NOAO >   Observing Info >   Approved Programs >   2004B-0272

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Proposal Information for 2004B-0272


PI: Michael Shara, American Museum of Natural History, mshara@amnh.org
Address: Astrophysics, CPW at 79th Street, New York, NY 10024, USA

CoI: David Zurek, American Museum of Natural History
CoI: Chris Martin, Caltech
CoI: Mark Seibert, Caltech

Title: Dwarf Nova Shells and Ejecta.....An Unexpected Discovery

Abstract: GALEX UV imagery has discovered a 40 arcmin diameter shell surrounding the Dwarf Nova (DN) Z Cam. The conventional theory (the "disk instability model"=DIM) of DN does not predict (or explain) DN shells. The shell may be the remnant of a classical nova explosion several hundred years ago...finally "proving" that DN and classical novae are the same systems (Shara et al 1986 ApJ 311, 163). Alternately, many or most DN may have similar shells...demonstrating that DIM is wrong and that thermonuclear runaways power DN as well as classical novae. The proposed narrowband imaging survey of about 40 DN of various subtypes will cleanly differentiate between these two possibilities.


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NOAO >   Observing Info >   Approved Programs >   2004B-0272

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