LB 1800 - A bright eclipsing cataclysmic variable and a transient X-ray source

Details LB 1800 - A bright eclipsing cataclysmic variable and a transient X-ray source LB 1800 - A bright eclipsing cataclysmic variable and a transient X-ray source

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...355..617b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 355, June 1, 1990, p. 617-626. Research supported by New Zealand University

Astronomy and Astrophysics

Astrophysics

20

Cataclysmic Variables, Eclipsing Binary Stars, X Ray Sources, Balmer Series, Dwarf Novae, Light Curve, Spectral Line Width, Stellar Luminosity, White Dwarf Stars

Scientific paper

The star LB 1800 has been discovered to be a 13th mag high-excitation cataclysmic variable exhibiting novalike characteristics and partial eclipses in its light curve. It has subsequently been identified as the optical counterpart of the transient hard X-ray source 4U 0608-49 following analysis of HEAO 1 data. Both the radial velocity and photometric variations have a period of 5.56 hr, while the K-velocity of the relatively uncomplicated radial velocity curves is 134 + or - 9 km/s, leading to a mass function of 0.058 + or - 0.003 solar mass. The dynamical and eclipse solutions point to an orbital inclination of 87 deg + or - 3 deg and a mass ratio of 0.46 + or - 0.04 for the empirical secondary mass 0.55 solar mass. The implied white dwarf mass is therefore quite high at about 1.2 solar mass. The disk size, from timings of first and last contact, was estimated to be very close to that of the secondary star. Phase-dependent, double-peak emission lines are sometimes observed. It is argued that the orbital variations in the relative strengths of the red and blue peaks arise from changing hot-spot visibility.

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