Computer Science – Sound
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6688m&link_type=abstract
HST Proposal ID #6688
Computer Science
Sound
Hst Proposal Id #6688 Binaries And Star Fo
Scientific paper
We will take high-speed UV spectroscopy of the dwarf novaHS1804+6753 to find and measure the role of supersonic turbulencein its outer accretion disk. With HST observations of theeclipsing dwarf nova OY Car we have discovered a sensitiveprobe of physical conditions in its accretion disk. This isbased upon model atmosphere fits to strong veiling of thewhite dwarf by a mass of FeII lines at ultravioletwavelengths. Suprisingly we found supersonic microturblence atMach ~ 6 in the absorbing gas. While this would normally beexpected to dissipate in shocks, recent theoretical worksuggests that the disk can become strongly magnetic in whichcase it is the Alfven rather than sound speed which isrelevant. The result needs to be confirmed on other targets.Other systems are also needed to study vertical stratificationin the disk as a single object only gives us one line ofsight. Eclipsing dwarf novae are of particular interest as theeclipse allows the component spectra to be separated andbecause the line-of-sight is likely to pass through the disk.Therefore we propose to observe a newly discovered andrelatively bright eclipsing dwarf nova named HS1804+6753. At 5hours HS1804+6753 has a much longer period than any other suitabletarget and there are signs that it has a particularly highinclination and therefore it will provide an extreme test ofour model.
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