Comparison of Optical and UV Spectra to Detect Double Degenerates

Details Comparison of Optical and UV Spectra to Detect Double Degenerates Comparison of Optical and UV Spectra to Detect Double Degenerates

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99q.139l&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.139

Astronomy and Astrophysics

Astronomy

Scientific paper

The search for unresolved white dwarfs in binary systems is presently an intense field of research because they represent the most likely progenitors of Type Ia supernovae. However, the number of such double degenerate systems detected so far is small compared to the number expected from binary evolutionary models, and cannot account for the observed rate of Type Ia supernovae. A different approach for detecting these unresolved binary systems is to look for discrepancies between effective temperatures obtained from fits to the hydrogen Balmer lines and those derived from the ultraviolet energy distributions. We report on the results of more than 150 hydrogen-line white dwarfs selected from IUE archives. Even though known double degenerates clearly stand out in our analysis, most of the observed discrepancies can be explained by the presence of interstellar reddening or by the presence of heavy elements in the atmosphere of the hottest stars in our sample.

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