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2003MNRAS.338..401D - Mon. Not. R. Astron. Soc., 338, 401-411 (2003/January-2)
QU Car: a very high luminosity nova-like binary with a carbon-enriched companion.
DREW J.E., HARTLEY L.E., LONG K.S. and VAN DER WALT J.
Abstract (from CDS):
New intermediate dispersion optical spectroscopy of QU Car spanning 3800-7000 Å is presented. These data yield the discovery that Civλλ5801,12 is present as an unusually prominent emission line in an otherwise low-contrast line spectrum. Using measurements of this and other lines in a recombination line analysis, it is shown that the C/He abundance as proxied by the n(C4+)/n(He2+) ratio may be as high as 0.06 (an order of magnitude higher than the solar ratio). Furthermore, the C/O abundance ratio is estimated to be greater than 1. These findings suggest that the companion in QU Car is a carbon star. If so, it would be the first example of a carbon star in such a binary. An early-type R star best matches the required abundance pattern and could escape detection at optical wavelengths provided the distance to QU Car is ∼2 kpc or more.
Abstract Copyright: RAS
Journal keyword(s): stars: abundances - stars: carbon - stars: distances - stars: evolution - stars: individual: QU Car - novae, cataclysmic variables
Simbad objects: 6
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