Statistics – Computation
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9179j&link_type=abstract
HST Proposal ID #9179
Statistics
Computation
Hst Proposal Id #9179 Hot Stars
Scientific paper
We have discovered quasi-molecular absorption features of Lyman Alpha {at 1400 and 1600 Angstrom} in UV spectra of magnetic white dwarfs taken with IUE; hitherto such features have only been known in non-magnetic objects where they offered a very accurate determination of the atmospheric parameters. With high quality HST/STIS UV spectra of five white dwarfs we will for the first time be able to study the molecular potential of H_2 and H_2^+ under the influence of a magnetic field and to compare the results to theoretical calculations. Besides the relevance for atomic and molecular physics, the HST observations will be a tool to precisely determine effective temperatures and gravities {and thereby age and mass}. Even more important is the possibility to test the efficiency of convection under the influence of a strong magnetic field and to find out how strongly the degree of ionization equilibrium is modified by the magnetic field. Convection is a completely free parameter in the computation of the model atmospheres and the analyses of all magnetic white dwarfs with effective temperatures between 10000 K and about 17000 K suffer from this uncertainty. Finally, one of our target stars is within an close binary {AM Her-type}, and provides us with the possibility to test how the quasi- molecular features change due to the enrichment of the hydrogen atmosphere with heavy elements from the secondary star.
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