Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99q.143p&link_type=abstract
Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.143
Astronomy and Astrophysics
Astronomy
Scientific paper
The use of Balmer-line profiles to determine atmospheric parameters of subdwarf B stars is a well-established method that relies on a comparison of spectroscopic observations with synthetic spectra generated from model atmospheres to determine atmospheric parameters, namely the effective temperature, surface gravity, and photospheric helium abundance. A similar analysis can be carried out using the profiles of the Lyman lines covered by current farultraviolet observations. We present observations for a sample of ten subdwarf B stars for which both optical and far-ultraviolet spectra were secured using the 2.3-m telescope at Steward Observatory and the FUSE satellite archives respectively. We then examine the important role played by the numerous lines of heavy elements in the FUSE range and provide a preliminary assessment of the impact of these lines on the atmospheric parameters derived from ultraviolet data.
Bergeron Pierre
Pereira Caroline
Wesemael François
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