Roche Modeling and Evolutionary History of Six Low Mass Contact Binary Systems

• Autorzy: Alton K. B. , Stępień K.

Identyfikatory

DOI

10.32023/0001-5237/71.2.4

• Języki publikacji: EN

Abstrakty

EN

We describe six eclipsing binary systems that were first detected by the ROTSE-I telescope and ultimately shown to be low mass contact binaries (LMCB). New photometric data (B, V and I_c) acquired from V473 Cam, PV Com, EI CVn, V2790 Ori, V2802 Ori and PS Vir were used to calculate an orbital period for each system along with updated ephemerides. All systems were subject to secular changes in orbital period with evidence for a third gravitationally bound body in V473 Cam, EI CVn, V2790 Ori, and PS Vir. Since a total eclipse is observed in all six systems, Roche modeling based on the Wilson-Devinney (WD) code yielded in each case a well-constrained photometric value for the mass ratio. Potential progenitors of these LMCBs were evaluated using an evolutionary model of cool close binaries. The best fits were obtained when the initial detached binaries have orbital periods ranging from 2.70 d to 3.71 d, total masses between 1.36 M and 1.53 M with mass ratios ranging from 2.34 to 4.04. The model progenitors require between 7.75-10.9 Gyr to attain the presently observed orbital period and physical attributes. Collectively, the models show that about half of orbital periods will increase in the future leading to a common envelope resulting from the evolutionary expansion of the accretor whereas the other half will decrease resulting in the overflow of the outer critical Roche surface and an ultimate merger.

Słowa kluczowe

EN

binaries: eclipsing; stars: evolution; techniques: photometric

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2021
• Tom: Vol. 71, No. 2
• Strony: 123--161
• Opis fizyczny: Bibliogr. 100 poz., rys., tab., wykr.

Twórcy

autor

Alton K. B.

• Desert Blooms Observatory, Benson, AZ 85602, USA

autor

Stępień K.

• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)