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Peculiar Abundances in CV Secondary Stars: Revising their Evolutionary History?

Published online by Cambridge University Press:  22 February 2018

Thomas E. Harrison
Affiliation:
New Mexico State University, Box 30001/MSC4500, Las Cruces, NM 88003USA
Steve B. Howell
Affiliation:
WIYN Observatory and National Optical Astronomy Observatories, (50 North Cherry Avenue, Tucson, AZ 85726USA
Joni J. Johnson
Affiliation:
New Mexico State University, Box 30001/MSC4500, Las Cruces, NM 88003USA
Heather L. Osborne
Affiliation:
New Mexico State University, Box 30001/MSC4500, Las Cruces, NM 88003USA
Derek Homeier
Affiliation:
Dept. of Physics and Astronomy, University of Georgia, Athens, GA 306027USA

Extract

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We have recently completed an infrared (K-band) spectroscopic survey of two dozen cataclysmic variables. The systems range in orbital period from Рorb = 1-35 hr (EF Eri), to Рorb = 11.0 hr (V442 Cen). We detect the secondary star in every system.

Nearly all of the CVs in which we can clearly see the secondary have weak CO features. Most show evidence for enhanced levels of 13CO. In addition, we see apparent enhancements and/or deficits of such species as sodium, calcium, titanium, magnesium, silicon, and iron. In addition, we find a few lines that we have been unable to identify (such as the strong feature we call “cataclysmicum” at 2.2767 μm seen in the spectrum of EF Eri, and two other very short period CVs).

Type
The Contributed Papers
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

References

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