Eclipsing binaries in the Galactic Bulge: candidates for distance estimates

Abstract

The 222~000 I-band light curves of variable stars detected by the OGLE-II survey in the direction of the Galactic Bulge have been searched for eclipsing binaries (EBs). A previously developed code to analyze lightcurve shapes and identify long period variables (LPVs) has been adapted to identify EBs. The parameters in the modified code have been optimised to recover a list of about 140 detached EBs in the Small Magellanic Cloud previously identified in the literature as particularly well suited for distance estimates (and wich have periods \more 0.85 days). The power of the code is demonstrated by identifying 16 and 178 previously uncatalogued EBs in the SMC and LMC, respectively. Among the 222~000 variable stars in the direction of the Galactic Bulge 3053 EBs have been identified. Periods and phased lightcurves are presented.

accepted Astronomy and Astrophysics

References in corpus (4)

• New Period-Luminosity and Period-Color Relations of Classical Cepheids: II. Cepheids in LMC
• Extinction Map of the Galactic center: OGLE-II Galactic bulge fields
• Long Period Variables in the Magellanic Clouds: OGLE + 2MASS + DENIS
• The Large-Scale Extinction Map of the Galactic Bulge from the MACHO Project Photometry

Cited by in corpus (4)

• Variability of Massive Stars with Known Spectral Types in the Small Magellanic Cloud Using 8 Years of OGLE-III Data
• Automated supervised classification of variable stars II. Application to the OGLE database
• Eclipsing binary stars in the Large Magellanic Cloud. Results from the EROS-2, OGLE and VMC surveys
• Tracing the structure of the Milky Way with detached eclipsing binaries from the VVV survey - I. The method and initial results