a Search for Silicon and Carbon in GP COM

Details a Search for Silicon and Carbon in GP COM a Search for Silicon and Carbon in GP COM

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3824w&link_type=abstract

HST Proposal ID #3824

Other

Hst Proposal Id #3824

Scientific paper

The spectra of the 46 minute period binary white dwarf GP Com show emission lines from an accretion disk supplied from the hydrogen-exhausted core of a star, providing us with an opportunity to see the products of nucleosynthesis directly. The optical and ultraviolet data taken to date show evidence for CNO processing, but the abundances of elements such as silicon, calcium and iron appear anomalously low. The only plausible explanation for this involves the transfer of nitrogen-rich material from the progenitor of the accreting white dwarf to its companion in a common envelope stage. Confirmation of the low abundance of the heavier elements is a critical test of this model. We will take high signal-to-noise ultraviolet spectra of GP Com to search for emission from the SiIV 1400 doublet, CIV 1550 and other Si and C ions. We will measure the emission from NV 1239, 1243. This will allow us to determine the extent of CNO equilibrium and enhancement of nitrogen. These data will constrain both the evolution of GP Com and the poorly understood common envelope phase of binary evolution.

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