Photometric Parameters of RR Lyr Variable Stars in the Galactic Bulge

Details Photometric Parameters of RR Lyr Variable Stars in the Galactic Bulge Photometric Parameters of RR Lyr Variable Stars in the Galactic Bulge

1997-04-03

arxiv.org/abs/astro-ph/9704036v2

Astronomy and Astrophysics

Astrophysics

accepted for publication in Acta Astronomica (Vol. 47, p. 183), 16 pages, LaTeX file with 5 figures, based on OGLE data

Scientific paper

We present a complete set of OGLE photometric measurements for 214 RR Lyrae variables in the Galactic bulge, based on four observing seasons: 1992-95. These are mostly I-band measurements, with some V-band observations obtained mainly in 1995. Based on this material we construct the Fourier decomposition of the I-band light curves and investigate different types of RR Lyr variability. We also determine the value of the extinction-insensitive parameter V_{V-I} for RR Lyr stars in fields with different galactic longitude l and compare with values of V_{V-I} calculated for red clump stars by Stanek et al. (1994). The observed and free from interstellar extinction mean brightness and V-I color of RR Lyr stars are also presented.

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