2022MNRAS.511..654L -
Mon. Not. R. Astron. Soc., 511, 654-661 (2022/March-3)
The pre-He white dwarfs in eclipsing binaries - III. WASP 1625-04.
LEE J.W., HONG K. and PARK J.-H.
Abstract (from CDS):
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_eff, 1_ = 8990 ± 200 K and the rotational rate v1sini=53±5 km s–1 for the more massive primary. The RV measurements were analysed with archival WASP photometry. From the modelling we obtained: M1 = 1.745 ± 0.013 M☉, M2 = 0.187 ± 0.002 M☉, R1 = 1.626 ± 0.008 M☉, R2 = 0.290 ± 0.003 M☉, L1 = 15.5 ± 1.4 L☉, and L2 = 1.84 ± 0.16 L☉. 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☉ 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 M2 combination in the thin-disc population and is the product of the stable, non-conservative mass transfer of the precursor binary.
Abstract Copyright:
© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society
Journal keyword(s):
binaries: eclipsing - binaries: spectroscopic - stars: fundamental parameters - stars: individual: (1SWASP J162545.15-043027.9)
Simbad objects:
9
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2022MNRAS.511..654L and select 'bookmark this link' or equivalent in the popup menu