Alternating cycle durations in dwarf novae

Details Alternating cycle durations in dwarf novae Alternating cycle durations in dwarf novae

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.169..237a&link_type=abstract

(IAU, European Regional Astronomy Meeting on New Windows to the Universe, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics a

Astronomy and Astrophysics

Astrophysics

8

Astronomical Photometry, Binary Stars, Cataclysmic Variables, Dwarf Novae, Periodic Variations, Least Squares Method, Random Processes, Solar Activity

Scientific paper

The cycle duration C in some dwarf novae underwent abrupt significant changes, as was found using new photometric data and the published moments of maxima. For the analysis, the DMRT method (Dumont et al., 1978) and a least-squares (LS) routine were used. The DMRT method is more appropriate for a search for mean period, if the cycle numeration is unknown. Such changes may be possibly explained by a solar-type activity of convective secondary stars in cataclysmic binaries. However, the abrupt character of the changes of C (i.e., the time of switchings from one cycle to another is sufficiently small compared with the lifetime of a given cycle) is an observational puzzle which is to be interpreted theoretically.

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