J A Rosales GuzmánR E MennickentG DjuraševićI ArayaCure, MichelMichelCure2025-12-072025-12-072018-01-2610.1093/mnras/sty2242-s2.0-85052527245https://cris-uv-2.scimago.es/handle/123456789/7728WOS:000430944100014Double Periodic Variables (DPV) are among the new enigmas of semi-detached\neclipsing binaries. These are intermediate-mass binaries characterized by a\nlong photometric period lasting on average 33 times the orbital period. We\npresent a spectroscopic and photometric study of the DPV V495 Cen based on new\nhigh-resolution spectra and the ASAS V-band light curve. We have determined an\nimproved orbital period of $33.492 \\pm 0.002$ d and a long period of 1283 d. We\nfind a cool evolved star of $M_{2}=0.91\\pm 0.2 M_{\\odot}$, $T_{2}= 6000\\pm 250\nK$ and $R_{2}=19.3 \\pm 0.5 R_{\\odot}$ and a hot companion of $M_{1}= 5.76\\pm\n0.3 M_{\\odot}$, $T_{1}=16960\\pm 400 K$ and $R=4.5\\pm0.2 R_{\\odot}$. The\nmid-type B dwarf is surrounded by a concave and geometrically thick disc, of\nradial extension $R_{d}= 40.2\\pm 1.3 R_{\\odot}$ contributing $\\sim$ 11 percent\nto the total luminosity of the system at the V band. The system is seen under\ninclination $84.\\!\\!^{\\circ}8$ $\\pm$ $0.\\!\\!^{\\circ}6$ and it is at a distance\n$d= 2092 \\pm 104.6$ pc. The light curve analysis suggests that the mass\ntransfer stream impacts the external edge of the disc forming a hot region 11 %\nhotter than the surrounding disc material. The persistent $V<R$ asymmetry of\nthe H$\\alpha$ emission suggests the presence of a wind and the detection of a\nsecondary absorption component in He I lines indicates a possible wind origin\nin the hotspot region.\nenacceso abiertoAstronomy And AstrophysicsSpace And Planetary Sciencearticle