Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6515b&link_type=abstract
HST Proposal ID #6515
Computer Science
Hst Proposal Id #6515 Cool Stars
Scientific paper
Zeta Aur is a long period (972 day) binary containing a Ksupergiant and a B dwarf. In Cycle 2 we observed with theGHRS the last eclipse of the B dwarf by the K star's wind andchromosphere. Analysis of these spectra has led to asignificantly improved understanding of how the K star windflows from the binary system. A low density region forms infront of the binary system which periodically becomes an H IIregion as the B star moves in front of the K star, and thewind shows much lower turbulence velocities than previouslyinferred from IUE data. Unfortunately the HST data have alsoemphasised just how complex this process really is and thehigh degree of asymmetry involved. The wind outflow andorbital velocity are comparable and this leads to acceleratedand stagnant zones in the flow, which is itself modulated bythe varying separation of the two stars. The proposedobservations form part of our previously approved Cycle 5/6program to study Zeta Aur during the next eclipse centered onDecember 1 1995, and will provide new observations to helpanswer some of the questions raised as a result of ouranalysis and modelling. Our objectives are to (1) measure theturbulence, T_e, and N_e of the K star chromosphere duringeclipse, (2) determine the stability of the system from orbit-to-orbit, (3) investigate the symmetry of the K staratmosphere, (4) determine the ISM column density andreddening, and (5) measure the ionization fraction of doubly-ionized metals and the turbulence in the K star wind.
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