Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4271h&link_type=abstract
HST Proposal ID #4271
Other
Hst Proposal Id #4271
Scientific paper
Empirical scaling laws among magnetic activity indicators are well established for the sun and other cool stars. Ground-based studies of Balmer and CaII emission suggest that similar relationships may hold for the accretion disks and tidally-locked secondary stars in cataclysmic variables. We propose to test this star-disk connection by using HST to make Doppler maps of MgII and CIV emission in three quiescent dwarf novae. These lines sensitive to chromospheric and transition region temperature regimes are predicted to scale as radius to the -3/2 and -3 respectively in the Keplerian accretion disk. Our experiment tests the hypothesis that dynamo action powers emission lines from accretion disk chromospheres. The disk and secondary star rotate much faster than the stars for which magnetic activity relations have been previously determined. By expanding the study of magnetic activity to higher rotation rates and different geometries, we expect to gain insights into the basic physics that will advance our understanding of dynamos and magnetic activity in a broad context. NOTE: THE TAC CUT THIS PROPOSAL FROM 3 TO 1 OBJECT.
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