Eclipsing Binaries in the OGLE Variable Star Catalog.III. Long-Period Contact Systems
arXiv:astro-ph/9711317 · doi:10.1086/300266
Abstract
A sample of contact binaries discovered by the OGLE project in Baade's Window, with orbital periods longer than one day and with available color and light-curve data, has been analyzed. It consists of only 32 systems, in contrast to 388 WUMa-type systems with shorter periods which were analyzed before. Most systems are very distant and are probably located close to or in the galactic Bulge. Two groups of contact binaries are seen in the sample: (1) a continuation of the WUMa-type sequence, extending up to the orbital periods of 1.3 - 1.5 day, but rather sharply ending in this period range; (2) an inhomogeneous group of rare systems with long periods up to 26 days, all with red colors and relatively shallow eclipses. While the systems of the first group share most of the characteristics of the typical WUMa-type systems (except that they are on the average brighter and more distant, hence more reddened), the long-period systems do not seem to form an early-type extension of contact binaries, but may consist of a mixture of late-type objects, including tidally distorted red giants with invisible companions.
24 pages including 10 figures (inserted with psfig) and one table; submitted to AJ
References in corpus (3)
Cited by in corpus (18)
- V1309 Scorpii: merger of a contact binary
- Eclipsing binaries in ASAS catalog
- Contact Binaries of the Galactic Disk: Comparison of the Baade's Window and Open Cluster Samples
- Lessons from the Onset of a Common Envelope Episode: the Remarkable M31 2015 Luminous Red Nova Outburst
- The photometric-amplitude and mass-ratio distributions of contact binary stars
- The 7.5 Magnitude Limit Sample of Bright Short-Period Binary Stars. I. How Many Contact Binaries Are There?
- New low mass ratio contact binaries in the Catalina Sky Survey
- Eclipsing binaries in the MACHO database: New periods and classifications for 3031 systems in the Large Magellanic Cloud
- 15000 Ellipsoidal Binary Candidates in TESS: Orbital Periods, Binary Fraction, and Tertiary Companions
- Eclipsing binary stars in the Large Magellanic Cloud. Results from the EROS-2, OGLE and VMC surveys
- Spectroscopic metallicity determinations for W~UMa-type binary stars
- W Crv: The shortest-period Algol with non-degenerate components?
- Eclipsing Binaries in the OGLE Variable Star Catalog. IV. The Pre-Contact, Equal-Mass Systems
- First spectra of the W UMa system V524 Monocerotis
- YZ Phe: an active contact binary with variation of the O'Connell effect and orbital period change
- Eclipsing Binaries in the OGLE Variable Star Catalogs.V. Long-Period Beta Lyrae-type Systems in the Small Magellanic Cloud and the PLC-beta Relation
- Identifying RR Lyrae in the ZTF DR3 dataset
- Pipeline Reduction of Binary Light Curves from Large-Scale Surveys