Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5467g&link_type=abstract
HST Proposal ID #5467
Physics
Hst Proposal Id #5467 Hot Stars Eruptive Binaries
Scientific paper
Ten years after its 1983 eruption as a classical nova, GQ Muscae is still a luminous "supersoft" x-ray source, and is also a high amplitude optical variable. This combination of features can be understood if the white dwarf is continuing to burn hydrogen on tis surface and is heating the secondary component of the nova giving rise to optical light variations. Although this model is attractive, GQ Mus then stands out as being only recent classical nova to achieve a decade-long active lifetime. Thus the behavior of GQ Mus has important consequences for our understanding of the life cycles of classical novae. We propose to use the unique HST UV capabilities to measure key physical spectroscopic properties of this remarkable star. With the FOS we will obtain vacuum ultraviolet (VUV) spectrum to measure the continuum shape of the photosphere and thereby test the hot star model. The VUV spectrum will also allow us to measure the properties and possible varia- bility of emission lines. For example, a stellar wind is expected if this star is still undergoing nuclear burning in its envelope. We will examine our data for short term time dependent effects to study the relationship between the UV line and continuum variations and the optical. The results from the HST observations will be combined with ROSAT x-ray, VUV photometry, and optical data to build an understanding of an important cataclysmic variable system.
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