A Turnoff Detached Binary Star V568 Lyr in the Kepler Field of the Oldest Open Cluster (NGC 6791) in the Galaxy

Abstract

We present the Kepler photometric light-variation analysis of the late-type double-lined binary system V568 Lyr that is in the field of the high metallicity old open cluster NGC 6791. The radial velocity and the high-quality short-cadence light curve of the system are analysed simultaneously. The masses, radii and luminosities of the component stars are $M_1=1.0886\pm 0.0031M\odot$, $M_2=0.8292\pm 0.0026M\odot$, $R_1=1.4203\pm 0.0058R\odot$, $R_2=0.7997\pm 0.0015R\odot$, $L_1=1.85\pm 0.15L\odot$, $L_2=0.292\pm 0.018L\odot$ and their separation is $a=31.060\pm 0.002R\odot$. The distance to NGC 6791 is determined to be $4.260\pm 0.290$kpc by analysis of this binary system. We fit the components of this well-detached binary system with evolution models made with the Cambridge STARS and TWIN codes to test low-mass binary star evolution. We find a good fit with a metallicity of $Z=0.04$ and an age of $7.704$Gyr. The standard tidal dissipation, included in TWIN is insufficient to arrive at the observed circular orbit unless it formed rather circular to begin with.

6 pages, 4 figures, accepted for publication in MNRAS

References in corpus (9)

• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Reaching the End of the White Dwarf Cooling Sequence in NGC 6791
• A new standard: Age and distance for the open cluster NGC 6791 from the eclipsing binary member V20
• High resolution infrared spectroscopy of the old open cluster NGC6791
• The Puzzling White Dwarf Cooling Sequence in NGC6791: A Simple Solution
• Searching for Chemical Signatures of Multiple Stellar Populations in the Old, Massive Open Cluster NGC 6791
• A New Look at the Old Star Cluster NGC 6791
• Variable stars in the open cluster NGC 6791 and its surrounding field
• The Old, Super-Metal-Rich Open Cluster, NGC 6791 - Elemental Abundances in Turn-off Stars from Keck/HIRES Spectra

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