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Detailed optical behavior of the 2000 outburst of the eclipsing recurrent nova CI Aquilae
The 2000 outburst of the recurrent nova CI Aql was followed by opticalphotometry and spectroscopy. Our time-resolved photometry revealed itsintraday variations during the outburst. The orbital modulation of thelight curve appeared after entering the plateau stage. We found thatprimary eclipses were ~ 0.6 mag in depth, but the profile of the eclipsewas significantly different from that in the quiescent phase. The foldedorbital light curve was represented by a wide wing of a primary eclipseand it suggests the existence of the accretion disk at the plateaustage. In this outburst, we obtained accurate determination of severalminima of primary eclipses, and found that the timings of minima showeda substantial delay compared to the previously reported ephemeris.However, no significant evidence of a change in the orbital period wasobserved since the discovery of the eclipsing nature of this object. Weexamined the evolution of optical spectra through the outburst, whichreconfirmed the nova nature of this object. A spectrum taken on 2000October 10 showed the Hα in emission and indicated that the objecthad not yet reached quiescence. The overall light curve and late-stagespectroscopy have revealed that the plateau is the longest one amongrecurrent novae.
| CI Aquilae
IAUC 7444 available at Central Bureau for Astronomical Telegrams.
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