Quest for the donor star in the magnetic precataclysmic variable V1082 Sgr

G. Tovmassian, J. F. González, M.-S. Hernández, D. González–Buitrago, S. Zharikov, J. V. Hernández Santisteban

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4 Citations (Scopus)

Abstract

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.
Original languageEnglish
Article number22
Number of pages10
JournalAstrophysical Journal
Volume869
Issue number1
Early online date7 Dec 2018
DOIs
Publication statusPublished - 10 Dec 2018

Keywords

  • Binaries: close
  • Novae
  • Cataclysmic variables
  • Stars: individual: V1082 Sgr
  • Star: rotation
  • Stars: winds
  • Outflows

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