Mira variables in the Galactic bulge with OGLE-II data

Details Mira variables in the Galactic bulge with OGLE-II data Mira variables in the Galactic bulge with OGLE-II data

2005-09-30

arxiv.org/abs/astro-ph/0510004v2

Mon.Not.Roy.Astron.Soc.364:117-125,2005

Astronomy and Astrophysics

Astrophysics

10 pages, 16 figures, published in MNRAS. Added note in proof

Scientific paper

10.1111/j.1365-2966.2005.09556.x

We have extracted a total of 1968 Mira variables from the OGLE-II data base in the Galactic bulge region. Among them, 1960 are associated with 2MASS sources, and 1541 are further identified with MSX point sources. Their photometric properties are compared with those of Mira variables in the Large and Small Magellanic Clouds. We have found that mass-losing stars with circumstellar matter are reddened such that the colour dependence of the absorption coefficient is similar to that of interstellar matter. We also discuss the structure of the bulge. The surface number density of the bulge Mira variables is well correlated with the 2.2-micron surface brightness obtained by the COBE satellite. Using this relation, the total number of Mira variables in the bulge is estimated to be about 600,000. The logP-K relation of the Mira variables gives their space distribution which supports the well-known asymmetry of the bar-like bulge.

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