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

doi:10.3847/1538-4357/aaec02

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

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	22
Number of pages	10
Journal	Astrophysical Journal
Volume	869
Issue number	1
Early online date	7 Dec 2018
DOIs	https://doi.org/10.3847/1538-4357/aaec02
Publication status	Published - 10 Dec 2018

Keywords

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

Access to Document

10.3847/1538-4357/aaec02

Tovmassian_2018_ApJ_869_22
Copyright © 2018 American Astronomical Society. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.3847/1538-4357/aaec02
Final published version, 1.63 MB

Cite this

@article{7ddefc5fc1b04cd5bdaca0845d085275,

title = "Quest for the donor star in the magnetic precataclysmic variable V1082 Sgr",

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.",

keywords = "Binaries: close, Novae, Cataclysmic variables, Stars: individual: V1082 Sgr, Star: rotation, Stars: winds, Outflows",

author = "G. Tovmassian and Gonz{\'a}lez, {J. F.} and M.-S. Hern{\'a}ndez and D. Gonz{\'a}lez–Buitrago and S. Zharikov and {Hern{\'a}ndez Santisteban}, {J. V.}",

year = "2018",

month = dec,

day = "10",

doi = "10.3847/1538-4357/aaec02",

language = "English",

volume = "869",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

TY - JOUR

T1 - Quest for the donor star in the magnetic precataclysmic variable V1082 Sgr

AU - Tovmassian, G.

AU - González, J. F.

AU - Hernández, M.-S.

AU - González–Buitrago, D.

AU - Zharikov, S.

AU - Hernández Santisteban, J. V.

PY - 2018/12/10

Y1 - 2018/12/10

N2 - 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.

AB - 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.

KW - Binaries: close

KW - Novae

KW - Cataclysmic variables

KW - Stars: individual: V1082 Sgr

KW - Star: rotation

KW - Stars: winds

KW - Outflows

U2 - 10.3847/1538-4357/aaec02

DO - 10.3847/1538-4357/aaec02

M3 - Article

SN - 0004-637X

VL - 869

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 22

ER -

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

Abstract

Keywords

Access to Document

Fingerprint

Cite this