Lyman Line Spectroscopy of Hot Hydrogen-Rich White Dwarfs Revisited

Details Lyman Line Spectroscopy of Hot Hydrogen-Rich White Dwarfs Revisited Lyman Line Spectroscopy of Hot Hydrogen-Rich White Dwarfs Revisited

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..334..185v&link_type=abstract

14th European Workshop on White Dwarfs, ASP Conference Series, Vol. 334 Proceedings of a meeting held at Kiel, July 19-23, 2004

Astronomy and Astrophysics

Astronomy

6

Scientific paper

We present a study of 40 hot DA white dwarfs observed with the Far Ultraviolet Spectroscopic Explorer (FUSE). We measured the effective temperatures and surface gravities using a grid of pure-hydrogen model atmospheres in local thermodynamic equilibrium (LTE). Systematic differences with similar measurements based on Balmer line spectroscopy are in part due to non-LTE departure in the hydrogen atom, but for the most part they are due to the presence of heavy-elements in many white dwarf atmospheres throughout the range of effective temperatures covered in our sample.

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