Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245.1035y&link_type=abstract
Astrophysical Journal, Part 1, vol. 245, May 1, 1981, p. 1035-1042.
Astronomy and Astrophysics
Astrophysics
79
Dwarf Stars, Eclipsing Binary Stars, Novae, Stellar Spectra, Stellar Spectrophotometry, Balmer Series, Cassiopeia Constellation, Emission Spectra, Helium, Light Curve, Line Spectra, Radial Velocity, Spectrum Analysis, Stellar Motions, Vortices
Scientific paper
The sixteenth magnitude cataclysmic binary HT Cassiopeiae has been observed at 2.3 Å spectral resolution and 75 s time resolution in the region 3980-5050. Three orbits and three eclipses of this 1h46m binary have been covered. We find: (i) strong Balmer and He I emission. The lines are double peaked, 2800 km s-1 wide, and the central absorption dip reaches down to the continuum in He I. The K velocity of the Balmer lines is 115 km s-1. The velocity phase is offset from the eclipse by 30° and cannot be explained by the &wave effect. (ii) Eclipses of the emission lines show that mW = 0.53Msun, mR = 0.19 Msun(q = 2.8), and α = 0.66 Rsun. The brevity of the eclipse indicates i = 76°. (iii) The strong wings on the emission lines require a disk line emissivity that increases toward small radii as r-3/2.
Schneider David P.
Shectman Stephen A.
Young Patrick
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