2020AJ....160...49L -
Astron. J., 160, 49-49 (2020/July-0)
The pre-He white dwarfs in eclipsing binaries. I. WASP 0131+28.
LEE J.W., KOO J.-R., HONG K. and PARK J.-H.
Abstract (from CDS):
We report the first BV light curves and high-resolution spectra of the post-mass transfer binary star WASP 0131+28 to study the absolute properties of extremely low-mass white dwarfs. From the observed spectra, the double-lined radial velocities were derived, and the effective temperature and rotational velocity of the brighter, more massive primary were found to be Teff,1=10,000±200 K and v1sini = 55 ± 10 km s–1, respectively. The combined analysis of the Transiting Exoplanet Survey Satellite (TESS) archive data and ours yielded the accurate fundamental parameters of the program target. The masses were derived to about 1.0% accuracy and the radii to 0.6%, or better. The secondary component's parameters of M2=0.200±0.002M☉, R2=0.528±0.003R☉, Teff,2 = 11,186 ± 235 K, and L2=3.9±0.3L☉ are in excellent agreement with the evolutionary sequence for a helium-core white dwarf of mass 0.203 M☉, and indicates that this star is halfway through the constant luminosity phase. The results presented in this article demonstrate that WASP 0131+28 is an EL CVn eclipsing binary in a thin disk, which is formed from the stable Roche-lobe overflow channel and composed of a main-sequence dwarf with a spectral type A0 and a pre-He white dwarf.
Abstract Copyright:
© 2020. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Eclipsing binary stars - Fundamental parameters of stars - CCD photometry - Spectroscopy - Stellar evolution - White dwarf stars
VizieR on-line data:
<Available at CDS (J/AJ/160/49): table1.dat table3.dat>
Simbad objects:
11
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