Other
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983msngr..34...19b&link_type=abstract
The Messenger, vol. 34, p. 19-20
Other
Dwarf Novae:Light Curves, Dwarf Novae:Spectra, Light Curves:Dwarf Novae, Light Curves:Novae, Novae:Light Curves, Novae:Spectra, Spectra:Dwarf Novae, Spectra:Novae
Scientific paper
Among all kinds of stars probably the most spectacular ones are novae, which suddenly increase their brightness up to more than a million times and then fade again in timescales of months or years to their original faintness. In spite of this outstanding, dramatic behaviour these objects have many properties in common with other so-calied cataclysmic variables (CV). From numerous observational and theoretical work we have learned that these particular stars are very close binaries, some with orbital dimensions of the order of our sun's diameter. The systems consist of a late-type secondary filling its Roche lobe, and a very compact hot primary, which is supposed to be a white dwarf or even a neutron star. Matter flowing from the expanding cooler companion towards the primary normally cannot reach its surface directly due to its excess angular momentum. It is therefore stored first in a rotating accretion disko An important subgroup of the CVs are the dwarf novae which in contrary to novae show quasiperiodic outbursts on a timescale of days with much smaller amplitudes.
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