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IAUC 7789: IM Nor; 2002A; PECULIAR Var IN Mon

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                                                  Circular No. 7789
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     W. Liller, Vina del Mar, Chile, reports that he has detected
an apparent outburst of the old nova IM Nor (Woods and Bailey 1920,
HCO Bull. 734) at red mag 8.3 on Technical Pan photographs taken
during Jan. 10.343-10.360 UT with an 85-mm f/1.4 lens (+ orange
filter); the star was subsequently found at mag approximately 8.5
at the very edge of another pair of photographs taken on Jan. 3.348
and 3.349.  Nothing was visible at the position of this star on
2001 Oct. 13 (limiting mag 11.5).  A CCD image taken by Liller on
Jan. 12.330 with a 0.20-m f/1.5 Schmidt camera (with a minus-red-
and-infrared filter) yields broadband V = 8.13 +/- 0.03 and the
following precise position for the nova:  R.A. = 15h39m26s.61 +/-
0s.18, Decl. = -52o19'18".6 +/- 0".5 (equinox 2000.0); Woods'
position from a 1920 plate is R.A. = 15h39m27s, Decl. = -52o19'.4.
A low-dispersion objective prism spectrum, taken by Liller on Jan.
12.351, shows H-alpha to be very strong and relatively narrow with
FWHM = 950 +/- 50 km/s.  Other lines of the Balmer series, the Fe
II multiplets 42 and 74, and O I at 777.1 nm are also clearly
present.  Elliot and Liller (1972, Ap.J. 175, L69) suggested a
possible link between the x-ray source 2U 1536-52 and IM Nor, and
they found no other outburst of the nova on Harvard plates taken
during 1894-1954.  No known spectroscopic observations of IM Nor
were previously ever made.

     S. Benetti, G. Altavilla, A. Pastorello, M. Turatto, S.
Desidera, R. Brunino, M. De Checchi, and S. Villanova, Padova; and
E. Cappellaro, Osservatorio Astronomico di Capodimonte, write:  "A
spectrum (range 400-780 nm, resolution 2.5 nm) of SN 2002A (cf.
IAUC 7786), obtained on Jan. 11.12 UT with the Asiago 1.82-m
telescope (+ AFOSC), shows that it is a type-IIn supernova soon
after explosion.  The spectrum is dominated by narrow (FWHM 1200
km/s) Balmer emission lines with broader wings.  The spectrum also
shows a relatively blue continuum.  A recession velocity of 2650
km/s is derived from the emission-line positions."
     P. Antonini, Avignon, France, reports that SN 2002A is present
on an unfiltered CCD image taken with a 0.3-m reflector on Jan.
9.99 UT at mag about 16.6 and position R.A. = 7h22m35s.46, Decl. =
+71o35'41".8 (equinox 2000.0)

     Corrigendum.  On IAUC 7785, line 8, FOR  Oksanan  READ  Oksanen

                      (C) Copyright 2002 CBAT
2002 January 12                (7789)            Daniel W. E. Green

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