An Observational Evidence of the Common Envelope Phase

Details An Observational Evidence of the Common Envelope Phase An Observational Evidence of the Common Envelope Phase

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rmxac..20...37s&link_type=abstract

Compact Binaries in the Galaxy and Beyond, Proceedings of the conference held 17-22 November, 2003 in La Paz, Baja California Su

Astronomy and Astrophysics

Astronomy

Stars: Abundances, Stars: Activity, Stars: Coronae, X-Rays: Stars

Scientific paper

Chandra Low Energy Transmission Grating Spectrograph observations of the pre-cataclysmic binary V471 Tau have been used to estimate the C/N abundance ratio of the K dwarf component for the first time. While the white dwarf component dominates the spectrum longward of 50 Å, at shorter wavelengths the observed X-ray emission is entirely due to coronal emission from the K dwarf. The H-like 2p 2P [3/2, 1/2] --> 1s 2S[1/2] resonance lines of C and N yield an estimate of their logarithmic abundance ratio relative to the Sun of [C/N] = - 0.38±0.15--half of the currently accepted solar value. We interpret this result as the first clear observational evidence for the presumed common envelope phase of this system, during which the surface of the K dwarf was contaminated by CN-cycle processed material dredged up into the red giant envelope.

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