Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.5903s&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #59.03; Bulletin of the American Astronomical Society, Vol. 27, p.1370
Astronomy and Astrophysics
Astronomy
Scientific paper
The color-magnitude diagrams of ~ 1 x 10(6) stars obtained for 20 fields across the Galactic bulge by the Optical Gravitational Lensing Experiment (OGLE) collaboration reveal a well-defined population of bulge red clump stars. We found that the distributions of the extinction-adjusted apparent magnitudes of red clump stars in fields lying at l=+/-5deg in galactic longitude differ by ~ 0.4; mag. A plausible explanation of this observed difference in the luminosity distribution is that the Galactic bulge is a triaxial structure, or a bar, which is inclined to the line of sight by no more than 45deg . The part of the bar at the positive galactic longitude is closer to us. Work is now under way to model the Galactic bar by fitting the observed luminosity functions in the red clump region for various fields. Preliminary results indicate that the angle of the inclination of the bar to the line of sight can be as small as ~ 20deg . Gravitational microlensing can provide us with additional constrains on the structure of the Galactic bar.
Kaluzny Janusz
Krzeminski Wojciech
Kubiak Mateo M. M.
Mateo Mario
Stanek Kris Z.
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