Mass transfer rates and the soft X-ray excess in AM Herculis binaries

Details Mass transfer rates and the soft X-ray excess in AM Herculis binaries Mass transfer rates and the soft X-ray excess in AM Herculis binaries

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227..205k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, July 1, 1987, p. 205-211.

Astronomy and Astrophysics

Astronomy

40

Binary Stars, Cataclysmic Variables, Mass Flow Rate, Mass Transfer, Radiant Flux Density, X Ray Spectra, Stellar Evolution, Stellar Mass Accretion, Stellar Mass Ejection

Scientific paper

The authors consider the mass transfer rates implied for the AM Her systems by their hard X-ray fluxes alone, assuming that no soft X-ray excess exists. Distance estimates suggest that these rates are at least an order of magnitude lower than is compatible with currently favoured pictures of the secular evolution of cataclysmic variables, and would present severe difficulties for any evolutionary scheme, as the implied mass transfer time-scales would exceed a Hubble time. By contrast, the soft excesses already directly measured for some systems imply transfer rates in rough agreement with those expected.

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