Precise physical parameters of three late-type eclipsing binary giant stars in the Large Magellanic Cloud

Abstract

Detached eclipsing binaries (DEBs) allow for the possibility of precise characterization of its stellar components. They offer a unique opportunity to derive their physical parameters in a near-model-independent way for a number of systems consisting of late-type giant stars. Here we aim to expand the sample of low-metallicity late-type giant stars with precise parameters determined. We aim to determine the fundamental parameters like the mass, radius, or effective temperature for three long-period late-type eclipsing binaries from the Large Magellanic Cloud: OGLE-LMC-ECL-25304, OGLE-LMC-ECL-28283, and OGLE-IV LMC554.19.81. Subsequently we aim to determine the evolutionary stages of the systems. We fit the light curves from the OGLE project and radial velocity curves from high resolution spectrographs using the Wilson-Devinney code. The spectral analysis was performed with the GSSP code and resulted in the determination of atmospheric parameters such as effective temperatures and metallicities. We used isochrones provided by the MIST models based on the MESA code to derive evolutionary status of the stars. We present the first analysis of three DEBs composed of similar He-burning late-type stars passing through the blue loop. Estimated masses for OGLE-LMC-ECL-29293 (G4III + G4III) are $M_1=2.898\pm 0.031$ and $M_2=3.153\pm 0.038$ $M_{\odot }$, stellar radii are $R_1=19.43\pm 0.31$ and $R_2=19.30\pm 0.31$ $R_{\odot }$. OGLE-LMC-ECL-25304 (G4III + G5III) has stellar masses of $M_1=3.267\pm 0.028$ and $M_2=3.229\pm 0.029$ $M_{\odot }$, radii of $R_1=23.62\pm 0.42$ and $R_2=25.10\pm 0.43$ $R_{\odot }$. OGLE-IV LMC554.19.81 (G2III + G2III) have masses of $M_1=3.165\pm 0.020$ and $M_2=3.184\pm 0.020$ $M_{\odot }$, radii of $R_1=18.86\pm 0.26$ and $R_2=19.64\pm 0.26$ $R_{\odot }$. All masses were determined with a precision better than 2\% and radii better than 1.5\%. The ages of the stars are in the range of 270-341 Myr.

15 pages, 15 figures. Accepted for publication in A&A

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