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IAUC 5287: 1991ag; 1991af; 1991ae; 1991T

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IAUC number

                                                  Circular No. 5287
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

SUPERNOVA 1991ag IN IC 4919
     M. M. Phillips, Cerro Tololo Interamerican Observatory; and J.
Maza, University of Chile, report:  "Roberto Antezana (University of
Chile) has discovered a supernova located about 10" west and 33"
north of the nucleus of IC 4919 (ESO 185-G43; R.A. = 19h56m11s,
Decl. = -55 30'.7, equinox 1950.0).  The supernova (mpg about 15)
was found on a 20-min unfiltered IIa-O plate taken by M. Hamuy
(CTIO) with the CTIO Curtis Schmidt telescope on June 9.19 UT.  The
ninth-magnitude star SAO 246378 is located 50" east of the galaxy
nucleus.  A CCD spectrum (range 325.0-750.0 nm) obtained on June
12.2 by Phillips with the CTIO 4.0-m telescope shows that this is a
type-Ia supernova about 1 week past blue maximum.  A spectrum of
the nucleus of IC 4919 obtained with the same telescope and
instrument yields a redshift of 0.0144."

     W. Sargent and M. Strauss report:  "After further examination
of the spectra obtained using the Double Spectrograph at Palomar
(cf. IAUC 5282), where we reported SN 1991af as being type II, we
revise our classification of this object.  B. Schmidt, Center for
Astrophysics, notes that the spectrum is very similar to that of SN
1989E (type Ib) 75 days after maximum."

SUPERNOVA 1991ae IN MCG +11-19-018
     Sargent and Strauss also note:  "The spectrum of SN 1991ae
shows the Balmer series (H-alpha, H-beta, H-gamma, H-delta) and He I
at 587.6 nm in emission.  The lines are narrow, about 900 km/s FWHM,
and show an unresolved weak absorption feature 900 km/s blueward of
the line peak.  None of the lines shows a P-Cyg profile; this
spectrum is unlike any we have seen before."

     Visual magnitude estimates (cf. IAUC 5270):  May 18.16 UT, 12.3
(W. Wren, near Ft. Davis, TX); 19.35, 12.4 (A. Hale, Las Cruces, NM);
20.9, 12.4 (M. Villi and G. Cortini, Mt. Colombo, Italy); 21.91,
12.4 (A. Pereira, Caxias, Portugal); 26.18, 12.7 (Wren); 30.16, 12.9
(Hale); June 1.23, 12.9 (C. S. Morris, Lockwood Valley, CA); 3.92,
13.4 (P. Schmeer, Bischmisheim, Germany); 5.90, 13.5 (S. Korth,
Dusseldorf, Germany); 9.15, 13.7 (Wren).

1991 June 12                   (5287)             Daniel W. E. Green

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