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IAUC 5558: GK Per; 1992ae; 1992af; N Sco 1992

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IAUC number

                                                  Circular No. 5558
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     J. A. Mattei, AAVSO, reports that GK Per has brightened
significantly for the first time in about 3 years.  Selected visual
magnitude estimates:  1991 Sept. 8.92 UT, 13.0 (A. Boattini,
Florence, Italy); 1992 Jan. 29.96, 13.1 (B. H. Granslo, Fjellhamar,
Norway); Feb. 7.82, 13.2 (P. Schmeer, Bischmisheim, Germany); July
3.31, 12.3 (J. Bortle, Stormville, NY); 4.38, 12.3 (M. Adams,
Melbourne, FL); 5.38, 12.1 (Adams); 6.38, 11.8 (Adams).

     M. Della Valle, European Southern Observatory; and A.
Bianchini, Department of Astronomy, University of Padua, report:
"Preliminary analysis of a spectrogram (range 380-840 nm, resolution
about 2 nm), obtained with the 1.52-m telescope at La Silla on
July 5.4 UT, shows SN 1992ae (cf. IAUC 5554) to be a type-I supernova.
The expansion velocity deduced from the minimum of the Si II
635-nm absorption is about 7500 km/s.  The spectrum bears a strong
similarity to that of SN 1990N (Leibundgut et al. 1991, Ap.J. 371,
L23), which might suggest a pre-maximum type Ia supernova.  The H-
alpha emission of the galaxy gives a redshift of z about 0.07."

SUPERNOVA 1992af IN 340-G38
     Della Valle and Bianchini also communicate:  "Inspection of a
spectrogram, obtained as described above on July 5.3 UT under
nonphotometric conditions, shows SN 1992af (cf. IAUC 5554) to be a
type-II supernova.  The spectrum is dominated by the emission of H-
alpha and H-beta coupled with a P-Cyg profile.  The expansion velocity
corresponding to the difference between the rest wavelength in
the galaxy's frame and the minimum of the absorption is about 8500
km/s.  Assuming the H-alpha emission line at the rest wavelength in
the galaxy's frame, a redshift of z about 0.02 was estimated from
the same spectrum."

     W. H. Allen, Carter Observatory, forwards additional photometric
measurements obtained at Adams Lane Observatory (cf. IAUC 5536,
5550, etc.):  June 26.37 UT, V = 8.03, B-V = +1.06, U-B = +0.05;
30.37, 8.03, +1.00, -0.05; July 1.30, 7.77, +1.01, -0.03; 6.33,
9.34, +0.82, -0.14.

1992 July 6                    (5558)            Daniel W. E. Green

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