Outburst of the symbiotic star CI Cygni

Details Outburst of the symbiotic star CI Cygni Outburst of the symbiotic star CI Cygni

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aan...382....1t&link_type=abstract

AAVSO Alert Notice 382

Physics

Symbiotic Variable, Ci Cygni, Eclipse, Aavso International Database

Scientific paper

Visual observations and instrumental photometry are urgently requested for the outbursting symbiotic variable star CI Cygni, beginning immediately (2008 August 31) and continuing for at least the next several weeks as the outburst evolves. The outburst was announced in AAVSO Special Notice #121. The last major outburst of CI Cyg occurred in March 1975. We note that CI Cyg should be in or near eclipse according to the ephemeris published by Fekel et al. (2000, AJ 119, 1375); their ephemeris predicts an eclipse date of 2454695.4 (assuming T0 = 2450426.4 and a period P = 853.8). Both visual observations and instrumental photometry of this event are strongly encouraged. Filtered time series observations are especially encouraged, particularly if the system goes into eclipse during the outburst. Calibrated, filtered photometry may provide constraints on the physical properties of the primary and secondary stars in this system if and when the outburst source is eclipsed. Observations should be submitted to the AAVSO International Database as CI CYG.

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