Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982saosr.392b.125s&link_type=abstract
Smithson. Astrophys. Obs., Spec. Rep., No. 392, Vol. II, p. 125 - 133
Astronomy and Astrophysics
Astrophysics
Astronomical Spectroscopy, Binary Stars, Giant Stars, Stellar Spectra, Ultraviolet Spectra, X Ray Spectra, Barium, Emission Spectra, Iue, Lyman Alpha Radiation, Stellar Coronas, Stellar Winds
Scientific paper
Both IUE short and long wavelength exposures of the 56 Peg system are discussed. This mild barium star has an X-ray luminosity of 3 x 10 to the 31st power ergs/1, comparable to the rapidly rotating RS CVn binary systems, yet lies in a region of the HR diagram where stellar X-rays are generally not observed. This cool, bright giant is not a rapid rotator and the key to understanding its emission lies in the recent discovery of its white dwarf companion. Accretion onto the white dwarf of approximately 0.1% of the stellar wind of the primary is sufficient to power an X-ray source of the observed luminosity. Reprocessing of the X-rays in the cool dense stellar wind explains the origin of the UV emission line spectrum, and may explain the time varying asymmetry of the Mg 2 kappa line profile that is observed. Graphs which show observed fluxes and wavelengths are discussed.
Basri Gibor
Helfand David
Linsky Jeffrey L.
Schindler Michael
Stencel Robert E.
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