Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8671s&link_type=abstract
HST Proposal ID #8671
Computer Science
Hst Proposal Id #8671 Ism And Circumstellar Matter
Scientific paper
We propose target-of-opportunity observations of a classical nova in the Magellanic Clouds in the early stages of its outburst. Nova outbursts are thermonuclear runaways triggered by accretion onto a white dwarf within a close binary system. As such, nova systems are a possible evolutionary stage on the way to a final accretion-induced collapse and a Type Ia supernova explosion. The study of how the accreted mass is mixed, the nuclear processing that occurs during the outburst, the energetics of the explosion, and the determination of ejecta masses constrain models for SNe Ia progenitors. The ultraviolet {UV} spectrum provides fundamental and unique information on the expanding nova ejecta. We propose to obtain spectrophotometric and line-profile information at sufficient resolution with STIS to determine the abundances and mass of the ejecta as a function of position in the nebula and, thereby, obtain a comprehensive picture of the energetics of the outburst, which can be compared to multidimensional hydrodynamic studies of nova explosions. Because novae are hot and have lines from chemical elements that are only detectable in the UV, the STIS UV capability is crucial for an analysis of nova ejecta. The nova will also provide a background source for study of the Galactic and MC interstellar media along the line of sight to the outburst.
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