Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6010b&link_type=abstract
HST Proposal ID #6010
Other
Hst Proposal Id #6010 Cool Stars
Scientific paper
The H I Lyman-Alpha line is probably the most important cooling channel for transition regions in late-type stars, and it directly or indirectly influences the formation of numerous other UV lines, yet it is the least studied line in the far UV. Accurate intrinsic stellar line profiles would be of immense use both as a diagnostic of stellar transition regions and for studies of the local interstellar medium (LISM), including determining the D/H ratio. An additional use is to determine the intrinsic stellar Ly-Alpha flux from low-dispersion observations. However, the absorption of most of the stellar flux by interstellar material and the high geocoronal background in IUE has seriously complicated the analysis of this line. It is possible to circumvent, to a large extent, the influence of the LISM on the intrinsic stellar profile by observing stars with radial velocities high enough to Doppler shift a significant fraction of the emission line out of the LISM absorption core. Motivated by the success of our previous IUE and HST programs that focussed on giant stars, we have selected 7 dwarf stars covering a range of spectral types, with radial velocities from 150 to over 300 km/sec for detailed studies of their Ly-Alpha profiles.
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