Central Bureau for Astronomical Telegrams
IAUC 4515: 1987N; 1987A; Prob. NOVAE IN M31; V482 Cyg
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Circular No. 4515
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
SUPERNOVA 1987N IN NGC 7606
G. Mackie, S. Ryan and R. Brissenden, Mt. Stromlo and Siding
Spring Observatories, report: "The spectrum of SN 1987N has been
obtained with the double-beam spectrograph on the Australian
National University's 2.3-m telescope. The observations were made
on Dec. 15.45 UT at 0.5-nm resolution over the wavelength range
460-880 nm. A very strong absorption feature at 615 nm is
identified as due to silicon with FWHM 6500 km/s. In addition,
absorption features at 539 and 488 nm identified with sulphur and
iron imply a type Ia class. No strong hydrogen is seen, and we
suggest that Schwarz et al. (IAUC 4514) have misinterpreted the
silicon feature as the blueshifted edge of H alpha."
E. Cappellaro, M. Della Valle and M. Turatto, Asiago
Astrophysical Observatory, also report that the typical absorption
feature at 615 nm indicates that SN 1987N is of type Ia, approximately
a week after maximum. CCD spectra (range 410-720 nm) were
obtained with the 1.82-m telescope at Asiago on Dec. 17.
Visual magnitude estimates: Nov. 12 UT, [15.5 (R. O. Evans,
Hazelbrook, N.S.W.); 20, [15.5 (Evans); Dec. 16.47 UT, 14.0 (R. H.
McNaught, Siding Spring Observatory).
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
Corrigendum. On IAUC 4514, the emissions shown as [C III], [N
III] and [N IV] should be C III], N III] and N IV], respectively.
Visual magnitude estimates by A. C. Beresford, Adelaide, S.
Australia: Dec. 17.46 UT, 6.2; 18.49, 6.3; 19.48, 6.3.
PROBABLE NOVAE IN M31
J. Bryan, Georgetown, TX, reports his discovery of two probable
novae in M31, both at mpg = 17.5 on Nov. 21.20 UT (Tri-X film,
0.41-m reflector). The two objects are located at R.A. = 0h39m26s, Decl.
= +40 54'.4 and R.A. = 0h40m47s, Decl. = +40 57'.9 (equinox 1950.0).
V482 CYGNI
The fading of this R CrB-type variable (cf. IAUC 4511) has
been independently reported visually by T. Kato, Kyoto, Japan, and
photographically by E. P. Belserene, Maria Mitchell Observatory.
1987 December 19 (4515) Brian G. Marsden
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