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IAUC 7818: IM Nor; 2002an

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                                                  Circular No. 7818
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


IM NORMAE
     A. Retter and S. J. O'Toole, University of Sydney; and S.
Starrfield, Arizona State University, report:  "Medium-resolution
optical spectra (400-700 nm) were obtained of IM Nor on Jan. 26.75
UT using the Anglo-Australian Telescope (+ RGO spectrograph).  Our
spectra quantitatively resemble those reported by Duerbeck et al.
(IAUC 7799).  The strong hydrogen Balmer lines (H-alpha to H-delta)
all show P-Cyg profiles, and we still see strong Fe II emission,
confirming that this recurrent nova is a member of the Fe II class.
This suggests that more material has been ejected than in a typical
recurrent-nova outburst.  The lack of evolution in the spectrum
since those obtained by Duerbeck et al., in combination with the
very slow decline in brightness, implies that it is a 'slow'
recurrent nova and is retracing the outburst that occurred in 1920
(Elliot and Liller 1972, Ap.J. 175, L69).  This would make it only
the second slow nova among the class of recurrent novae (T Pyx
being the other) and well worth studying.  The light curve shown by
Elliot and Liller indicates that the nova's brightness remained
near maximum for > 60 days.  A 5000-s observation with the Chandra
satellite is planned beginning on Feb. 4.75, and we strongly
encourage observations at other wavelengths.  Follow-up
observations with Chandra will be scheduled if IM Nor is bright in
x-rays."
     Broadband-V magnitudes from W. Liller, Vina del Mar, Chile:
Jan. 20.312 UT, 8.75; 26.362, 8.13; 27.339, 8.60; 28.351, 8.42.
     Visual magnitude estimates (cf. IAUC 7796):  Jan. 21.803 UT,
8.7 (A. Pearce, Nedlands, W. Australia); 27.250, 9.2 (J. Garcia,
Rama Caida, Argentina); 30.840, 9.5 (Pearce); 31.837, 9.4 (Pearce);
Feb. 1.281, 9.3 (A. Amorim, Florianopolis, Brazil; moonlight);
2.309, 9.3 (Amorim); 2.834, 9.3 (Pearce); 3.340, 9.3 (Garcia);
3.832, 9.4 (Pearce).


SUPERNOVA 2002an IN NGC 2575
     A. Gal-Yam and O. Shemmer, Tel Aviv University, write:  "Full
reduction of a spectrum (range 400-780 nm) of SN 2002an (cf. IAUC
7805), obtained with the Wise Observatory 1-m telescope (+ FOSC
spectrograph) on Jan. 31 by J. Dann, shows a blue continuum.
Correcting for the redshift of the host galaxy (z = 0.013; NED
database), we also marginally detect a weak, narrow (FWHM about
1500 km/sec) H-alpha line in emission.  The spectrum is similar to
spectra of the type-IIn supernova 1998S (e.g., Fassia et al. 2001,
MNRAS 325, 907) around peak brightness."

                      (C) Copyright 2002 CBAT
2002 February 4                (7818)            Daniel W. E. Green

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