Multi-Color Photometry of the 2001 Superoutburst of WZ Sagittae

Details Multi-Color Photometry of the 2001 Superoutburst of WZ Sagittae Multi-Color Photometry of the 2001 Superoutburst of WZ Sagittae

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20314804d&link_type=abstract

American Astronomical Society Meeting 203, #148.04; Bulletin of the American Astronomical Society, Vol. 36, p.593

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of multi-color photometric observations obtained during the 2001 superoutburst of WZ Sagittae. Our ten nights of observation span superoutburst days 4 to 85 and show various modulations including some periodic ones. Using nearly simultaneous color observations, we explore the physical state of the accretion disk. In particular, we provide color temperature estimates for the accretion disk at the start of, and at the peak of the first rebrightening. These observations reveal that the inner disk is optically thin and hot, the far outer disk remains neutral and does not participate in the rebrightening, and the remaining disk changes state from neutral to fully ionized during the rebrightening. We explore the implications of such behavior in terms of previous superoutburst disk models and develop a new model for the cause of the rebrightenings based on a hydrogen thermal limit cycle operating within the accretion disk.

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