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C C D V I E W S #333 !! THIS IS A SPECIAL EDITION OF CCD VIEWS !! Table of Contents -------------------------------------------------------------------------- The cataclysmic variable CI Gem appears to be in outburst according to the following observations: APR 12.128 15.0 SPK CCD Unfiltered w/Red Zeropoint
APR 12.1056 <14.7 SXN
APR 11.119 <18.5 SPK CCD Unfiltered w/Red Zeropoint
SPK Patrick Schmeer Saarbruecken Germany SXN Mike Simonsen Imlay City, MI, USA If confirmed, this would be its first outburst since 1999. Time series observations are requested. Set exposures times for an SNR of 100. Time resolution is not as important as precision at this point. The system is faint so you can observe unfiltered if that is needed to get an SNR of 100. However, if you have access to a large aperture telescope then use a V filter. 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-0.15d. So there is lots to learn from consistent and careful time series observations of this system. Please observe CI Gem for as long as possible and report your observations to the AAVSO. An AAVSO web page for this campaign will be setup at this URL: http://www.aavso.org/news/cigem.shtml We will update the web page with light curves and other information. Please use the AAVSO-Photometry Discussion Group to coordinate this campaign. In addition, the AAVSO chat room will be open for this outburst. Below are links to the AAVSO charts with B and V photometry from Henden and a sequence from Sumner: http://www.aavso.org/cgi-bin/searchcharts3.pl?name=CI%20GEM Wenzel, IBVS 3440: http://www.konkoly.hu/cgi-bin/IBVS?3440 Kato & Schmeer, IBVS 4757: http://www.konkoly.hu/cgi-bin/IBVS?4757 Schmeer et at., IBVS 4758: http://www.konkoly.hu/cgi-bin/IBVS?4758 --------------------------------------------------------------------------- CCD Views is published when circumstances warrant via e-mail. An archive is available at http://www.aavso.org/publications/ccdviews/ . Please send comments and suggestions to aaronp@aavso.org. To receive CCD Views via e-mail send a message to majordomo@aavso.org with "subscribe ccdviews" in the body of the e-mail. To unsubscribe, place "unsubscribe ccdviews" in the e-mail. The AAVSO has many free online publications. To learn more and subscribe visit: http://www.aavso.org/publications/email/ Good observing! Aaron Price, AAVSO Technical Assistant (PAH) Gary Walker, Chairman of the AAVSO CCD Committee (WGR) Copyright 2005, American Association of Variable Star Observers
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