Investigation of the stability of the extreme low mass ratio contact binaries SX Crv and XX Sex, which are analysed photometrically
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Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Sci Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The photometric analyses of the extreme low mass ratio contact binaries SX Crv and XX Sex were conducted in detail. Light curves of SX Crv and XX Sex were retrieved from TESS, and light curve analyses were performed simultaneously with radial velocities. The mass ratios for SX Crv and XX Sex were calculated as 0.077(1) and 0.099(2). The masses of the primary components account for about 90% of the total masses of the systems and were determined to be 1.256(48) M (R) (R) and 1.337(37) M (R) (R) for SX Crv and XX Sex, respectively. It has been observed that the orbital periods of both systems have increased. The orbital period change rate of SX Crv has been calculated to be 0.39 s per century, while that of XX Sex has been calculated to be 2.68 s per century. The orbital angular momentum (Jo) o ) determined for both systems is more than 3 times the spin angular momentum (Js), s ), and it can be said that the SX Crv and XX Sex systems are stable. The calculated instability separation ( a ins. ) and instability mass ratio (q ins. ) values for both systems are smaller than those obtained in the analyses, which supports the stability. The estimated ages of the systems are 7.4 Gyr for SX Crv and 3.9 Gyr for XX Sex. logMtot tot - logJ and logTeff- eff - logL diagrams were also interpreted to better understand the evolution of the extreme low mass ratio contact binaries. (c) 2024 COSPAR. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Açıklama
Anahtar Kelimeler
Binaries, Eclipsing- stars, Fundamental parameters- stars, Individuals (SX Crv and XX Sex)
Kaynak
Advances in Space Research
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
74
Sayı
8
