Probing the Extended Envelope of the Zeta AUR Type Binary 32 CYG

Details Probing the Extended Envelope of the Zeta AUR Type Binary 32 CYG Probing the Extended Envelope of the Zeta AUR Type Binary 32 CYG

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6522b&link_type=abstract

HST Proposal ID #6522

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #6522 Cool Stars

Scientific paper

32 Cyg belongs to the category of Zeta Aurigae binaries whichprovide the rare opportunity to examine the outer atmospheresof late type giants and supergiants. In such systems the dwarfcomponent serves as an astrophysical light-source which can beused to probe the chromosphere and wind of the evolvedprimary. 32 Cyg is the only system where a K supergiant can bestudied without complication due to an extended H II region.Our experience with Zeta Aur observed with the GHRS in Cycle 2demands an independent reference star to test and adjust themodel conception. We request time for GHRS observations ofline profiles of singly ionized metals at 5 orbital phases (3ingress, 1 total eclipse, and 1 egress observation). Therequired modelling codes, especially the 2-D/3-D radiativetransfer scheme has been developed and tested already for theZeta Aur analysis. The main objectives of this proposal are(1) to determine the density, wind velocity, andmicroturbulence as a function of the radial position, (2) todetermine the mass loss rate, (3) to study the fine structurepopulation of the lowest Fe II terms and the Fe II UV 9/UV 191pumping process, (4) to deduce the kinetic temperature andelectron density, (5) to study the symmetry of the K staratmosphere.

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