Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...399..219h&link_type=abstract
Astronomy and Astrophysics, v.399, p.219-222 (2003)
Astronomy and Astrophysics
Astrophysics
7
Stars: Cataclysmic Variables, Stars: Individual: Wz Sge, Accretion, Accretion Disks
Scientific paper
Time-resolved J and K band spectra were obtained for WZ Sge four days into its 2001 superoutburst. These data represent the first time-resolved IR spectra obtained of any dwarf nova during a superoutburst. The spectra show the usual broad emission lines due to H and He I plus strong He II (1.163 mu m), the latter line being essentially absent at minimum light. The J-band spectra contain complex line emission from C I, Fe I, Na I, and Ca I and show asymmetric H and He line emission from the accretion disc. The K-band continuum reveals an increasing slope to the red as seen during minimum light. Doppler maps produced from the IR spectra indicate the presence of asymmetric emission within the accretion flow, in agreement with the optical detection of prominent spiral arms present within the accretion disc.
Adamson Andy
Howell Steve B.
Steeghs Daniel
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