Volume 391, Number 2, August IV 2002
|Page(s)||L7 - L9|
|Published online||02 August 2002|
Letter to the Editor
Recurrent nova IM Normae
Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan
2 Faculty of Science, Kyushu University, Fukuoka 810-8560, Japan
3 Center for Nova Studies, Casilla 5022 Renaca, Viña del Mar, Chile
4 Bronberg Observatory, PO Box 11426, Tiegerpoort 0056, South Africa
Corresponding author: T. Kato, email@example.com
Accepted: 2 July 2002
We detected the second historical outburst of the 1920 nova IM Nor. Accurate astrometry of the outbursting object revealed the true quiescent counterpart having a magnitude of mag and mag. We show that the quiescent counterpart shows a noticeable variation. From the comparison of light curves and spectroscopic signatures, we propose that IM Nor and CI Aql comprise a new class of recurrent novae bearing some characteristics similar to those of classical novae. We interpret that the noticeable quiescent variation can be a result of either high orbital inclination, or the presence of high/low states. If the second possibility is confirmed by future observations, IM Nor becomes the first recurrent nova showing state changes in quiescence. Such state changes may provide a missing link between recurrent novae and supersoft X-ray sources.
Key words: novae, cataclysmic variables / stars: individual: IM Nor
© ESO, 2002
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