Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9231b&link_type=abstract
HST Proposal ID #9231
Computer Science
Hst Proposal Id #9231
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. In Cycle 8, we obtained observations at two visits to VV Cep, as well as comparison spectra of the similar, but less interacting {and non-eclipsing} binaries KQ Pup and HR 8164. For Cycles 9 & 10, we continue our spectroscopic monitoring of the egress from eclipse by proposing to obtain two additional visits each cycle. This project is a continuation of the Cycle 7 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. The 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 impleme obtain relative orbit information, and accurate stellar masses.
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