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IAUC 5167: 1991C; N Mus 1991; AX Per

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                                                  Circular No. 5167
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. Mueller reports her discovery of a supernova in an anonymous
galaxy at R.A. = 11h30m06s, Decl. = +5 37'.5 (equinox 1950.0).  The
supernova (blue mag about 18), located 5".4 east and 4".7 south of
the galaxy's nucleus, was found on a plate taken Jan. 15 UT by C.
Brewer and J. D. Mendenhall with the 1.2-m Oschin Schmidt Telescope
in the course of the second Palomar Sky Survey.  A spectrogram
obtained Jan. 17 with the 5-m Hale Telescope (+ double spectrograph)
by J. R. Mould and J. B. Oke shows H-alpha emission (redshift about
8500 km/s; width of profile at base 7000 km/s), indicating a type-II
supernova.  The emission line profile is not like that of P Cyg.
Calcium triplet emission was also observed.

     M. Della Valle, European Southern Observatory; and M. Pakull,
Landessternwarte Konigstuhl, Heidelberg, report:  "Preliminary analysis
of high-quality CCD spectra (total integration time 3 hr), obtained
on Jan. 16.3 and 17.2 UT with the 1.5-m telescope (+ Boller
and Chivens spectrograph; range 360-590 nm, resolution about 0.3 nm)
at La Silla, show a shallow absorption due to H-beta, filled in with
a central emission (equivalent width = 0.16 nm, FWHM = 1.5 nm), and
He I (587.6 nm, EW = 0.07 nm, FWHM = 1.9 nm), He II (468.6 nm, EW =
0.25 nm, FWHM = 2.2 nm), N III (464.0, EW = 0.30 nm), and H-gamma
emission lines.  These features are superimposed on a blue continuum.
From a detailed inspection of the spectrum obtained at the New
Technology Telescope on Jan. 15.3 (IAUC 5165), we confirm the strong H-
alpha emission and also find the emission lines reported above.  The
spectrum of Nova Mus 1991 fits well the spectroscopic properties of
the optical counterparts of x-ray novae (V616 Mon, V2107 Oph, Cen X-4,
V404 Cyg)."

     This cataclysmic variable has recovered from its recent eclipse,
as indicated by the following visual magnitude estimates (cf. IAUC
5126):  1990 Nov. 4.82 UT, 11.8 (A. Boattini, Piazzano, Italy);
24.09, 12.8 (P. Schmeer, Bischmisheim, Germany); Dec. 5.16, 12.6 (P.
Sventek, Houston, TX); 1991 Jan. 1.82, 12.3 (Schmeer); 5.00, 12.1
(J. E. Bortle, Stormville, NY); 13.83, 11.2 (A. Pereira, Cabo da
Roca, Portugal); 15.98, 11.5 (Bortle).

1991 January 17                (5167)             Daniel W. E. Green

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