BG Tri: an example of a low-inclination RW Sex-type nova-like

M. S. Hernandez, Gaghik H. Tovmassian, Sergey V. Zharikov, Boris T. Gänsicke, Danny T. H. Steeghs, A. Aungwerojwit, P. Rodríguez-Gil

2021

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DOI 10.1093/mnras/stab301

Data confidence 70 medium

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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.