Quest for the Donor Star in the Magnetic Precataclysmic Variable V1082 Sgr. (arXiv:1811.08049v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Tovmassian_G/0/1/0/all/0/1">G. Tovmassian</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gonzalez_J/0/1/0/all/0/1">J. F. Gonzalez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hernandez_M/0/1/0/all/0/1">M.-S. Hernandez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gonzalez_Buitrago_D/0/1/0/all/0/1">D. Gonzalez-Buitrago</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zharikov_S/0/1/0/all/0/1">S. Zharikov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Santisteban_J/0/1/0/all/0/1">J. V. Hernandez Santisteban</a>

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), 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 (> 10e-9 Msun/yr) mass transfer and
mass accretion rate in a detached binary via stellar wind and magnetic
coupling.

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), 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 (> 10e-9 Msun/yr) mass transfer and
mass accretion rate in a detached binary via stellar wind and magnetic
coupling.

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