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, firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.