The Structure of Nova Shells

Details The Structure of Nova Shells The Structure of Nova Shells

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6336s&link_type=abstract

HST Proposal ID #6336

Physics

Hst Proposal Id #6336 Interstellar Medium

Scientific paper

Recent WFPC2 observations of the recurrent nova T Pyxidis showthat the ejected material from the previous eruptions isneither uniform nor isotropic. Rather, the ejecta isdistributed in hundreds of unresolved knots. If this result isthe norm for all nova ejecta then all previous mass estimatesand ejection models for nova shells are probably incorrect.Observationally determined masses of nova shells provide avery important test to the nova theory. We are proposing touse WFPC2 to determine if 1) all nova shells are in factbroken into knots, and, for the closest shells, 2) todetermine the size distribution of these knots. In additionWFPC2 observations of T Pyxidis will enable us to determinewhether the clumpy shell is expanding. Finally, we are askingfor a reendorsement (granted in cycles 1 and 4) to observe theeffects of the next eruption of T Pyx (once in a generationand now several years overdue) on its multitude of circumstellarknots.

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