DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. VIII. Additional Variables in the Field M33B Discovered with Image Subtraction

Details DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. VIII. Additional Variables in the Field M33B Discovered with Image Subtraction DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. VIII. Additional Variables in the Field M33B Discovered with Image Subtraction

2001-07-16

arxiv.org/abs/astro-ph/0107279v1

2001, AJ, 122, 2477

Astronomy and Astrophysics

Astrophysics

21 pages of text, 27 pages of tables, 14 figures; version with full resolution figures available through ftp at ftp://cfa-ft

Scientific paper

10.1086/323718

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 1m-class telescopes. In this eighth paper we present a catalog of variable stars discovered in the data from the followup observations of DEB system D33J013337.0+303032.8 in field M33B [(RA,Dec)= (23.48, 30.57), J2000.0], collected with the Kitt Peak National Observatory 2.1m telescope. In our search covering an area of 108 sq. arcmin. we have found 895 variable stars: 96 eclipsing binaries, 349 Cepheids, and 450 other periodic, possible long period or non-periodic 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*10^4 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.

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