Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..519m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Oct. 1, 1989, p. 519-531.
Astronomy and Astrophysics
Astronomy
47
Cataclysmic Variables, Chromosphere, Dwarf Novae, Stellar Spectra, Computerized Simulation, Line Spectra, Radial Velocity, Sodium
Scientific paper
The cataclysmic variable IP Pegasi was studied by CCD spectroscopy during decline from outburst, showing narrow chromospheric emission lines from the irradiated face of the red star. The semiamplitude obtained is larger than the true semiamplitude because irradiation from the disk ionizes the Na I on the inner face of the red star and decreases the strength of the Na I doublet on that face. A computer simulation of the secondary radial velocity curve which takes this ionization effect into account provides a true semiamplitude of the secondary motion of 298 + or - 8 km/s. The semiamplitude of the radial velocity curve is expected to be significantly smaller than the absorption line semiamplitude, and it is suggested that this does not occur because the chromospheric emission component is blended near quadrature with the much broader double-peaked disk emission line.
Connon Smith Robert
Friend M. T.
Jones H. P. D.
Martin Jaime San
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