Spectral and Timing Investigations of Dwarf Novae Selected in Hard X-Rays

Details Spectral and Timing Investigations of Dwarf Novae Selected in Hard X-Rays Spectral and Timing Investigations of Dwarf Novae Selected in Hard X-Rays

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stin...0017682t&link_type=abstract

Technical Report, MIT-OSP-6703800 Center for Space Research

Astronomy and Astrophysics

Astronomy

Dwarf Novae, Cataclysmic Variables, White Dwarf Stars, X Ray Sources, Heao 1, Sky Surveys (Astronomy), X Ray Timing Explorer, Magnetic Fields, Unsteady Flow

Scientific paper

There are 9 dwarf novae (DN) among the 43 cataclysmic variables (accreting white dwarfs in close binary systems) that were detected during the HEAO-1 all-sky X-ray survey (1977-1979). On the other hand, there are roughly one hundred dwarf novae that are closer and/or optically brighter and yet they were not detected as hard X-ray sources. Two of the HEAO-1 DN show evidence for X-ray pulsations that imply strong magnetic fields on the white dwarf surface, and magnetic CVs are known to be strong X-ray sources. However, substantial flux in hard X-rays may be caused by non-magnetic effects, such as an optically thin boundary layer near a massive white dwarf. We proposed RXTE observations to measure plasma temperatures and to search for X-ray pulsations. The observations would distinguish whether these DN belong to one of (rare) magnetic subclasses. For those that do not show pulsations, the observations support efforts to define empirical relations between X-ray temperature, the accretion rate, and the mass of the white dwarf. The latter is determined via optical studies of the dynamics of the binary constituents.

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