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  CI Gem 2005 Campaign

Cataclysmic 
Variable
Artistic impression of a CV system. Credit: Mark A. Garlick
CI Gem is in outburst! CCD observations of CI Gem in V are needed during the current outburst. The length of the outburst is not known but could be very short. Not much is known of this system so high precision, time series CCD data could be very valuable!

Last updated: Wed Apr 20 12:53:23 EDT 2005

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More Info

Background

Previous outbursts have not been well covered so the exact nature of the system is unknown. Two types of outbursts have been identified in archival searches. Based on this, Wenzel (IBVS #3440) suggest it is a UGSU system but subsequence photometry by Kato (IBVS #4757) was not conclusive. Schmeer et al. (IBVS #4758) suggest it is a UGSS system with long and short outbursts based mainly on its relatively red color compared to typical UGSU systems.

From Schmeer et al.: "The 1940 eruption was a bright outburst, which lasted more than 18 days. The 1986 outburst listed by Wenzel was also bright, but of unknown duration, while the 1999 outburst was definitively fainter and shorter (5...7 days). The 1963 and 1966 outbursts were also faint, but too fragmentarily observed to permit any conclusions on their character."

Outbursts tend to be short, lasting only a few days. But past outburst coverage is incomplete so anything can happen. Stay sharp!

The orbital period of the system is not known and Kato reported periods from 0.05d-0.015d. So there is lots to learn from consistent and careful time series observations of this system.

Please use a V filter if possible and set exposures times for an SNR of 100. Time resolution is not as important as precision at this point. However, the system is faint so you can observe unfiltered if that is needed to get an SNR of 100.

 
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