Near-Infrared Observations of the IRAS/SiO Sources in the Galactic Bulge: a Large Scale Distribution

Details Near-Infrared Observations of the IRAS/SiO Sources in the Galactic Bulge: a Large Scale Distribution Near-Infrared Observations of the IRAS/SiO Sources in the Galactic Bulge: a Large Scale Distribution

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54..719d&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.54, No.5, pp.719-734

Astronomy and Astrophysics

Astronomy

13

Galaxies: Milky Way, Infrared: Sources, Stars: Kinematics, Stars: Long-Period Variables, Stars: Mass-Loss

Scientific paper

Near-infrared photometric observations in the J-, H-, and K-bands were made for 120 IRAS sources toward the Galactic bulge ( -10° < l < 15° and |b| < 3°, excluding |l| < 3° ). They are well-confirmed, mass-losing late-type stars having accurate radial velocities derived from SiO maser observations. For 118 sources, single, unambiguous near-infrared counterparts were found within the errors of the IRAS/MSX positions; and for the other 2 sources, faint candidates only detectable in the K-band were found. From the J-, H-, and K-bands and IRAS 12 and 25 μm intensities, we estimated the spectral energy distributions of the sources, and obtained distances assuming a constant intrinsic luminosity. Adding all of the distance data of the IRAS/SiO sources in -10° < l < 25° published in previous papers, we mapped the positions of 272 sampled stars onto the Galactic plane. The map clearly shows a bar structure, where the major axis of the bar is oriented 22° (+/- 8°) from the Sun-Galactic center line. We also reanalyzed the radial-velocity shift with the distance in this sample. These analyses suggest that the data are consistent with the current bar theory of the Galactic bulge.

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