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SJO02 - H2O and SiO maser emission in Galactic center OH/IR stars $O and SiO maser emission in Galactic center OH/IR stars

Short title: Sjouwerman et al. (2002)
Authors: Sjouwerman, L. O. Lindqvist, M. van Langevelde, H. J. Diamond, P. J.
Journal: Astronomy and Astrophysics, v.391, p.967-978 (2002)
Bibcode:

Non-detection table: Show non-detection table
Detection table: Show detection table (14 detection)
Target type: star

Abstract
We have performed targeted surveys for 22 GHz H₂O and 43 GHz SiO maser emission in Galactic center OH/IR stars using the Very Large Array. Some of the detections have been used in a previous paper to investigate the possibility of measuring milli-arcsecond accurate positions (to obtain stellar proper motions) in the Galactic center. Here we report on the detection of at least 25 H₂O masers and 18 SiO masers associated with stars within 2 degr and 15 arcmin of Sgr A*, respectively. This survey has more than doubled the total number of proper motion candidates to at least about 50 stellar objects. The stellar SiO masers are best suited for proper motion studies, although the initial OH, H₂O or SiO maser positions may not be well enough determined to use for a-priori VLBI positions. Serendipitously we also found 8 H₂O masers in the molecular cloud M-0.13-0.08. Figures 1 to 4 are only available in electronic form at http://www.edpsciences.org. Tables \ref{tab2}-\ref{tab4} are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/391/967	Comments: Sources associated with star-forming regions (SFR) were omitted Peak flux densities Speak were assigned to velocities (vblue or vred) using the spectra. Coordinates for sources from Table 5 taken from OH-Maser-Database.

Abstract

We have performed targeted surveys for 22 GHz H₂O and 43 GHz SiO maser emission in Galactic center OH/IR stars using the Very Large Array. Some of the detections have been used in a previous paper to investigate the possibility of measuring milli-arcsecond accurate positions (to obtain stellar proper motions) in the Galactic center. Here we report on the detection of at least 25 H₂O masers and 18 SiO masers associated with stars within 2 degr and 15 arcmin of Sgr A*, respectively. This survey has more than doubled the total number of proper motion candidates to at least about 50 stellar objects. The stellar SiO masers are best suited for proper motion studies, although the initial OH, H₂O or SiO maser positions may not be well enough determined to use for a-priori VLBI positions. Serendipitously we also found 8 H₂O masers in the molecular cloud M-0.13-0.08. Figures 1 to 4 are only available in electronic form at Tables \ref{tab2}-\ref{tab4} are also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via

Comments:
Sources associated with star-forming regions (SFR) were omitted
Peak flux densities Speak were assigned to velocities (vblue or vred) using the spectra.
Coordinates for sources from Table 5 taken from OH-Maser-Database.

Input tables: J/A+A/391/967/table2.dat and Table 5
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Detection table from Sjouwerman et al. (2002)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	V_range	V_peak	F_peak	∫F dv	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			(km/s)	(km/s)	(Jy)	(Jy*km/s)		Yes/No		(kpc)
1	17 44 44.5	-29 05 37.3	359.7653	0.0817	G359.7651+0.0817	OH359.765+0.082	0.00	111.5	0.97	58.2	ENG_SIO	+H₂O +OH +SiO	EVOLVED		SJO02
2	17 44 55.6	-28 52 26.2	359.9740	0.1618	G359.9739+0.1619	OH359.974+0.162	0.00	27.7	0.51	48.7	ENG_SIO	+OH +SiO	SFR_MIXED		SJO02
3	17 45 3.2	-29 07 12.4	359.7786	0.0096	G359.7783+0.0097	OH359.778+0.010	0.00	-28.4	0.58	21.1	ENG_SIO	+OH +SiO	SFR_MIXED		SJO02
4	17 45 13.1	-29 09 35	359.7634	-0.0416	G359.7630-0.0415	OH359.763-0.042	0.00	122.7	0.19	8.7	ENG_SIO	+OH +SiO	SFR_MIXED		SJO02
5	17 45 13.9	-29 06 55.2	359.8029	-0.0211	G359.8029-0.0206	OH359.803-0.021	0.00	-15	0.31	26.4	ENG_SIO	+OH +SiO	EVOLVED		SJO02
6	17 45 26.4	-29 08 2.3	359.8107	-0.0695	G359.8102-0.0695	*OH359.810-0.070	0.00	-33.9	0.22	15.9	ENG_SIO	+OH +SiO	SFR_MIXED		SJO02
7	17 45 34.8	-29 06 3.1	359.8548	-0.0783	G359.8548-0.0780	*OH359.855-0.078	0.00	4	0.38	25.4	ENG_SIO	+H₂O +OH +SiO	SFR_MIXED		SJO02
8	17 45 34.3	-28 49 55.9	0.0832	0.0633	G0.0830+0.0634	*OH000.083+0.064	0.00	23.3	0.28	16.9	ENG_SIO	+OH +SiO	SFR_MIXED		SJO02
9	17 45 38.7	-28 59 45.6	359.9517	-0.0358	G359.9518-0.0355	OH359.952-0.036	0.00	84.9	0.28	17.5	ENG_SIO	-H₂O -CH₃OH I +SiO	SFR_MIXED		SJO02
10	17 45 40.6	-29 00 24.1	359.9463	-0.0474	G359.9444-0.0464	*OH359.946-0.047	0.00	-27.3	0.44	42.7	ENG_SIO	+H₂O +CH₃OH I -CH₃OH II +OH	SFR_MIXED		SJO02
11	17 45 40.2	-28 59 46.9	359.9544	-0.0408	G359.9540-0.0405	OH359.954-0.041	0.00	71.3	0.19	23.7	ENG_SIO				SJO02
12	17 45 51.3	-28 48 07	0.1415	0.0259	G0.1416+0.0261	OH000.142+0.026	0.00	23.9	0.27	11.1	ENG_SIO	+SiO	SFR_MIXED		SJO02
13	17 46 10.4	-29 00 51.2	359.9964	-0.1440	G359.9960-0.1440	OH359.996-0.144	0.00	-32.3	0.34	11.4	ENG_SIO	+OH +SiO	EVOLVED		SJO02
14	17 46 35.4	-28 58 56.9	0.0708	-0.2052	G0.071-0.205	OH000.071-0.205	0.00	114.1	0.46	14.4	ENG_SIO	+H₂O +OH +SiO	SFR_MIXED		SJO02

Distribution of sources in all sky (l,b)

Distribution of sources in all sky using Aladin

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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 SJO02

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