Computer Science
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.281..199r&link_type=abstract
Nature, vol. 281, Sept. 20, 1979, p. 199, 200.
Computer Science
5
Eclipsing Binary Stars, Gravitational Fields, Gravitational Waves, Stellar Mass Accretion, White Dwarf Stars, Dimensional Measurement, Roche Limit, Stellar Luminosity, Stellar Spectrophotometry
Scientific paper
Determinations of the masses, dimensions and mass exchange rate of the eclipsing cataclysmic binary Z Cha are reported and the mechanism of mass exchange is discussed. Photometric and spectroscopic observations of the eclipses of the center of the accretion disk of the primary and the hot spot (at which accreting matter impacts the disk) and of the radial velocity and accretion disk orbital velocity are used to determine the masses of the primary and the secondary (0.35 and 0.16 solar masses, respectively), the radii of the primary, secondary, hot spot and disk (0.018, 0.19, 0.032 and 0.16 solar radii, respectively) and the orbital separation of the components (0.59 solar radii), which indicate the secondary to be similar to a low-mass main-sequence star and the primary to fit the mass-radius relation of a white dwarf. Rates of mass exchange estimated by determining the luminosity of the hot spot and the accretion disk are shown to be in good agreement with the rates expected for mass accretion as a result of angular momentum loss due to gravitational radiation.
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