Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6071c&link_type=abstract
HST Proposal ID #6071
Physics
Hst Proposal Id #6071 Hot Stars
Scientific paper
The Herbig Ae/Be stars are pre-main sequence objects of intermediate mass, and, according to standard stellar evolution theory, they are not supposed to possess outer convection zones. Despite this absence of convection, they show evidence for intense activity, which may be magnetic in origin. The model proposed so far to explain the various line profiles observed in these stars includes an extended chromosphere with temperatures of the order of 15,000--20, 000 K. A few Herbig Ae/Be stars were recently detected as X-ray sources by ROSAT, but no evidence for temperatures typical of solar-type transition regions has ever been found in these stars. This lack of evidence may be the result of the low sensitivity of the instruments used so far. Using the GHRS, we propose to make a deep search for N V resonance lines near 1240 Angstrom in the spectrum of AB Aur, the star which is the prototype of this class. A non-detection would confirm the moderate temperature chromosphere model, while a positive detection would indicate the presence of temperatures above 100,000 K and would thus impose strong constraints on the mechanisms of nonradiative energy deposition in the atmospheres of these stars.
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