Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713001u&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #130.01; Bulletin of the American Astronomical Society, Vol. 33, p.714
Other
Scientific paper
We present the results of a synthetic spectral analysis of the IUE archival spectra of the dwarf nova RU Peg. This peculiar system lies above the period gap (Porb = 0.3746 d), is classified as a U Gem sub-type, has an outburst amplitude of four magnitudes, and an outburst recurrence time of 75-85 days. Its component masses are known (Mwd = 1.21 Msun, Msec = 0.94 Msun), and its orbital inclination is 33+/-5 deg (Ritter & Kolb, 1998). We have carried out high gravity model atmosphere fits to the lowest flux-level spectra taken during dwarf nova quiescence, as well as model accretion disk fits. Our analysis reveals the presence of an underlying white dwarf accretor that appears to be hotter than 30,000 K. Our physical interpretation of the spectra involves a composite spectral energy distribution consisting of a hot accreting white dwarf and an accretion disk. Our results are compared with the white dwarf temperature, accretion rate, and chemical abundances of other U Gem-type systems above the period gap. This research is supported by NSF grant 99-09155 to Villanova University. Support was also provided by the NASA-Delaware Space Grant Colleges Consortium.
Dulude Michael J.
Sion Edward M.
Urban Joel A.
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