The Atmosphere and Wind of a Nearby K Supergiant : CYCLE4 Medium

Details The Atmosphere and Wind of a Nearby K Supergiant : CYCLE4 Medium The Atmosphere and Wind of a Nearby K Supergiant : CYCLE4 Medium

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5307r&link_type=abstract

HST Proposal ID #5307

Physics

Hst Proposal Id #5307 Cool Stars Stellar Atmospheres

Scientific paper

We propose observations of the non-coronal K5 II star lambda Vel using the Goddard High-Resolution Spectrograph (GHRS). This proposal addresses the unsolved problems of non-radiative heating and wind acceleration in cool star atmospheres. We propose to obtain spectra of (a) optically thin emission lines sensitive both to electron density and to mass motions, (b) Fe II lines strategically selected to sample wide ranges of optical depth and excitation temperature within the chromosphere and wind, (c) the chromospheric "continuum" and CO absorption systems which will help to constrain physical conditions in cooler atmospheric components and (d) the Mg II and O I resonance lines to study the wind and interstellar absorption profiles. The best available IUE data, in conjunction with radiative transfer calculations, have provided clues to the atmospheric characteristics. The GHRS is needed to obtain the high quality data necessary for us to construct a realistic, semi-empirical, spherically symmetric model atmosphere. A major aim is to compare the atmospheric and wind structure derived for lambda Vel with that determined from HST eclipse spectra of the zeta Aur binary system, whose primary has very similar physical parameters to lambda Vel. Until now, the binary systems have provided the only reliable method of determining wind acceleration pro*

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