Query : 2019A&A...627A.153I

2019A&A...627A.153I - Astronomy and Astrophysics, volume 627A, 153-153 (2019/7-2)

Absolute dimensions of the low-mass eclipsing binary system NSVS 10653195.


Abstract (from CDS):

Context. Low-mass stars in eclipsing binary systems show radii larger and effective temperatures lower than theoretical stellar models predict for isolated stars with the same masses. Eclipsing binaries with low-mass components are hard to find due to their low luminosity. As a consequence, the analysis of the known low-mass eclipsing systems is key to understand this behavior. Aims. We aim to investigate the mass-radius relation for low-mass stars and the cause of the deviation of the observed radii in low-mass detached eclipsing binary stars (LMDEB) from theoretical stellar models. Methods. We developed a physical model of the LMDEB system NSVS 10653195 to accurately measure the masses and radii of the components. We obtained several high-resolution spectra in order to fit a spectroscopic orbit. Standardized absolute photometry was obtained to measure reliable color indices and to measure the mean Teff of the system in out-of-eclipse phases. We observed and analyzed optical VRI and infrared JK band differential light-curves which were fitted using PHOEBE. A Markov chain Monte-Carlo (MCMC) simulation near the solution found provides robust uncertainties for the fitted parameters. Results. NSVS 10653195 is a detached eclipsing binary composed of two similar stars with masses of M1=0.6402±0.0052M and M2=0.6511±0.0052M and radii of R1=0.687+0.017–0.024R and R2=0.672+0.018–0.022R. Spectral types were estimated to be K6V and K7V. These stars rotate in a circular orbit with an orbital inclination of i=86.22±0.61 degrees and a period of P=0.5607222(2)d. The distance to the system is estimated to be d=135.2+7.6–7.9pc, in excellent agreement with the value from Gaia. If solar metallicity were assumed, the age of the system would be older than log(age)∼8 based on the Mbol-log Teff diagram. Conclusions. NSVS 10653195 is composed of two oversized and active K stars. While their radii is above model predictions their Teff are in better agreement with models.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: fundamental parameters - stars: low-mass - binaries: eclipsing - binaries: spectroscopic - stars: individual: NSVS 10653195

VizieR on-line data: <Available at CDS (J/A+A/627/A153): table1.dat table2.dat table3.dat table7.dat>

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 V* YY Gem BY* 07 34 37.4474327544 +31 52 10.179641496 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 851 0
2 NSVS 10653195 EB* 16 07 27.8650293000 +12 13 59.123390844     12.501     ~ 8 0

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