Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259p..23l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 3, p. 23P-26P.
Physics
114
Accretion Disks, Dwarf Novae, Stellar Magnetic Fields, Stellar Spectrophotometry, Ultraviolet Radiation, White Dwarf Stars, Stellar Models, Stellar Physics, Time Lag
Scientific paper
We investigate the effect on the properties of the outbursts of a dwarf nova (in the disk instability model) of the central white dwarf having a weak (about 10,000 G) magnetic field. We find that in quiescence the inner regions of the disk are evacuated by the presence of the field. This implies that at the beginning of the outburst there is a delay before the hotter inner disk regions are filled and radiating, and thus the optical flux can rise 12 h or so before the ultraviolet flux. During outburst the effect of the field on the disk is negligible. Thus the presence of such a weak field would be hard to detect directly by, for example, looking for coherent pulsations in the emitted light.
Livio Mario
Pringle James E.
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