Details

Autor(en) / Beteiligte

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

Titel

Spectroscopic and photometric study of the eclipsing interacting binary V495 Centauri

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2018-05, Vol.476 (3), p.3039-3050

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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 $M_{2}=0.91\pm 0.2\,\text{M}_{\odot}$, T2 = 6000 ± 250 K and $R_{2}=19.3 \pm 0.5\,\text{R}_{\odot}$ and a hot companion of $M_{1}= 5.76\pm 0.3\,\text{M}_{\odot}$, T1 = 16960 ± 400 K and $R=4.5\pm 0.2\,\text{R}_{\odot}$. The mid-type B dwarf is surrounded by a concave and geometrically thick disc, of radial extension $R_{d}= 40.2\pm 1.3\,\text{R}_{\odot}$ contributing ∼11 per cent to the total luminosity of the system at the V band. The system is seen under inclination 84${^{\circ}_{.}}$8 ± 0${^{\circ}_{.}}$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.