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Publication . Presentation . Article . Other literature type . Preprint . Conference object . 2021 . Embargo end date: 01 Jan 2020

Analysis of eclipsing binaries in multiple stellar systems: the case of V1200 Centauri

F. Marcadon; Krzysztof G. Hełminiak; J. P. Marques; Rafał Pawłaszek; P. Sybilski; S. K. Kozłowski; M. Ratajczak; +1 Authors
Open Access

We present a new analysis of the multiple star V1200 Centauri based on the most recent observations for this system. We used the photometric observations from the Solaris network and the TESS telescope, combined with the new radial velocities from the CHIRON spectrograph and those published in the literature. We confirmed that V1200 Cen consists of a 2.5-day eclipsing binary orbited by a third body. We derived the parameters of the eclipsing components, which are $M_{Aa} = 1.393\pm0.018\,$M$_\odot$, $R_{Aa} = 1.407\pm0.014\,$R$_\odot$ and $T_{{\rm eff},Aa} = 6\,588\pm58\,$K for the primary, and $M_{Ab} = 0.863\,3\pm0.008\,1\,$M$_\odot$, $R_{Ab} = 1.154\pm0.014\,$R$_\odot$ and $T_{{\rm eff},Ab} = 4\,475\pm68\,$K for the secondary. Regarding the third body, we obtained significantly different results than previously published. The period of the outer orbit is found to be 180.4 days, implying a minimum mass $M_B = 0.871\pm0.020\,$M$_\odot$. Thus, we argue that V1200 Cen is a quadruple system with a secondary pair composed of two low-mass stars. Finally, we determined the ages of each eclipsing component using two evolution codes, namely MESA and CESTAM. We obtained ages of 16-18.5$\,$Myr and 5.5-7$\,$Myr for the primary and the secondary, respectively. In particular, the secondary appears larger and hotter than predicted at the age of the primary. We concluded that dynamical and tidal interactions occurring in multiples may alter the stellar properties and explain the apparent non-coevality of V1200 Centauri.

Comment: Accepted for publication in MNRAS. 17 pages, 7 tables and 11 figures

Subjects by Vocabulary

Microsoft Academic Graph classification: Third body Binary number Orbit Astrophysics Star (game theory) Stars Physics


Solar and Stellar Astrophysics (astro-ph.SR), FOS: Physical sciences, Astrophysics - Solar and Stellar Astrophysics, Stellar Astrophysics, Space and Planetary Science, Astronomy and Astrophysics

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