Recurrent Nova IM Normae

Details Recurrent Nova IM Normae Recurrent Nova IM Normae

2002-04-20

arxiv.org/abs/astro-ph/0204354v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, submitted to Astronomy and Astrophysics Letters

Scientific paper

10.1051/0004-6361:20020985

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 R=17.0 mag and B=18.0 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, which may be also responsible for the low quiescent brightness, 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.

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