Quest for the donor star in the magnetic precataclysmic variable V1082 Sgr
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We obtained high-resolution spectra and multicolor photometry of V1082 Sgr to study the donor star in this 20.8 hr orbital period binary, which is assumed to be a detached system. We measured the rotational velocity (v sin i = 26.5 ± 2.0 km s−1), which, coupled with the constraints on the white dwarf mass from the X-ray spectroscopy, leads to the conclusion that the donor star barely fills 70% of its corresponding Roche lobe radius. It appears to be a slightly evolved K2-type star. This conclusion was further supported by a recently published distance to the binary system measured by the Gaia mission. At the same time, it becomes difficult to explain a very high (>10−9 M⊙ yr-1 ) mass transfer and mass accretion rate in a detached binary via stellar wind and magnetic coupling.
Tovmassian , G , González , J F , Hernández , M-S , González–Buitrago , D , Zharikov , S & Hernández Santisteban , J V 2018 , ' Quest for the donor star in the magnetic precataclysmic variable V1082 Sgr ' , Astrophysical Journal , vol. 869 , no. 1 , 22 . https://doi.org/10.3847/1538-4357/aaec02
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