Supersonic Chromospheric Winds CYC3-MED

Details Supersonic Chromospheric Winds CYC3-MED Supersonic Chromospheric Winds CYC3-MED

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4272d&link_type=abstract

HST Proposal ID #4272

Physics

Hst Proposal Id #4272

Scientific paper

We have discovered supersonic wind velocities in the chromosphere of the hybrid supergiant star: Alpha Aquarii (HD 209750; G2Ib). These mass motions in excess of the photospheric escape velocity are evident in the profile of the He I 10830A line, and confirmed by our model calculations. Such supersonic motion of a wind profoundly impacts the velocity profile and energy requirements of stellar winds and subsequent mass loss. We are proposing HST spectroscopic observations of Alpha Aqr in order to obtain line profiles and velocity shifts of transition region lines to identify the emitting region, to define the wind acceleration profile, and to settle long-standing controversies about the wind temperature.

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