Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980msngr..21...16r&link_type=abstract
The Messenger, No.21, P. 16, 1980
Astronomy and Astrophysics
Astrophysics
6
Scientific paper
Cataclysmic variables (CV's) is the common name of a subgroup of eruptive variables consisting of the classical novae, the dwarf novae, the recurrent novae and of the nova-like objects. Since Kraft's pioneering investigation about twenty years aga (Kraft, R. P.: 1973, Adv. Astron. Astrophys. 2, 43) we know that probably all of the CV's are close binaries. However among the roughly 500 CV's known at present, only for about 50 objects has the bi nary nature been established by observations. Hereafter these objects will be referred to as cataclysmic binaries (CB's). From the histogram of their orbital periods, shown in Fig. 1, it is seen that CB's have extremely short orbital periods, typically only a few hours. Moreover the histogram shows a remarkable gap of orbital periods in the range between about 2 and 3 hours. This gap has been found to be statistically highly significant. Apparently CB's are divided into two subgroups, i. e. into the ultrashort- period CB's (hereafter USPCB's) with orbital periods P <= 2h and into the longer-period CB's (hereafter LPCB's) with orbital periods P >= 3h
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