The Pre-He White Dwarfs in Eclipsing Binaries. III. WASP 1625-04

Abstract

1SWASP J162545.15-043027.9 (WASP 1625-04) has been announced as one of EL CVn candidates showing total primary eclipses and ellipsoidal variations. This paper presents the absolute properties of the binary star, based on our high-resolution spectroscopy conducted from 2015 through 2020. From the spectral analysis, the radial velocities (RVs) for both components were obtained with the effective temperature $T_{\mathrm{eff},1}=8990\pm 200$ K and the rotational rate $v_1\sin$$i=53\pm 5$ km s${}^{-1}$ for the more massive primary. The RV measurements were analyzed with archival WASP photometry. From the modelling we obtained: $M_1=1.745\pm 0.013$ M${}_{\odot }$, $M_2=0.187\pm 0.002$ M${}_{\odot }$, $R_1=1.626\pm 0.008$ M${}_{\odot }$, $R_2=0.290\pm 0.003$ M${}_{\odot }$, $L_1=15.5\pm 1.4$ L${}_{\odot }$, and $L_2=1.84\pm 0.16$ L${}_{\odot }$. In the Hertzsprung-Russell diagram, WASP 1625-04 A lies on the zero-age main sequence and its companion accords well with the helium-core white dwarf models of 0.19 M${}_{\odot }$ in the constant luminosity phase. Our improved results demonstrate that WASP 1625-04 is a typical EL CVn-type binary with a low mass ratio and $M_2$ combination in the thin-disk population and is the product of the stable, non-conservative mass transfer of the precursor binary.

arXiv comment12 pages, including 5 figures and 4 tables, accepted for publication in MNRAS

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