SiO Masers in Stars in the Inner and Outer Galactic Disk

Details SiO Masers in Stars in the Inner and Outer Galactic Disk SiO Masers in Stars in the Inner and Outer Galactic Disk

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasj...51...95j&link_type=abstract

Publications of the Astronomical Society of Japan, v.51, p.95-102.

Astronomy and Astrophysics

Astronomy

9

Infrared: Sources, Masers, Stars: Late-Type, Stars: Mass Loss

Scientific paper

Observations in the J=1--0, v=1 and v=2 ^{{28}} SiO and v=0 ^{{29}} SiO maser lines were made towards 97 outer- and 19 inner-disk IRAS sources with typical IRAS colors of AGB stars. 21 new ^{{28}} SiO and 1 new ^{{29}} SiO maser sources were detected above the 5 sigma 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 mu m 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.

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