Absolute properties of the main-sequence eclipsing binary FM Leo

Authors:

• M. Ratajczak,
• Tomasz Kwiatkowski,
• Aleksander Schwarzenberg-Czerny,
• Wojciech Dimitrow,
• Maciej Robert Konacki,
• K.G. Hełminiak,
• Przemysław Paweł Bartczak,
• Monika Katarzyna Fagas,
• Krzysztof Zbigniew Kamiński,
• P. Kankiewicz,
• Wojciech Borczyk,
• Agata Rożek

Abstract

First spectroscopic and new photometric observations of the eclipsing binary FM Leo are presented. The main aims were to determine the orbital and stellar parameters of the two components and their evolutionary stage. First spectroscopic observations of the system were obtained with the David Dunlap Observatory and Poznań Spectroscopic Telescope spectrographs. The results of the orbital solution from radial velocity curves are combined with those derived from the light-curve analysis (V-band photometry from the All Sky Automated Survey and supplementary observations of eclipses with the 1 and 0.35 m telescopes) to derive orbital and stellar parameters. jktebop, Wilson-Devinney binary modelling codes and a two-dimensional cross-correlation method were applied for the analysis. We find the masses to be M₁= 1.318 ± 0.007 and M₂= 1.287 ± 0.007 M_⊙ and the radii to be R₁= 1.648 ± 0.043 and R₂= 1.511 ± 0.049 R_⊙ for primary and secondary stars, respectively. The evolutionary stage of the system is briefly discussed by comparing physical parameters with current stellar evolution models. We find that the components are located at the main sequence, with an age of about 3 Gyr. © 2010 The Authors. Journal compilation © 2010 RAS.