The Structure of Nova Shells

Physics

Scientific paper

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Hst Proposal Id #6060 Interstellar Medium

Scientific paper

Recent WFPC2 observations of the recurrent nova T Pyxidis show that the ejected material from the previous eruptions is neither uniform nor isotropic. Rather, the ejecta is distributed in hundreds of unresolved knots. If this result is the norm for all nova ejecta then all previous mass estimates and ejection models for nova shells are probably incorrect. Observationally determined masses of nova shells provide a very important test to the nova theory. We are proposing to use WFPC2 to determine if 1) all nova shells are in fact broken into knots, and, for the closest shells, 2) to determine the size distribution of these knots. In addition WFPC2 observations of T Pyxidis will enable us to determine whether the clumpy shell is expanding. Finally, we are asking for a reendorsement (granted in cycles 1 and 4) to observe the effects of the next eruption of T Pyx (once in a generation and now several years overdue) on its multitude of circumstellar knots.

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