Journal Article

SiO Masers in Stars in the Inner and Outer Galactic Disk

B. W. Jiang, Shuji Deguchi and B. Ramesh

in Publications of the Astronomical Society of Japan

Volume 51, issue 1, pages 95-102
Published in print February 1999 | ISSN: 0004-6264
Published online February 1999 | e-ISSN: 2053-051X | DOI: https://dx.doi.org/10.1093/pasj/51.1.95
SiO Masers in Stars in the Inner and Outer Galactic Disk

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Observations in the J = 1–0, v = 1 and v = 2 28SiO and v = 0 29SiO maser lines were made towards 97 outer- and 19 inner-disk IRAS sources with typical IRAS colors of AGB stars. 21 new 28SiO and 1 new 29SiO maser sources were detected above the 5 σ level of ∼ 1 Jy with the Nobeyama 45 m telescope. Collecting all of the observational data in SiO J = 1–0 maser lines taken with a 45 m telescope, a comparison is made between the outer-disk, inner-disk, and bulge samples. The samples, themselves, align a sequence of mid-infrared color, flux at 12 μm and IRAS variability index. The detection rates are 66%, 51%, and 31%, respectively, in the bulge, inner disk, and outer disk. This fact is consistent with the tendency of increasing proportion of C-rich stars in the IRAS sample and metallicity gradient with the galactocentric distance.

Keywords: Infrared: sources; masers; stars: late-type; Stars: mass-loss

Journal Article.  0 words. 

Subjects: Astrometry and Celestial Mechanics ; Stars

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