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The Stellar Mass Ratio of GK Persei

Morales-Rueda, L., Still, M.D., Roche, Paul, Wood, J.H. and Lockley, J. J. 2002. The Stellar Mass Ratio of GK Persei. Monthly Notices of the Royal Astronomical Society 329 , pp. 597-604. 10.1046/j.1365-8711.2002.05013.x

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Abstract

We study the absorption lines present in the spectra of the long-period cataclysmic variable GK Per during its quiescent state, which are associated with the secondary star. By comparing quiescent data with outburst spectra we infer that the donor star appears identical during the two states and the inner face of the secondary star is not noticeably irradiated by flux from the accreting regions. We obtain new values for the radial velocity semi-amplitude of the secondary star, KK ? 120:5 ^ 0:7 kms21, a projected rotational velocity, VK sin i ? 61:5 ^ 11:8 kms21; and consequently a measurement of the stellar mass ratio of GK Per, q ? MK/MWD ? 0:55 ^ 0:21. The inferred white dwarf radial velocities are greater than those measured traditionally using the wings of Doppler-broadened emission lines suspected to originate in an accretion disc, highlighting the unsuitability of emission lines for mass determinations in cataclysmic variables. We determine mass limits for both components in the binary, MK $ 0:48 ^ 0:32M( and MWD $ 0:87 ^ 0:24M(.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Uncontrolled Keywords: binaries: close; stars: fundamental parameters; stars: individual: GK Per;novae, cataclysmic variables
ISSN: 0035-8711
Last Modified: 04 Jun 2017 01:41
URI: http://orca.cf.ac.uk/id/eprint/1644

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