H2O and SiO maser emission in galactic center OH/IR stars

L. O. Sjouwerman; M. Lindqvist; H. J. Van Langevelde; P. J. Diamond

doi:10.1051/0004-6361:20020983

H2O and SiO maser emission in galactic center OH/IR stars

L. O. Sjouwerman, M. Lindqvist, H. J. Van Langevelde, P. J. Diamond

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Abstract

We have performed targeted surveys for 22 GHz H2O and 43 GHz SiO maser emission in Galactic 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° and 15′ 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.

Original language	English
Pages (from-to)	967-978
Number of pages	11
Journal	Astronomy and Astrophysics
Volume	391
Issue number	3
DOIs	https://doi.org/10.1051/0004-6361:20020983
Publication status	Published - Sept 2002

Keywords

Astrometry
Galaxy: center
Masers
Stars: AGB and post-AGB
Surveys

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10.1051/0004-6361:20020983

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title = "H2O and SiO maser emission in galactic center OH/IR stars",

abstract = "We have performed targeted surveys for 22 GHz H2O and 43 GHz SiO maser emission in Galactic 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° and 15′ 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.",

keywords = "Astrometry, Galaxy: center, Masers, Stars: AGB and post-AGB, Surveys",

author = "Sjouwerman, \{L. O.\} and M. Lindqvist and \{Van Langevelde\}, \{H. J.\} and Diamond, \{P. J.\}",

year = "2002",

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doi = "10.1051/0004-6361:20020983",

language = "English",

volume = "391",

pages = "967--978",

journal = "Astronomy and Astrophysics",

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TY - JOUR

T1 - H2O and SiO maser emission in galactic center OH/IR stars

AU - Sjouwerman, L. O.

AU - Lindqvist, M.

AU - Van Langevelde, H. J.

AU - Diamond, P. J.

PY - 2002/9

Y1 - 2002/9

N2 - We have performed targeted surveys for 22 GHz H2O and 43 GHz SiO maser emission in Galactic 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° and 15′ 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.

AB - We have performed targeted surveys for 22 GHz H2O and 43 GHz SiO maser emission in Galactic 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° and 15′ 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.

KW - Astrometry

KW - Galaxy: center

KW - Masers

KW - Stars: AGB and post-AGB

KW - Surveys

UR - https://www.scopus.com/pages/publications/0036727823

U2 - 10.1051/0004-6361:20020983

DO - 10.1051/0004-6361:20020983

M3 - Article

SN - 0004-6361

VL - 391

SP - 967

EP - 978

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 3

ER -

H2O and SiO maser emission in galactic center OH/IR stars

Abstract

Keywords

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