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Dissecting the donor star in the eclipsing polar HU Aquarii

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Schwope, A. D., Horne, K., Steeghs, D. and Still, M.. (2011) Dissecting the donor star in the eclipsing polar HU Aquarii. Astronomy & Astrophysics, Vol.531 . Article A34. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/201016373

Abstract

Medium-resolution spectroscopic observations with full phase coverage of the eclipsing polar HU Aqr are presented. Na I absorption and Ca II emission lines are used to trace the secondary star. While the Na I lines seem to have contributions from both hemispheres of the donor star, the Ca II lines were found to originate from the irradiated part of its surface alone. An irradiation model was applied and the irradiation-weighted radial velocity amplitude was used to determine the mass ratio Q = M(WD)/M(2) = 4.58 +/- 0.20. When combined with high-speed photometric low-state eclipse light curves, the white dwarf mass is constrained to 0.75 < M(WD)/M(circle dot) < 0.84 with a best-fit value of M(WD) = (0.80 +/- 0.04) M(circle dot), and M(2) = (0.18 +/- 0.06) M(circle dot) at an orbital inclination of i = 87(-0.5)(o+0.8).

Item Type:

Journal Article

Subjects:

Q Science > QB Astronomy

Divisions:

Faculty of Science > Physics

Library of Congress Subject Headings (LCSH):

Eclipsing binaries, Variable stars

Journal or Publication Title:

Astronomy & Astrophysics

Publisher:

E D P Sciences

ISSN:

0004-6361

Official Date:

2011

Dates:

Date	Event
2011	Published

Volume:

Vol.531

Page Range:

Article A34

Identification Number:

10.1051/0004-6361/201016373

Status:

Peer Reviewed

Publication Status:

Published

Access rights to Published version:

Restricted or Subscription Access

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