Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8257b&link_type=abstract
HST Proposal ID #8257
Computer Science
Hst Proposal Id #8257 Cool Stars
Scientific paper
We propose to obtain STIS and FGS1R observations of the long- period {20.3 yrs} eclipsing binary VV Cephei {M2 Iab + B0} as it continues to emerge from chromospheric eclipse. We will also obtain comparison spectra of the similar, but less interacting {and non-eclipsing} binaries KQ Pup and HR 8164. This project is a continuation of the Cycle 7 medium length program ``The 1997/98 Eclipse of VV Cephei'' {GO-7269}, which used the STIS high resolution echelle modes to probe the chromosphere of the M supergiant primary. This is done by observing the absorption spectrum of the primary's chromosphere, which appears superimposed upon the companion's early-type continuum. Repeated monitoring of the evolution of the chromospheric absorption spectrum during egress from total eclipse permits the construction of an empirical model of the chromosphere and wind of the M2 supergiant. VV Cep is unique among eclipsing binaries in being sufficiently bright for high resolution spectroscopy. Th e proposed STIS observations will probe the wind acceleration region; obtaining empirical information here is of crucial importance in understanding the nature of energy and momentum deposition in these cool winds. In addition, we will observe VV Cep with the newly implemented FGS1R in TRANSFER mode in order to obtain relative orbit information, and accurate stellar masses.
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