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Title:
Z Camelopardalis - The Return of Dark Matter
Authors:
Howell, Steve B.; Hoard, D. W.; NOAO-Spitzer Z Cha Team
Affiliation:
AA(NOAO), AB(SSC), AC()
Publication:
American Astronomical Society, AAS Meeting #213, #491.13; Bulletin of the American Astronomical Society, Vol. 41, p.469
Publication Date:
01/2009
Origin:
AAS
Bibliographic Code:
2009AAS...21349113H

Abstract

The deeply eclipsing cataclysmic variable Z Camelopardalis was observed by the Spitzer Space Telescope Imaging Array Camera (IRAC). We obtained simultaneous 4.5 and 8 micron images covering one full orbit at 4 second time resolution. Contemporaneous ground-based B-band photometry and long term photometric monitoring reveal that Z Cha was in a normal low state during all of our observations. The mid-IR light curves show the presence of primary eclipse, being much shallower in the 8 micron data-set, with only a weak indication of the pre-eclipse hot spot. Primary eclipse is much broader in the mid-IR light curves than in the optical and the presence of a secondary eclipse is observed as well. As with our previous Spitzer Space telescope result for the eclipsing CV WZ Sge, the Mid-IR observations of Z Cha suggest the presence of a dark matter dust ring surrounding the gaseous accretion disk. We will present our observations, a model for the dust in the Z Cha binary, and compare and contrast this new result with that for WZ Sge. This research was funded in part by the NSF and NASA through the National Optical Astronomy Observatory and the Spitzer Science Center.
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