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Ultra-Short-Period Binary Systems in the OGLE Fields Toward the Galactic Bulge

Authors :
Soszyński, I.
Stępień, K.
Pilecki, B.
Mráz, P.
Udalski, A.
Szymański, M. K.
Pietrzyński, G.
Wyrzykowski, Ł.
Ulaczyk, K.
Radoslaw Poleski
Kozłowski, S.
Pietrukowicz, P.
Skowron, J.
Pawlak, M.
Source :
Scopus-Elsevier, ResearcherID, Michał Krzysztof Szymański
Publication Year :
2015
Publisher :
arXiv, 2015.

Abstract

We present a sample of 242 ultra-short-period (P < 0.22 d) eclipsing and ellipsoidal binary stars identified in the OGLE fields toward the Galactic bulge. Based on the light curve morphology, we divide the sample into candidates for contact binaries and non-contact binaries. In the latter group we distinguish binary systems consisting of a cool main-sequence star and a B-type subdwarf (HW Vir stars) and candidates for cataclysmic variables, including five eclipsing dwarf novae. One of the detected eclipsing binary systems - OGLE-BLG-ECL-000066 - with the orbital period below 0.1 d, likely consists of M dwarfs in a nearly contact configuration. If confirmed, this would be the shortest-period M-dwarf binary system currently known. We discuss possible evolutionary mechanisms that could lead to the orbital period below 0.1 d in an M-dwarf binary.<br />25 pages, 11 figures, submitted to Acta Astronomica

Details

Database :
OpenAIRE
Journal :
Scopus-Elsevier, ResearcherID, Michał Krzysztof Szymański
Accession number :
edsair.doi.dedup.....d1b90114df9ecd80490ef3be24032750
Full Text :
https://doi.org/10.48550/arxiv.1503.02080