The Boundary Layer-White Dwarf Connection: CV White Dwarf Rotation and Line Formation Regions in the Prototype Dwarf Nova U Geminorum

Details The Boundary Layer-White Dwarf Connection: CV White Dwarf Rotation and Line Formation Regions in the Prototype Dwarf Nova U Geminorum The Boundary Layer-White Dwarf Connection: CV White Dwarf Rotation and Line Formation Regions in the Prototype Dwarf Nova U Geminorum

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5412s&link_type=abstract

HST Proposal ID #5412

Other

Hst Proposal Id #5412 Hot Stars, Eruptive B

Scientific paper

The central accreting object in compact binaries and other accreting systems is usually hidden from direct observation, enshrouded by optically thick accretion disks which are opaque to the radiation emitted by the central object as it accretes matter. In the dwarf nova U Gem the underlying white dwarf accreter is clearly exposed in the far UV during dwarf nova quiescence. By probing the white dwarf with the sensitivity and velocity resolution of GHRS, just after the deposition of mass, energy and angular momentum into its envelope by the dwarf nova outburst event and also later in quiescence, we will obtain fundamental information such as: (1) the first rate of rotation of a CV white dwarf and hence the expected temperature and extent of the boundary layer during the high accretion (dwarf nova outburst) episode; (2) the delineation of the lower temperature line formation regions associated with the rotating, average (30-40,000K), photosphere of the white dwarf from the line formation region(s) of higher temperature ion species (e.g. NV 1238,1242) (boundary layer/accretion belt or putative hot corona?) surrounding the white dwarf; (3) the velocity amplitude and hence mass and gravitational redshift of the U Gem white dwarf; (4) the possible presence of persisting (but weaker in quiescence) radiation- driven selective ion wind (5) line profile variations to test physical mech- anisms that control the flow of accreted elements and hence abundance changes (diffusion, mixing, dilution, dredgeup and ongoing

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