Understanding Abundance Patterns of Cataclysmic Variables in the Near Infrared

Details Understanding Abundance Patterns of Cataclysmic Variables in the Near Infrared Understanding Abundance Patterns of Cataclysmic Variables in the Near Infrared

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21921103h&link_type=abstract

American Astronomical Society, AAS Meeting #219, #211.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the progress of an ongoing program to obtain and understand moderate resolution (R > 2000) near infrared (NIR) spectroscopy for all cataclysmic variable (CV) subtypes. Looking in the NIR allows us to directly examine the atmosphere of the donor star in the CV system. In general, pre-CV, magnetic, and short period systems appear to have normal abundances and do not harbor any surprises. A significant fraction of long period systems, however, show weak or absent K-band CO lines.
To fully assess these data, we compute synthetic spectra using either PHOENIX or MOOG. We use a genetic algorithm (GA) to search a multidimensional parameter space efficiently, spanning a large range in effective temperature, surface gravity, metallicity, C12/C13 isotope ratio, and a variety of individual elemental abundances. Of particular interest is the C abundance, which allows us to explore the C deficiencies as shown by weak or absent CO lines in our sample. The GA results have been calibrated against a number of "standard” K and M dwarfs with known abundances and stellar parameters to provide error and confidence estimates.
We present our early results of this observation and modeling program.

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