Eclipse Mapping of the Chromopsheric and Transition Region Structure of the Hybrid Chromosphere Star HR2554 (G6 Ii)

Details Eclipse Mapping of the Chromopsheric and Transition Region Structure of the Hybrid Chromosphere Star HR2554 (G6 Ii) Eclipse Mapping of the Chromopsheric and Transition Region Structure of the Hybrid Chromosphere Star HR2554 (G6 Ii)

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5398b&link_type=abstract

HST Proposal ID #5398

Physics

Hst Proposal Id #5398 Cool Stars Atmospheres &Amp, Winds

Scientific paper

We propose to observe an eclipse of the Zeta Aurigae-type binary HR2554 using the GHRS. Every 195 days the A1 dwarf secondary passes behind the outer atmosphere of the G6 II primary and can be used as light source to observe absorption lines from plasma in the G star atmopshere. The G star has a hybrid-chromosphere structure with hot transition region plasma and a cool stellar wind. THESE OBSERVATIONS WOULD BE THE FIRST ECLIPSE OBSRRVATIONS OF THIS TYPE OF ATMOSPHERE WITH GHRS AND COMPARED WITH OUR RESULTS FOR THE K4 SUPERGIANT Zeta Aur, which shows only the typical red supergiant wind. We shall model the observed line profiles and determine the temperature structure, density stratification, wind acceleration/turbulence/ionization as a function of distance above the G star photosphere. The hot and cool plasma are intermixed in this outer atmosphere and we will quantify this "thermal bifurcation". Both the static and outflowing components of the atmopshere will be modelled. The mass loss rate and the wind velocity and density laws as a function of radius will be determined. The vast majority of the needed modelling code will have been developed already for our Zeta Aur analysis. This project represents an opportunity to significantly advance knowledge about the spatial structuring of cool star outer atmospheres and the physical process operating within them.

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