Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4487b&link_type=abstract
HST Proposal ID #4487
Physics
Hst Proposal Id #4487
Scientific paper
Herbig Ae stars are intermediate mass pre-main sequence (PMS) stars, and the more massive counterparts of the well-known T Tauri stars. Their evolution and atmospheric properties are still poorly understood. We propose to study the profiles of emission lines formed in the outer atmosphere/ circumstellar regions of the brightest and closest Herbig Ae star, HD104237, using GHRS spectra at moderate and high resolution of selected high temperature emission lines. At present it is not clear if these lines form in a classical transition region (TR)/chromosphere, a stellar wind, or an accretion disk (probably the least likely alternative) The emission line profiles will be analyzed to investigate atmospheric (density and temperature structure) and wind (mass loss rate, velocity and density laws) properties of this star. One goal is to discover if the winds from Herbig Ae stars can totally dominate the atmospheric structure of the star with TR plasma forming an integral part of the stellar wind or if physically separate, stationary, confined regions exist at the base of the wind. We shall determine quantitative constraints on the non-radiative heating and mass loss processes in the atmosphere, which will allow a better understanding of the evolution of PMS stars, since the heating and mass loss are driven by processes related to the sub-photospheric stellar structure.
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