Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6627l&link_type=abstract
HST Proposal ID #6627
Other
Hst Proposal Id #6627 Hot Stars
Scientific paper
A relatively high residual continuum has been observed in themiddle of the H Lyman alpha line of Sirius A (Cycle 1 GHRSobservations) while classical models predict a null flux atline center. From very simplified calculations it appears thatthe scattering of photospheric Lyman alpha photons byexpanding neutral H associated with a wind would produce aline center continuum of the order of what is observed, whenthe mass loss and the terminal velocity of the wind aresimilar to those independantly deduced from the small blueshifted absorptions in the magnesium lines also observed withthe GHRS. We then suggest that, through appropriatesophisticated radiative transfer models,the H Lyman alphacontinuum and line shape of the A type stars can be used asvaluable tracers of the winds generated by these stars,otherwise very poorly detectable. This method , however, isrestricted to very bright objects for the line bottom to bewell detected. We propose to perform high signal-to-noiseratio GHRS observations of two other very bright A-type starsto search for similar characteristics at Lyman alpha, withalso a new observation of Sirius A with higher Signal to Noisewith the aim of disentangling stellar line asymetries frominterstellar absorptions.
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