Spectroscopic and photometric study of the eclipsing interacting binary V495 Centauri

Abstract

Double Periodic Variables (DPV) are among the new enigmas of semi-detached 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 $33.492\pm 0.002$ d and a long period of 1283 d. We find a cool evolved star of $M_2=0.91\pm 0.2M_{\odot }$, $T_2=6000\pm 250K$ and $R_2=19.3\pm 0.5R_{\odot }$ and a hot companion of $M_1=5.76\pm 0.3M_{\odot }$, $T_1=16960\pm 400K$ and $R=4.5\pm 0.2R_{\odot }$. The mid-type B dwarf is surrounded by a concave and geometrically thick disc, of radial extension $R_d=40.2\pm 1.3R_{\odot }$ contributing $\sim$ 11 percent to the total luminosity of the system at the V band. The system is seen under inclination $84.{}^{\circ }8$ $\pm$ $0.{}^{\circ }6$ and it is at a distance $d=2092\pm 104.6$ pc. The light curve analysis suggests that the mass transfer stream impacts the external edge of the disc forming a hot region 11 % hotter than the surrounding disc material. The persistent $V<R$ asymmetry of the H$\alpha$ 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.

References in corpus (11)

• VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
• The incidence of stellar mergers and mass gainers among massive stars
• Spin-up and hot spots can drive mass out of a binary
• Non-conservative evolution in Algols: where is the matter?
• Morphology of the Interaction Between the Stream and Cool Accretion Disk in a Semi-detached Binary Systems
• The eclipsing LMC star OGLE05155332--6925581: a clue for Double Periodic Variables
• A dynamo mechanism as the potential origin of the long cycle in Double Periodic Variables
• Fundamental parameters of the close interacting binary HD170582 and its luminous accretion disc
• Doppler tomography of the Double Periodic Variable HD 170582 at low and high stage
• Fundamental stellar and accretion disc parameters of the eclipsing binary DQ Velorum
• Exploring the long-term variability and evolutionary stage of the interacting binary DQ Velorum

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• Evolutionary process of the interacting binary V495 Centauri
• V4142 Sgr: a Double Periodic Variable with an accretor surrounded by the accretion-disk's atmosphere
• Stellar and accretion disk parameters of the close binary HD 50526
• Everything that glitters is not gold: V1315 Cas is not a dormant black hole
• Cyclic light variations and accretion disk evolution in the LMC eclipsing binary OGLE-LMC-DPV-062
• Long Photometric Cycles in Double Periodic Variables from Nodal Precession of a Tilted Accretion Disk