Observations of SS Cyg Quiescence to Outburst

Details Observations of SS Cyg Quiescence to Outburst Observations of SS Cyg Quiescence to Outburst

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0901w&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #09.01; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We collected data at both the SARA 0.9 meter telescope at Kitt Peak National Observatory and at the Ball State University Observatory to investigate the behavior of the Cataclysmic Variable Binary System SS Cygni. The majority of our data covers the system’s quiescent state, while the last two nights show the rise to outburst and the outburst. We investigated changes in the temperature and radius of the accretion disk over time.
The period search found a periodicity of 2.5 hours when SS Cyg began its rise to outburst. This could be due to changes in the disk related to the onset of the outburst.
The color-color diagrams show the disk to be a good approximation to a blackbody at longer wavelengths. Surprisingly, this appears to be true even in quiescence. In the first hours of the outburst the color-temperature of the disk rose about 270 K while the disk radius increased by 30%. Twenty four hours later the disk was about 15,000 K hotter, 2 magnitudes brighter but 10% smaller than its size in quiescence. This behavior is different from U Gem where the disk size increases at outburst and slowly declines until quiescent brightness is reached (Warner 1995) and is not predicted by current models.
Further multi-color observations of outburst are needed to determine if the June 25, 2006 outburst of SS Cyg was unique in this manner.
This project was funded by a partnership between the National Science Foundation (NSF AST-0552798), Research Experiences for Undergraduates (REU), and the Department of Defense (DoD) ASSURE (Awards to Stimulate and Support Undergraduate Research Experiences) programs.

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