HST/FOS spectral mapping of ip pegasi at the end of an outburst

Details HST/FOS spectral mapping of ip pegasi at the end of an outburst HST/FOS spectral mapping of ip pegasi at the end of an outburst

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..131s&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 131-132

Astronomy and Astrophysics

Astronomy

Scientific paper

Recently Baptista, Haswell & Thomas reported an optical eclipse mapping experiment showing that the spiral structures were still present in the accretion disc of the dwarf nova IP Pegasi some 8 days after the onset of the May 1993 outburst. Here we report time-resolved eclipse mapping of IP Pegasi on the following nights of the same outburst. HST/FOS fast spectroscopy covering 3 eclipses is analyzed to produce velocity-resolved eclipse maps across the C IV l1550 and He II l1640 emission lines as well as in the ultraviolet continuum in the range l = 1100-2500 Å. The maps reveal the final, complex evolution of the structures in the accretion disc as IP Peg approaches and goes back to quiescence, as well as the corresponding changes in the disc spectra and in the spectrum of the uneclipsed light. The results are compared with those of Baptista, Haswell & Thomas and are discussed in the framework of the current models to explain dwarf nova outbursts.

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