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IAUC 3580: SN IN NGC 4536; NO N IN Cam; rho Cas; SN IN NGC 1532

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IAUC number

                                                  Circular No. 3580
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758

     E. P. Aksenov, Sternberg Astronomical Institute, reports the
discovery by Tsvetkov of a supernova 36" east and 36" north of the
nucleus of NGC 4536 (R.A. = 12h32m.0, Decl. = +2o28', equinox 1950.0).  On
Mar. 2 the photographic magnitude was 12.3.

     C.-Y. Shao, Center for Astrophysics, informs us that examination
of Damon sky-patrol plates at the Agassiz Station on 1980 Oct.
5, Nov. 6 and Dec. 4 reveals no stars of mpg <= 13 at the position
of the possible nova reported on IAUC 3578.  The Nov. 6 exposure
was of 38-min duration centered at 7h12m UT, only two hours after
the exposure at the Allegheny Observatory.

     K. H. Hinkle, Kitt Peak National Observatory; D. L. Lambert
and J. Tomkin, University of Texas at Austin; and R. E. Luck,
Louisiana State University, write that they observed rho Cas = HR
9045 during Feb. 23-26.  The circumstellar line profiles now contain
a striking emission component.  The circumstellar CO vibration-rotation
band heads near 2.3 um, which were previously seen in absorption,
are now in emission.  Low J CO lines show the emission
superposed on an absorption line.  Similar profiles are seen in
many neutral atomic lines in the red and near infrared.  While the
profiles of the circumstellar lines have developed strong emission
since they were last observed in June 1980, the current phase may
have begun in Sept. 1979 when the photospheric lines were observed
to double.  Photometric and spectroscopic monitoring of this peculiar
supergiant would be of interest.

     S. Lee and T. Cragg, Anglo-Australian Observatory, telex that
photometric observations by Carignan on Mar. 3.4 UT with the 1.0-m
telescope of the Australian National Observatory gave magnitude f =
13.399 and j-f = +1.069, where j and f mimic the responses of IIIa-J
and IIIa-F emulsion-filter combinations.  Visual observations by
Cragg on Mar. 2.5 and 4.4 UT gave mv ~ 13.5.

1981 March 9                   (3580)              Brian G. Marsden

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