Probing the Chromospheric Structure of Alpha Tau

Details Probing the Chromospheric Structure of Alpha Tau Probing the Chromospheric Structure of Alpha Tau

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6722c&link_type=abstract

HST Proposal ID #6722

Physics

Hst Proposal Id #6722 Cool Stars

Scientific paper

Fluorescent H_2 lines {excited by Hydrogen LyAlpha} and Ca II lines formed by recombination after photoionization by H LyAlpha were recently seen in GHRS spectra of the K5 III star Alpha Tau. This is the first time these lines have been seen in a giant star. The presence of these lines provides an opportunity to probe the structure of the upper chromosphere {Ca II} and of the low chromosphere/temperature minimum region {H_2} in this star and to test existing and new theoretical models of the outer atmosphere of Alpha Tau. In addition, the H_2 lines allow us to probe cooler regions than possible using the standard atomic emission line diagnostics and thus enable us to test the hypothesis of Wiedemann et al. {1994 ApJ 423, 806} that the atmosphere of cool giants are thermally bifurcated in the region above the photosphere. We propose to obtain, during Cycle 6, observations of the full set of Ca II and H_2 lines needed to perform these analysis and tests and to use these data to create new models of the chromosphere of Alpha Tau.

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