Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3605l&link_type=abstract
HST Proposal ID #3605
Computer Science
Hst Proposal Id #3605
Scientific paper
We propose to obtain spectroscopy of 7 Ofpe/WNL stars in the LMC with the FOS + gratings G130H,G190H. Ofpe/WNL stars are hot luminous objects with spectral characteristics intermediate between WR and Of stars. Their wind densities make them ideal test cases to study BOTH wind AND photospheric properties: the mass loss is significantly higher than in normal O stars so that different wind regions can be sampled by numerous lines, yet it is not so high as to completely veil the photosphere, as occurs in W-R stars. We will take advantage of this unique opportunity and perform a detailed non-LTE analysis using the most sophisticated model atmospheres in existence. A complete set of stellar parameters, including the mass- loss rate and velocity field, will be derived empirically. The results will be compared to the predictions of the theory of radiatively driven winds. We will assess the question if radiation pressure can IN PRINCIPLE drive mass loss in this part of the HRD, and we will investigate if the current hot star wind theory makes QUANTITATIVELY correct predictions for Ofpe/WNL and related O stars. A second goal of this proposal is to evaluate the evolutionary status of Ofpe/WNL stars. Based on the stellar parameters --- including abundances --- found in our analysis, we will test the suggestion that these objects are the evolutionary link between O and W-R stars.
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