Radial Velocity and Line Profile Variations in the Dwarf Nova Em-Cygni

Details Radial Velocity and Line Profile Variations in the Dwarf Nova Em-Cygni Radial Velocity and Line Profile Variations in the Dwarf Nova Em-Cygni

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..696s&link_type=abstract

Astrophysical Journal, Vol.248, P. 696, 1981

Astronomy and Astrophysics

Astrophysics

47

Scientific paper

Spectroscopic observations of the dwarf nova EM Cygni are presented. From these spectra we measure the radial velocity variations of the accretion disk emission lines and the secondary star absorption lines. The emission line profiles show that the accretion disk was very unstable during the nights of observation, leading to uncertainties in the emission line radial velocities. In spite of the uncertainties we can estimate the masses of the accreting white dwarf and the mass-losing secondary star: Mwd = 0.56±00.5Msun and Msec =0.76 ± 0.1 Msun. We find that the secondary star is at least 10% larger than a zero-age main sequence star of the same mass.

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