Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.1195c&link_type=abstract
HST Proposal ID #1195
Physics
Hst Proposal Id #1195
Scientific paper
The goals of this program are to determine the physical characteristics of the winds/chromospheres around cool luminous stars. GHRS observations of the C II (UV 1) 1335 A and (UV 0.01) 2325 A multiplets will be used along with observations of the C I lines near 1655 and 1994 A to constrain the temperatures and densities in model chromospheres. The C II (UV 0.01) lines will also be used to estimate the turbulence in these chromospheres. The (confusing) far UV spectrum of the M supergiants will be explored with the GHRS. GHRS echelle observations of a set of Fe II lines in the 2700 - 2800 A region will be used to study the dependence of the wind velocity on radial distance above the photosphere. High quality Mg II profiles will be acquired to search for discrete velocity features and the presence of circumstellar absorption within the profiles. The photospheric absorption-line spectrum (2579-2675 A) of Arcturus will be observed in the echelle mode. Medium resolution observations of Fe II and Mg II in the dusty, very luminous star Mu Cep will provide information on the effect of dust and very low gravity on the wind velocity field.
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