Journal Article

Spectroscopic and photometric study of the eclipsing interacting binary V495 Centauri

J A Rosales Guzmán, R E Mennickent, G Djurašević, I Araya and M Curé

in Monthly Notices of the Royal Astronomical Society

Published on behalf of Royal Astronomical Society

Volume 476, issue 3, pages 3039-3050
ISSN: 0035-8711
Published online January 2018 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1093/mnras/sty224

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Abstract

Double Periodic Variables (DPV) are among the new enigmas of semidetached eclipsing binaries. These are intermediate-mass binaries characterized by a long photometric period lasting on average 33 times the orbital period. We present a spectroscopic and photometric study of the DPV V495 Cen based on new high-resolution spectra and the ASAS V-band light curve. We have determined an improved orbital period of 33.492 ± 0.002 d and a long period of 1283 d. We find a cool evolved star of [math], T2 = 6000 ± 250 K and [math] and a hot companion of [math], T1 = 16960 ± 400 K and [math]. The mid-type B dwarf is surrounded by a concave and geometrically thick disc, of radial extension [math] contributing ∼11 per cent to the total luminosity of the system at the V band. The system is seen under inclination 84[math]8 ± 0[math]6 and it is at a distance d = 2092 ± 104.6 pc. The light-curve analysis suggests that the mass transfer stream impacts the external edge of the disc forming a hot region 11 per cent hotter than the surrounding disc material. The persistent V < R asymmetry of the Hα emission suggests the presence of a wind and the detection of a secondary absorption component in He i lines indicates a possible wind origin in the hotspot region.

Keywords: binaries: general; stars: early-type; stars: emission-line; stars: evolution; stars: mass-loss

Journal Article.  7391 words.  Illustrated.

Subjects: Astronomy and Astrophysics