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Cataclysmic variables and the amplitude-cycle length relationship

✍ Scribed by G. A. Richter

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
912 KB
Volume
307
Category
Article
ISSN
0004-6337

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✦ Synopsis

Zentralinstitut far Astrophysik der Akadcniic der Wissenschaftcn der DDH With 3 figures (Received 1985 Deccnibcr 5) After a survey of the latcst statc of knowledgc on cataclysmic variables in general (Clrayter I ) and recurrent novae in particular (Chapter z ) , the amplitude-cycle length relationship (A -C relation) is redcrivcd (Chapter 3) after statistical correction for published incorrect values of C. While the A-C relationship of dwarf novac is of the form A = -0.40 4-2.50 log C, it is, prcsuniably for physical reasons less sharply defined for the few known recurrent novac. Nach einem ~berblick Uber den nlodernen Stand dcr Kenntnis der kataklysniixhen Veranderlichen ini allgenieinen (Kapitel I) und der rekurricrenden Novae im bcsonderen (Kapitel 2) wird in Kapitel 3 die Amplitude-Zyklenlangen-Beziehung (A -C-Relation) nach statistischer Korrektur fehlerhaftcr publiziertcr Werte fnr C neu abgeleitet. Wahrend die Zwergnovae eincr gut definierten Relation der Vorm A = -0.40 + 2.50 log C gehorchcn. ist fur dic wenigen bckanntcn eclitcn rckurricrenden Novae aus physikalischen GrIinden die A -C-htiehung wescntlich sclilcchtcr dcfinicrt.

Cataclysmic variables : definition and model

The term "cataclysmic variable" was invented for certain types of variable stars by PAYNE-GAPOSCHKIN and GAPOSCHKIN (1938) to express the fact (which has been confirmed by modern theories) that these objects are, from time to time at least, deluged with mass and energy, which, when happening abruptly, may have catastrophic effects.

Those authors counted stars with the following types of variability among the cataclysmic variables: SS Cygni stars (U Geminorum stars) in the broadest sense, novae, supernovae, and R Coronae Borealis stars.

Nowadays the supernovae and R Coronae Borealis stars are no longer classed as cataclysmic variables since their variability is due to wholly different causes, even though probably tlJe socalled type I supernovae and perhaps also the R Coronae Borealis stars are final stages of certain types of cataclysmic variables (see, e. g.,

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