Spiral Structure in WZ Sagittae around the 2001 Outburst Maximum

Details Spiral Structure in WZ Sagittae around the 2001 Outburst Maximum Spiral Structure in WZ Sagittae around the 2001 Outburst Maximum

2001-12-16

arxiv.org/abs/astro-ph/0112374v1

Astronomy and Astrophysics

Astrophysics

5 pages, 8 figures, accepted for publication in PASJ

Scientific paper

Intermediate resolution phase-resolved spectra of WZ Sge were obtained on five consecutive nights (July 23 -- 27) covering the initial stage of the 2001 superoutburst. Double-peaked emission lines of He\textsc{II} at 4686 \AA, which were absent on July 23, emerged on July 24 together with emission lines of C\textsc{III} / N\textsc{III} Bowen blend. Analyses of the He\textsc{II} emission lines using the Doppler tomography revealed an asymmetric spiral structure on the accretion disk. This finding demonstrates that spiral shocks with a very short orbital period can arise during the initial stage of an outburst and may be present in all SU UMa stars.

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