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LB 1800 - A bright eclipsing cataclysmic variable and a transient X-ray sourceThe 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.
Document ID
19900048594
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Buckley, D. A. H.
(Mount Stromlo and Siding Spring Observatories, Canberra, Australia; Cape Town, University Rondebosch, Republic of South Africa, United States)
Sullivan, D. J.
(Mount Stromlo and Siding Spring Observatories, Canberra, Australia; Wellington, Victoria University New Zealand)
Remillard, R. A.
(MIT Cambridge, MA, United States)
Tuohy, I. R.
(Mount Stromlo and Siding Spring Observatories Canberra, Australia)
Clark, M.
(Mount John University Observatory, Lake Tekapo, New Zealand)
Date Acquired
August 14, 2013
Publication Date
June 1, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 355
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
90A35649
Funding Number(s)
CONTRACT_GRANT: NAG8-493
CONTRACT_GRANT: NSF AST-86-12572
Distribution Limits
Public
Copyright
Other

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