Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1165c&link_type=abstract
The Astronomical Journal, v. 114, p. 1165.
Astronomy and Astrophysics
Astronomy
17
Scientific paper
We have re-examined two archival HST FOS G130H spectra of the prototype dwarf nova U Geminorum obtained during its quiescence 13 days and 70 days after a wide outburst. Using synthetic spectral fitting with two flux-emitting components, a slowly rotating white dwarf photosphere, and a rapidly spinning accretion belt (Vrot sin i=3200 km s-1) significantly improves the spectral fit but does not provide a unique solution. We found clear evidence for the cooling of the white dwarf, confirming earlier results, and evidence for the cooling of the accretion belt or gas in Keplerian motion as well. If an accretion belt is really present, then for the white dwarf and belt, respectively, 13 days post-outburst, we find Twd=37 000±400 K and Tbelt=45 000 ±2500 K while at 70 days post outburst, we find Twd=33 500 ±700 K and Tbelt=37 500 ±4000 K. These results are compared with our HST GHRS G160M observations obtained 13 days and 61 days after a narrow outburst of U Gem.
Cheng Fu-Hua
Horne Keith
Huang Minyi
Hubeny Ivan
Sion Edward M.
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