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SZY99 - A comparison of OH and H_2O maser properties of Mira and semiregular variable stars

Short title: Szymczak & Le Squeren (1999)
Authors: Szymczak, M. Le Squeren, A. M.
Journal: Monthly Notices of the Royal Astronomical Society, Volume 304, Issue 2, pp. 415-420.
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Abstract
A sample of 17 Miras and nine semiregular variable stars was simultaneously observed in the OH and H_2O maser lines with sensitivities of 0.15 and 0.6 Jy, respectively. One new H_2O source was detected. Among Miras the H_2O maser luminosity is well correlated with the OH maser luminosity. The ratio of H_2O to OH maser luminosities decreases by about four orders of magnitude from the semiregulars to the Miras as a result of an increase in the mass-loss rate. Some semiregulars have maser properties typical of Mira stars. H_2O emission is most likely to be detected from Miras at velocities close to the stellar velocity, while emission at blueshifted velocities dominates the detections from semiregulars. OH emission from the semiregulars usually occurs at greater redshifts and blueshifts with respect to the stellar velocities than OH emission observed from the Miras. The differences in the average composite maser profiles in both groups of stars can be related to the velocity gradients in the maser regions. It is suggested that some semiregular variables with maser emission may be in a later stage of stellar evolution than the Miras.	Comments: Velocity resolution: 0.28 km/s Upper limit for non-detections: <0.3 Jy (3σ) Data not given in Table 1 was provided by M. Szymzcak.

Abstract

A sample of 17 Miras and nine semiregular variable stars was simultaneously observed in the OH and H_2O maser lines with sensitivities of 0.15 and 0.6 Jy, respectively. One new H_2O source was detected. Among Miras the H_2O maser luminosity is well correlated with the OH maser luminosity. The ratio of H_2O to OH maser luminosities decreases by about four orders of magnitude from the semiregulars to the Miras as a result of an increase in the mass-loss rate. Some semiregulars have maser properties typical of Mira stars. H_2O emission is most likely to be detected from Miras at velocities close to the stellar velocity, while emission at blueshifted velocities dominates the detections from semiregulars. OH emission from the semiregulars usually occurs at greater redshifts and blueshifts with respect to the stellar velocities than OH emission observed from the Miras. The differences in the average composite maser profiles in both groups of stars can be related to the velocity gradients in the maser regions. It is suggested that some semiregular variables with maser emission may be in a later stage of stellar evolution than the Miras.

Comments:
Velocity resolution: 0.28 km/s
Upper limit for non-detections: <0.3 Jy (3σ)

Data not given in Table 1 was provided by M. Szymzcak.

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Detection table from Szymczak & Le Squeren (1999)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Spectra	Line	Frequency	V_range	V_peak	F_peak	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)				OH	(MHz)	(km/s)	(km/s)	(Jy)		Yes/No		(kpc)
1	23 58 24.9	+51 23 19.7	114.5608	-10.6191	G114.561-10.619	R Cas		1667 MHz;	1667	10.4	21.1	0.700	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
2	23 58 24.9	+51 23 19.7	114.5608	-10.6191	G114.561-10.619	R Cas		1665 MHz;	1665	6.7	23.1	0.520	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
3	02 44 45.5	+12 19 03	161.4735	-41.9194	G161.474-41.919	RU Ari		1612 MHz;	1612	7.9	16.2	0.560	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
4	02 44 45.5	+12 19 03	161.4735	-41.9194	G161.474-41.919	RU Ari		1667 MHz;	1667	1.2	23.6	0.610	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
5	02 44 45.5	+12 19 03	161.4735	-41.9194	G161.474-41.919	RU Ari		1665 MHz;	1665	6.2	17.5	0.094	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
6	00 03 21.3	+55 40 50	116.1440	-6.5562	G116.144-6.556	Y Cas	Spectra	1667 MHz;	1667	10.1	-22.2	0.420	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
7	00 03 21.3	+55 40 50	116.1440	-6.5562	G116.144-6.556	Y Cas		1665 MHz;	1665	9.5	-21.9	0.480	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
8	00 46 0.1	+69 10 53.4	122.4460	6.3149	G122.446+6.315	V524 Cas		1612 MHz;	1612	18.3	-34.8	1.280	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
9	00 46 0.1	+69 10 53.4	122.4460	6.3149	G122.446+6.315	V524 Cas		1667 MHz;	1667	24.5	-24.5	0.120	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
10	00 46 0.1	+69 10 53.4	122.4460	6.3149	G122.446+6.315	V524 Cas		1665 MHz;	1665	3.6	-28.1	0.080	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
11	10 53 37.4	+13 42 54.3	233.0220	59.4264	G233.022+59.426	W Leo		1667 MHz;	1667	9.3	41.8	0.210	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
12	10 53 37.4	+13 42 54.3	233.0220	59.4264	G233.022+59.426	W Leo		1665 MHz;	1665	1.1	50.6	0.200	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
13	16 25 47.5	+18 53 32.9	35.3451	40.3509	G35.345+40.351	U Her		1612 MHz;	1612	9.5	-18.5	2.480	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
14	16 25 47.5	+18 53 32.9	35.3451	40.3509	G35.345+40.351	U Her		1667 MHz;	1667	9.5	-18.7	5.160	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
15	16 25 47.5	+18 53 32.9	35.3451	40.3509	G35.345+40.351	U Her		1665 MHz;	1665	0.9	-18.8	4.150	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
16	05 55 49.2	+20 10 30.7	188.7151	-2.4921	G188.715-2.492	U Ori		1667 MHz;	1667	0.4	-41.5	1.630	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
17	05 55 49.2	+20 10 30.7	188.7151	-2.4921	G188.715-2.492	U Ori		1665 MHz;	1665	1.2	-41.6	2.210	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
18	04 28 18	+10 09 44.8	185.2174	-25.5813	G185.217-25.581	R Tau		1667 MHz;	1667	14.4	14.4	0.260	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
19	04 28 18	+10 09 44.8	185.2174	-25.5813	G185.217-25.581	R Tau		1665 MHz;	1665	14.7	14.7	0.180	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
20	15 21 39.5	+14 18 53.1	20.4982	52.7865	G20.498+52.787	S Ser		1667 MHz;	1667	25.2	25.2	0.310	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
21	15 21 39.5	+14 18 53.1	20.4982	52.7865	G20.498+52.787	S Ser		1665 MHz;	1665	6.2	19.3	0.140	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
22	06 37 31.3	-01 23 43.6	212.5880	-3.7325	G212.588-3.732	SY Mon		1667 MHz;	1667	6.2	-58.4	0.180	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
23	06 37 31.3	-01 23 43.6	212.5880	-3.7325	G212.588-3.732	SY Mon		1665 MHz;	1665	3.1	-55.3	0.190	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
24	22 12 16.2	+14 33 12.2	75.1858	-33.1833	G75.186-33.183	RS Peg		1667 MHz;	1667	20.3	-20.3	0.240	ENG15	+OH	EVOLVED		SZY99
25	22 12 16.2	+14 33 12.2	75.1858	-33.1833	G75.186-33.183	RS Peg		1665 MHz;	1665	20.0	-20.0	0.480	ENG15	+OH	EVOLVED		SZY99
26	14 27 16.4	+04 40 41.1	352.6741	57.9715	G352.674+57.971	RS Vir		1612 MHz;	1612	8.2	-18.4	1.950	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
27	14 27 16.4	+04 40 41.1	352.6741	57.9715	G352.674+57.971	RS Vir		1667 MHz;	1667	7.1	-17.4	0.660	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
28	14 27 16.4	+04 40 41.1	352.6741	57.9715	G352.674+57.971	RS Vir		1665 MHz;	1665	17.9	-17.9	0.910	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
29	09 47 33.5	+11 25 43.6	223.7207	44.1598	G223.721+44.160	R Leo		1665 MHz;	1665	5.6	-1.5	0.090	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
30	09 45 34.3	+34 30 42.8	190.5954	49.7711	G190.595+49.771	R LMi		1612 MHz;	1612	3.9	-3.9	0.320	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
31	09 45 34.3	+34 30 42.8	190.5954	49.7711	G190.595+49.771	R LMi		1667 MHz;	1667	8.5	-3.4	0.360	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
32	09 45 34.3	+34 30 42.8	190.5954	49.7711	G190.595+49.771	R LMi		1665 MHz;	1665	9.3	-4.1	0.970	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
33	13 19 27.8	+45 31 37.7	107.8913	70.7739	G107.891+70.774	V CVn		1667 MHz;	1667	6.7	6.7	0.190	ENG15	+H₂O +OH -SiO	EVOLVED		SZY99
34	13 02 38	+05 11 8.4	310.3571	67.8959	G310.357+67.896	RT Vir		1665 MHz;	1665	10.0	13.6	0.630	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
35	13 02 38	+05 11 8.4	310.3571	67.8959	G310.357+67.896	RT Vir		1667 MHz;	1667	13.5	10.7	3.840	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
36	07 55 40.2	-28 38 54.8	245.4375	-0.1475	G245.438-0.147	HU Pup		1665 MHz;	1665	0.8	34.6	0.300	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
37	07 55 40.2	-28 38 54.8	245.4375	-0.1475	G245.438-0.147	HU Pup		1667 MHz;	1667	1.1	33.2	0.520	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
38	11 00 33.9	-18 19 29.6	269.2695	37.1958	G269.270+37.196	R Crt		1665 MHz;	1665	1.0	1.7	1.080	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99
39	11 00 33.9	-18 19 29.6	269.2695	37.1958	G269.270+37.196	R Crt		1667 MHz;	1667	1.1	1.7	3.240	ENG15	+H₂O +OH +SiO	EVOLVED		SZY99

Non-detection table from Szymczak & Le Squeren (1999)