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SZY95A - A survey of main-line OH maser emission from semiregular variables.

Interferometry data

Short title: Szymczak et al. (1995A)
Authors: Szymczak, M. Le Squeren, A. M. Sivagnanam, P. Tran Minh, F. Fournier, A.
Journal: Astronomy and Astrophysics, v.297, p.494
Bibcode:

Abstract

We have made a high sensitivity (~0.15Jy) search in the OH main-lines for maser emission from a sample of 181 semiregular variables. OH emission was observed towards five stars. Two new OH lines were detected and one tentatively. About 10% of semiregulars with distances less than 300pc have associated OH maser emission. The OH semiregulars show much redder near and far infrared colors than similar non-OH stars. On the average, their mass loss rates and OH luminosities are slightly lower than in the long period Mira variables. Basing on the optical and infrared properties of the semiregulars and long period variables we confirmed that properties of the SRa stars are intermediate between those of SRb and Mira variables. The occurrence of strongly polarized, low luminosity OH main-line maser only, together with relatively low efficiency of pumping by the infrared photons, provides evidence that the semiregulars are less evolved than the Mira-type variables. This can support the existence of an evolutionary sequence of SRb-SRa-Mira variables. However, the expansion velocities of some OH semiregulars are higher than those observed in most type I OH Miras and their pulsational properties may suggest that they are in a peculiar evolutionary phase.

Comments:
Velocity resolution: 0.56 km/s
Upper limit for non-detections: 0.15 Jy (3σ)

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Detection table from Szymczak et al. (1995A)

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ID	Obs. RA	Obs. Dec	l	b	Source name	Frequency	V_low	V_up	V_peak	V_peak(2)	F_peak	F_peak(2)	List	Ref.	Detection
	(J2000)	(J2000)	(deg.)	(deg.)		(MHz)	(km/s)	(km/s)	(km/s)	(km/s)	(Jy)	(Jy)			Yes/No
1	07 55 40.4	-28 38 56	245.438221	-0.146964	IRAS 07536-2830	1665	34.3		34.3		0.300		ENG15	SZY95A	+H₂O +OH +SiO
2	07 55 40.4	-28 38 56	245.438221	-0.146964	IRAS 07536-2830	1667	34.3		34.3		0.700		ENG15	SZY95A	+H₂O +OH +SiO
3	11 00 33.5	-18 19 27	269.267575	37.195651	IRAS 10580-1803	1665	1.7		1.7		2.500		ENG15	SZY95A	+H₂O +OH +SiO
4	11 00 33.5	-18 19 27	269.267575	37.195651	IRAS 10580-1803	1667	1.7	19.7	1.7	19.7	4.500	0.2	ENG15	SZY95A	+H₂O +OH +SiO
5	13 02 38.1	+05 11 08	310.358355	67.895706	IRAS 13001+0527	1665	11.2	23.6	11.2	23.6	0.300	1.9	ENG15	SZY95A	+H₂O +OH +SiO
6	13 02 38.1	+05 11 08	310.358355	67.895706	IRAS 13001+0527	1667	10.8	24.0	10.8	24.0	3.300	2.6	ENG15	SZY95A	+H₂O +OH +SiO
7	13 49 2.4	-28 22 05	318.023907	32.809984	IRAS 13462-2807	1665	33.6	36.3	33.6	36.3	4.900	9.9	ENG15	SZY95A	+H₂O +OH +SiO
8	13 49 2.4	-28 22 05	318.023907	32.809984	IRAS 13462-2807	1667	36.1	43.4	36.1	43.4	32.000	7	ENG15	SZY95A	+H₂O +OH +SiO
9	14 24 11.2	+25 42 15	34.277868	69.214385	IRAS 14219+2555	1665	-0.2		-0.2		0.400		ENG15	SZY95A	+H₂O +OH +SiO
10	22 05 41.6	+35 20 52	88.713383	-16.285059	IRAS 22035+3506	1667	1.4		1.4		0.130		ENG15	SZY95A	+H₂O +OH +SiO

Non-detection table from Szymczak et al. (1995A)

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Detection
Yes/No

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IRAS source	IRAS coordinates (RA, Dec)	IRAS flux density (F12,F25,F60,F100)
2MASS source	2MASS coordinates (RA, Dec)	2MASS magnituted (J,H,K)

Variable star	Variable star parameters	Star Formation Region name	Star Formation Region parameters
WISE source	WISE coordinates (RA, Dec)	WISE magnitudes (w1, w2, w3, w4)
Akari IRC source	Akari IRC coordinates (RA, Dec)	Akari IRC fluxes (S09, S18)
Akari FIS source	Akari FIS coordinates (RA, Dec)	Akari FIS fluxes (S65, S90, S140, S160)

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DSS (optical)	2MASS (JHK)	WISE (4-22 um)	IRAC (3-8 um)	GLIMPSE 360 (3.6-4.5 um)	PACS color (70-160 um)	SPIRE color (250-500 um)
AKARI color (60-160 um)	NVSS (1.4 GHz)	SDSS (optical+NIR)	Image size: arcsec (default is 120 arcsec)
			Image size: arcsec (default is 120 arcsec)

X

Position of H₂O maser detection

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)
UKIDSS K	2MASS K