Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541613h&link_type=abstract
American Astronomical Society, AAS Meeting #215, #416.13; Bulletin of the American Astronomical Society, Vol. 42, p.268
Other
Scientific paper
We present the continuing results of VLT ISAAC K-band spectroscopy of short period cataclysmic variable (CV) systems below the "period gap” between 2 to 3 hours. It is extremely difficult to see the secondary stars in short period systems, since the low luminosity secondaries are swamped by the accretion disks in these objects. We show the infrared spectra for 9 systems below the gap: V2051 Oph, V436 Cen, EX Hya, VW Hyi, Z Cha, WX Hyi, V893 Sco, RZ Leo, and TY PsA. We are able to clearly detect the secondary stars in all but WX Hyi, V893 Sco, and TY PsA. We present the first direct detections of the secondary stars of V2051 Oph and V436 Cen, and present new detections for EX Hya, VW Hyi, Z Cha, and RZ Leo. Previous infrared spectroscopic surveys of CVs above the period gap reveal that these secondaries suffer a universal deficit of C12, enhanced levels of C13, and unusual abundance patterns for other species (e.g., Mg,Si, Al, Ca). Infrared spectroscopy of short period magnetic CVs (polars) have shown that their secondary stars appear completely normal, and the secondaries in a sample of "pre-CVs" have normal carbon abundances. Implications for CV evolution and formation scenarios will be discussed.
Hamilton Ryan T.
Harrison Thomas E.
Howell Steve B.
Tappert Claus
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