DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. VIII. Additional Variables in the Field M33B Discovered with Image Subtraction (original) (raw)
NASA/ADS
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Abstract
DIRECT is a project to obtain directly the distances to two Local Group galaxies, M31 and M33, which occupy a crucial position near the bottom of the cosmological distance ladder. As the first step of the DIRECT project we have searched for detached eclipsing binaries (DEBs) and new Cepheids in the M31 and M33 galaxies with 1 m class telescopes. In this eighth paper we present a catalog of variable stars discovered in the data from the follow-up observations of DEB system D33J013337.0+303032.8 in field M33B [(α,δ)=(23.48d,30.57d), J2000.0], collected with the Kitt Peak National Observatory 2.1 m telescope. In our search covering an area of 108 arcmin2 we have found 895 variable stars: 96 eclipsing binaries, 349 Cepheids, and 450 other periodic, possibly long-period or nonperiodic variables. Of these variables 612 are newly discovered. Their light curves were extracted using the ISIS image subtraction package. For 77% of the variables we present light curves in standard V and B magnitudes, with the remaining 23% expressed in units of differential flux. We have discovered a population of first-overtone Cepheid candidates, and for six of them we present strong arguments in favor of this interpretation. The catalog of variables, as well as their photometry (about 9.2×104 BV measurements) and finding charts, is available electronically via anonymous ftp and the World Wide Web. The complete set of the CCD frames is available upon request. Based on observations obtained with the 2.1 m telescope at Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.
Publication:
The Astronomical Journal
Pub Date:
November 2001
DOI:
arXiv:
Bibcode:
Keywords:
- Stars: Binaries: Eclipsing;
- Stars: Variables: Cepheids;
- Cosmology: Distance Scale;
- Galaxies: Individual: Messier Number: M33;
- Stars: Variables: Other;
- Astrophysics
E-Print:
21 pages of text, 27 pages of tables, 14 figures