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[vsolj-alert 716] Nova Aql 2000 = CI Aql, the discovery of a new recurrent nova



From owner-vsnet-alert@kusastro.kyoto-u.ac.jp Sun Apr 30 05:51 JST 2000
Date: Sun, 30 Apr 2000 05:37:29 +0900 (JST)
From: Taichi Kato <tkato>
To: vsnet-alert
Cc: dgreen@cfa.harvard.edu
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Subject: [vsnet-alert 4714] Nova Aql 2000 = CI Aql?
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   In response to [vsnet-alert 4712], it has become increasingly established
that Nova Aql 2000 (present nova) is a recurrence of CI Aql in 1917.
The quiescent identification with a 0.6-day eclipsing binary with HeII
and CIII/NIII emission lines would then be interpreted as a system closely
related to supersoft X-ray source (SSXS) which repeatedly undergo
nova explosions.  The eclipse light curve and the orbital period strongly
resembles those of known SSXS and V Sge stars.  The presence of high
excitation emission lines are common among them, and CV-type recurrent
novae like U Sco.  The present opportunity in observing the eclipsing
recurrent nova in outburst should not be overweighted.  Time-resolved
photometry and spectroscopy, observations at other wavelengths (esp.
soft X-rays) are uegently encouaraged.  The VSNET collaboration team
will continue focusing on this object, and we heartily appreciated
efforts from world-wide observers to cover the full orbital period.

Regards,
Taichi Kato
Makoto Uemura
and the VSNET collaboration team


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