Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..609c&link_type=abstract
Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 609-617. Research supported by the Miller Institute for Basic Resear
Astronomy and Astrophysics
Astronomy
92
Binary Stars, Dwarf Stars, Novae, Stellar Radiation, Variable Stars, X Ray Sources, Emission Spectra, Heao 2, Spaceborne Astronomy, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Spectra
Scientific paper
X-ray observations of 12 cataclysmic variable stars using the Einstein Observatory are reported. Nine of these stars, representing all subclasses of cataclysmic variables, were detected. Their fluxes range from 2 x 10 to the -13th to 1 x 10 to the -11th ergs/sq cm-s in the energy interval 0.16-4.5 keV. The spectra of all the sources detected are relatively hard (kT not less than 5 keV). There is no evidence for an ultrasoft emission component (kT of about 50 eV) such as has been observed from the dwarf novae SS Cyg and U Gem during optical outburst. The X-ray and optical fluxes of the objects observed can be understood in terms of differences in mass accretion rate if the accreting stars in these close binary systems possess a weak magnetic field.
Cordova France A.
Mason Keith O.
Nelson Jerry E.
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