Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0402v&link_type=abstract
American Astronomical Society Meeting 210, #04.02; Bulletin of the American Astronomical Society, Vol. 39, p.99
Other
3
Scientific paper
V4743 Sgr was a bright, classical nova that was first detected on Sept. 20, 2002 at a visual magnitude of 5. Its early light curve had a rapid decay, declining by 2 magnitudes in only 9 days. Optical photometry obtained in July 2005 revealed two periods; the orbital period at 6.7 hours and the spin period at 1400 seconds (Wagner et al. 2003). The spin period was also detected in extensive Chandra and XMM-Newton X-ray observations from 2003 (Ness et al. 2003; Leibowitz et al. 2006), although it is at a slightly different than that seen in the optical. Optical photometry has established the progenitor to be an intermediate polar (Kang et al. 2006). We obtained ultraviolet spectra of this interesting object with the GALEX satellite on July 31, 2006 and optical spectra on Sept. 28, 2006. The spectra show a nova in the decaying nebular stage with emission lines of carbon, nitrogen and oxygen. The Balmer lines are notably absent in the spectra. This is consistent with the end of nuclear burning on white dwarf approximately one year after discovery. The interstellar absorption feature in the UV can be corrected with an E(B-V) 0.25, which is in agreement with many of the other reddening estimates in the literature. Using this reddening and the maximum-magnitude vs rate of decline relationship for novae we derived a distance of 3.9+/-0.3 kpc. We will present a detailed analysis of the observations in this poster based on observations made with the NASA Galaxy Evolution Explorer. GALEX is operated for NASA by the California Institute of Technology under NASA contract NAS5-98034.
Helton Andrew
Ness J.
Schwarz Gerhard
Starrfield Summer
Vanlandingham Karen M.
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