	G310.357+67.896	RT Vir		22 GHz;	7.9;26.3	134.0 (0.3)	MERLIN	+H2O +OH +SiO	EVOLVED		14-17 April 1993
9	13 46 12	-28 07 09	317.3796	33.2116	G317.380+33.212	W Hya		22 GHz;	37.8;45.0	56.0 (8.0)	MkII	+H2O			29-30 Jan 1993
	13 46 12	-28 07 09	317.3796	33.2116	G317.380+33.212	W Hya		22 GHz;	37.9;44.5	84.6 (1.1)	MERLIN	+H2O			14-17 April 1993
11	14 27 16	+04 40 43	352.6725	57.9729	G352.674+57.971	RS Vir		22 GHz;	-19.3;-11.4	29.9 (2.0)	MkII	+H2O +OH +SiO	EVOLVED		29-30 Jan 1993
	14 27 16	+04 40 43	352.6725	57.9729	G352.674+57.971	RS Vir		22 GHz;	-18.9;-12	49.5 (0.3)	MERLIN	+H2O +OH +SiO	EVOLVED		14-17 April 1993
13	15 21 23	+31 22 03	49.4725	57.1761	G49.473+57.174	S CrB	Descr	22 GHz;	-1.4;3.1	25.2 (2.0)	MkII	+H2O +OH +SiO	EVOLVED		29-30 Jan 1993
	15 21 23	+31 22 03	49.4725	57.1761	G49.473+57.174	S CrB		22 GHz;	1.8;3.4	32.2 (0.3)	MERLIN	+H2O +OH +SiO	EVOLVED		14-17 April 1993
15	16 25 47	+18 53 32	35.3440	40.3525	G35.345+40.351	U Her		22 GHz;	-19.5;-14.5	15.4 (1.8)	MkII	+H2O +OH +SiO	EVOLVED		29-30 Jan 1993
	16 25 47	+18 53 32	35.3440	40.3525	G35.345+40.351	U Her		22 GHz;	-23.1;-10.5	28.8 (0.3)	MERLIN	+H2O +OH +SiO	EVOLVED		14-17 April 1993
17	19 06 22	+08 13 46	41.9515	0.4545	G41.952+0.454	R Aql		22 GHz;	45.6;51.1	28.0 (2.2)	MkII	+H2O -CH3OH I +OH +SiO	EVOLVED		29-30 Jan 1993
	19 06 22	+08 13 46	41.9515	0.4545	G41.952+0.454	R Aql		22 GHz;	44.5;51.1	119.0 (0.3)	MERLIN	+H2O -CH3OH I +OH +SiO	EVOLVED		14-17 April 1993
19	05 55 49	+20 10 30	188.7150	-2.4928	G188.715-2.492	U Ori		321 GHz;	-39;-36.5	17.6 (2.8)	JCMT	+H2O +OH +SiO	EVOLVED		1-3 Mar 1992
	05 55 49	+20 10 30	188.7150	-2.4928	G188.715-2.492	U Ori		321 GHz;	-40.5;-34.3	16.8 (2.3)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
21	09 47 33	+11 25 43	223.7197	44.1579	G223.721+44.160	R Leo		321 GHz;	-3.6;2.2	18.6 (3.5)	JCMT	+H2O +OH +SiO	EVOLVED		1-3 Mar 1992
	09 47 33	+11 25 43	223.7197	44.1579	G223.721+44.160	R Leo		321 GHz;	-4.2;0.7	7.7 (2.3)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
23	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt		321 GHz;	2.6;17.9	9.2 (2.9)	JCMT	+H2O +OH +SiO	EVOLVED		1-3 Mar 1992
	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt		321 GHz;	3.7;9.7	46.1 (3.8)	JCMT	+H2O +OH +SiO	EVOLVED		12-13 Feb 1993
	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt		321 GHz;	2.8;10.2	39.6 (2.4)	JCMT	+H2O +OH +SiO	EVOLVED		3b_21 Feb 1993
	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt		321 GHz;	6.7;8.8	10.1 (2.6)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
27	13 02 38	+05 11 07	310.3572	67.8955	G310.357+67.896	RT Vir		321 GHz;	13.3;23.6	7.1 (2.3)	JCMT	+H2O +OH +SiO	EVOLVED		1-3 Mar 1992
	13 02 38	+05 11 07	310.3572	67.8955	G310.357+67.896	RT Vir		321 GHz;	10.7;23.9	7.4 (2.2)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
29	13 46 12	-28 07 09	317.3796	33.2116	G317.380+33.212	W Hya		321 GHz;	37.8;48.4	54.0 (7.7)	JCMT	+H2O			12-13 Feb 1993
	13 46 12	-28 07 09	317.3796	33.2116	G317.380+33.212	W Hya		321 GHz;	36.2;46.3	44.2 (2.2)	JCMT	+H2O			3b_21 Feb 1993
	13 46 12	-28 07 09	317.3796	33.2116	G317.380+33.212	W Hya		321 GHz;	35.9;48.4	41.0 (3.2)	JCMT	+H2O			14-17 April 1993
32	14 27 16	+04 40 43	352.6725	57.9729	G352.674+57.971	RS Vir		321 GHz;	-15.3;-10.4	145.0 (10.7)	JCMT	+H2O +OH +SiO	EVOLVED		3 Feb 1993
	14 27 16	+04 40 43	352.6725	57.9729	G352.674+57.971	RS Vir		321 GHz;	-14.8;-12.5	84.1 (4.7)	JCMT	+H2O +OH +SiO	EVOLVED		12-13 Feb 1993
	14 27 16	+04 40 43	352.6725	57.9729	G352.674+57.971	RS Vir		321 GHz;	-16.5;-10.4	119.0 (3.3)	JCMT	+H2O +OH +SiO	EVOLVED		3b_21 Feb 1993
	14 27 16	+04 40 43	352.6725	57.9729	G352.674+57.971	RS Vir		321 GHz;	-14.4;-13	20.7 (2.4)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
36	15 21 23	+31 22 03	49.4725	57.1761	G49.473+57.174	S CrB		321 GHz;	-2.8;2.6	22.3 (5.1)	JCMT	+H2O +OH +SiO	EVOLVED		3 Feb 1993
	15 21 23	+31 22 03	49.4725	57.1761	G49.473+57.174	S CrB		321 GHz;	-1.4;2.8	25.2 (3.7)	JCMT	+H2O +OH +SiO	EVOLVED		12-13 Feb 1993
	15 21 23	+31 22 03	49.4725	57.1761	G49.473+57.174	S CrB		321 GHz;	-2.1;4.9	12.1 (1.8)	JCMT	+H2O +OH +SiO	EVOLVED		3b_21 Feb 1993
39	16 25 47	+18 53 32	35.3440	40.3525	G35.345+40.351	U Her		321 GHz;	-21.1;-9.5	135.0 (5.2)	JCMT	+H2O +OH +SiO	EVOLVED		3 Feb 1993
	16 25 47	+18 53 32	35.3440	40.3525	G35.345+40.351	U Her		321 GHz;	-17.8;-9.7	175.0 (3.9)	JCMT	+H2O +OH +SiO	EVOLVED		12-13 Feb 1993
	16 25 47	+18 53 32	35.3440	40.3525	G35.345+40.351	U Her		321 GHz;	-18.3;-8.6	193.0 (1.9)	JCMT	+H2O +OH +SiO	EVOLVED		3b_21 Feb 1993
	16 25 47	+18 53 32	35.3440	40.3525	G35.345+40.351	U Her		321 GHz;		284.0 (2.0)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
43	19 06 22	+08 13 46	41.9515	0.4545	G41.952+0.454	R Aql		321 GHz;	46.6;49.8	28.4 (3.4)	JCMT	+H2O -CH3OH I +OH +SiO	EVOLVED		3 Feb 1993
	19 06 22	+08 13 46	41.9515	0.4545	G41.952+0.454	R Aql		321 GHz;	44.7;51.7	63.3 (2.0)	JCMT	+H2O -CH3OH I +OH +SiO	EVOLVED		14-17 April 1993
45	05 55 49	+20 10 30	188.7150	-2.4928	G188.715-2.492	U Ori		325 GHz;	-38.7;-34.8	20.9 (6.1)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
46	09 47 33	+11 25 43	223.7197	44.1579	G223.721+44.160	R Leo	Descr	325 GHz;	-3;4.3	40.7 (6.0)	JCMT	+H2O +OH +SiO	EVOLVED		1-3 Mar 1992
47	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt	Descr	325 GHz;	1.7;22.2	140.0 (11.3)	JCMT	+H2O +OH +SiO	EVOLVED		1-3 Mar 1992
	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt		325 GHz;	1.1;19.2	77.4 (5.2)	JCMT	+H2O +OH +SiO	EVOLVED		3b_21 Feb 1993
49	13 02 38	+05 11 07	310.3572	67.8955	G310.357+67.896	RT Vir	Descr	325 GHz;	9.4;26.8	18.2 (3.2)	JCMT	+H2O +OH +SiO	EVOLVED		25 Jan 1993
	13 02 38	+05 11 07	310.3572	67.8955	G310.357+67.896	RT Vir		325 GHz;	10.3;27.0	54.9 (8.5)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
51	13 46 12	-28 07 09	317.3796	33.2116	G317.380+33.212	W Hya	Descr	325 GHz;	36.4;46.0	307.0 (9.9)	JCMT	+H2O			25 Jan 1993
	13 46 12	-28 07 09	317.3796	33.2116	G317.380+33.212	W Hya		325 GHz;	35.0;45.3	245.0 (5.4)	JCMT	+H2O			3b_21 Feb 1993
	13 46 12	-28 07 09	317.3796	33.2116	G317.380+33.212	W Hya		325 GHz;	37.5;45.1	174.0 (14.2)	JCMT	+H2O			14-17 April 1993
54	14 27 16	+04 40 43	352.6725	57.9729	G352.674+57.971	RS Vir	Descr	325 GHz;	-17.2;-12.4	23.1 (2.9)	JCMT	+H2O +OH +SiO	EVOLVED		25 Jan 1993
	14 27 16	+04 40 43	352.6725	57.9729	G352.674+57.971	RS Vir		325 GHz;	-16.7;-12.1	15.4 (4.7)	JCMT	+H2O +OH +SiO	EVOLVED		3b_21 Feb 1993
56	15 21 23	+31 22 03	49.4725	57.1761	G49.473+57.174	S CrB		325 GHz;	-3.2;4.6	91.1 (4.9)	JCMT	+H2O +OH +SiO	EVOLVED		25 Jan 1993
	15 21 23	+31 22 03	49.4725	57.1761	G49.473+57.174	S CrB		325 GHz;	-2.3;3.4	56.0 (4.1)	JCMT	+H2O +OH +SiO	EVOLVED		3b_21 Feb 1993
	15 21 23	+31 22 03	49.4725	57.1761	G49.473+57.174	S CrB		325 GHz;	-1.6;2.0	39.7 (5.8)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
59	16 25 47	+18 53 32	35.3440	40.3525	G35.345+40.351	U Her	Descr	325 GHz;	-22.4;-10.8	45.5 (6.0)	JCMT	+H2O +OH +SiO	EVOLVED		25 Jan 1993
	16 25 47	+18 53 32	35.3440	40.3525	G35.345+40.351	U Her		325 GHz;	-19.9;-11	48.8 (4.4)	JCMT	+H2O +OH +SiO	EVOLVED		3b_21 Feb 1993
	16 25 47	+18 53 32	35.3440	40.3525	G35.345+40.351	U Her		325 GHz;	-25.2;-10.5	37.4 (7.8)	JCMT	+H2O +OH +SiO	EVOLVED		14-17 April 1993
62	19 06 22	+08 13 46	41.9515	0.4545	G41.952+0.454	R Aql	Descr	325 GHz;	43.9;50.1	84.2 (7.1)	JCMT	+H2O -CH3OH I +OH +SiO	EVOLVED		14-17 April 1993

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Descr.	Line	Fpeak	Telescope	Detection	Class	Date
	(J2000)	(J2000)	(deg.)	(deg.)				H2O	(Jy)		Yes/No
1	09 47 33	+11 25 43	223.7197	44.1579	G223.721+44.160	R Leo		22 GHz;	<6 (2.2)	MERLIN	+H2O +OH +SiO	EVOLVED	1-3 Mar 1992
	09 47 33	+11 25 43	223.7197	44.1579	G223.721+44.160	R Leo		22 GHz;	<1 (0.4)	MERLIN	+H2O +OH +SiO	EVOLVED	14-17 April 1993
3	13 02 38	+05 11 07	310.3572	67.8955	G310.357+67.896	RT Vir		321 GHz;	<11 (3.2)	JCMT	+H2O +OH +SiO	EVOLVED	3 Feb 1993
4	15 21 23	+31 22 03	49.4725	57.1761	G49.473+57.174	S CrB		321 GHz;	<10 (2.8)	JCMT	+H2O +OH +SiO	EVOLVED	14-17 April 1993
5	05 55 49	+20 10 30	188.7150	-2.4928	G188.715-2.492	U Ori	Descr	325 GHz;	<25 (8.2)	JCMT	+H2O +OH +SiO	EVOLVED	1-3 Mar 1992
6	09 47 33	+11 25 43	223.7197	44.1579	G223.721+44.160	R Leo		325 GHz;	<55 (20.0)	JCMT	+H2O +OH +SiO	EVOLVED	14-17 April 1993
7	11 00 34	-18 19 28	269.2699	37.1964	G269.270+37.196	R Crt		325 GHz;	<109 (36.3)	JCMT	+H2O +OH +SiO	EVOLVED	14-17 April 1993
8	14 27 16	+04 40 43	352.6725	57.9729	G352.674+57.971	RS Vir		325 GHz;	<13 (4.6)	JCMT	+H2O +OH +SiO	EVOLVED	14-17 April 1993

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