Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..681h&link_type=abstract
Astrophysical Journal, Part 1, vol. 252, Jan. 15, 1982, p. 681-689.
Astronomy and Astrophysics
Astrophysics
33
Eclipsing Binary Stars, Emission Spectra, Light Curve, Stellar Spectrophotometry, Variable Stars, White Dwarf Stars, Brightness, Computerized Simulation, Line Spectra, Radial Velocity, Roche Limit, Stellar Spectra
Scientific paper
Photometry and spectroscopy of a new cataclysmic variable star, Lanning 10 are presented. The star is shown to be an eclipsing binary with a 7h 42m orbital period. Blue flickering is observed to occur on a time scale of 10 minutes. The light curve is analyzed with a numerical simulation of the eclipse of the accretion disk by the lobe-filling star. The disk nearly spans the Roche lobe of the white dwarf, and its surface brightness is a steep function of radius. Spectra show broad H alpha and He I 6678 A emission lines from the accretion disk and a weak absorption feature from the red dwarf. Radial velocity measurements of the H alpha emission line vary systematically with binary phase. The observed velocity amplitude 240 km/s, gives the mass function 0.46 solar masses. A phase shift of the velocity curve relative to the eclipse ephemeris indicates that a brightness asymmetry exists in the inner parts of the disk.
Gomer Richard H.
Horne Keith
Lanning Howard H.
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