BG Tri: an example of a low-inclination RW Sex-type nova-like. Issue 1 (20th March 2021)

• Record Type: Journal Article
• Authors: Hernández, M S; Tovmassian, G; Zharikov, S; Gänsicke, B T; Steeghs, D; Aungwerojwit, A; Rodríguez-Gil, P
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 503:Issue 1(2021)
• Page Start: 1431
• Page End: 1441
• Publication Date: 2021-03-20
• Subjects: cataclysmic variables -- dwarf novae -- white dwarf -- stars: individual: BG Tri; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab301
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We analyse a wealth of optical spectroscopic and photometric observations of the bright ( V = 11.9) cataclysmic variable BG Tri. The Gaia DR2 parallax gives a distance d = 334(8) pc to the source, making the object one of the intrinsically brightest nova-like variables seen under a low orbital inclination angle. Time-resolved spectroscopic observations revealed an orbital period of $P_{\rm {orb}}=3.8028(24)$ h. Its spectroscopic characteristics resemble RW Sex and similar nova-like variables. We disentangled the H α emission line into two components, and show that one component forms on the irradiated face of the secondary star. We suggest that the other one originates at a disc outflow area adjacent to the L3 point.