Central Bureau for Astronomical Telegrams
IAUC 5972: 1994K; 1994I
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Circular No. 5972
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
SUPERNOVA 1994K IN ANONYMOUS GALAXY
J. Mueller reports her discovery of a supernova of red mag
about 17.5 on a plate taken with the 1.2-m Oschin Schmidt Telescope
by D. Griffith and J. D. Mendenhall on Apr. 1 in the course of the
second Palomar Sky Survey. The supernova is located at R.A. =
9h57m43s.09, Decl. = +13o06'57".3 (equinox 1950.0), which is 22"
west and 15" north of the galaxy's nucleus.
B. Schmidt and R. Kirshner, Harvard-Smithsonian Center for
Astrophysics (CfA), report that a spectrum (320-850 nm) taken by J.
Huchra (CfA), C. Heller (University of Kentucky), and S. Muscarella
(CfA) with the Multiple Mirror Telescope (+ Blue Channel) shows
this object to be of type Ia, about 6 weeks past maximum light.
The redshift of the host galaxy, derived from its absorption lines,
yields a velocity of recession of 7000 km/s.
SUPERNOVA 1994I IN NGC 5194
A. Clocchiatti, M. Brotherton, R. P. Harkness, and J. C.
Wheeler, University of Texas, report: "A fully-reduced spectrogram
(range 459-998 nm, resolution 1.2 nm) of SN 1994I, obtained on
Apr. 8.24 UT at the 2.7-m telescope of McDonald Observatory, shows
several P-Cyg profiles superimposed on a blue continuum. Proposed
identifications of the features and wavelengths of the blueshifted
absorptions are: Fe II at 478.0 and 496.0 nm; He I 587.6-nm at
569.3 nm, perhaps blended with Na D; Si II 635.5-nm at 616.5 nm;
O I 777.4-nm at 755.1 nm; and Ca II 849.8-, 854.2-, and 866.2-nm at
817.8 nm. Superimposed on the redshifted maximum of the feature at
616.5 nm (Si II), there are two weak and broad absorption troughs
with minima at 639.2 and 647.7 nm. If the feature at 647.7 nm is
associated with He 667.8-nm, then its velocity matches that of He I
587.6-nm (about -10 000 km/s). The He features are weak and the
spectrum broadly resembles the spectra of SN 1983V and SN 1987M at
early phases. SN 1994I, then, should be classified as a type-Ic
event (cf. IAUC 5966). Observations over all wavelengths are
strongly recommended, especially of Paschen-alpha and Paschen-beta,
low-resolution infrared spectroscopy targeting He I 108.3- and
206.0-nm, and high-resolution optical spectroscopy of the strong
interstellar absorption Na D lines, which appear redshifted by
about 420 km/s."
H. Mikuz, Ljubljana, Slovenia, provides the following CCD
photometry (comparison-star magnitudes from H. Corwin): Apr. 7.88
UT, V = 13.05 +/- 0.03, B-V = +0.51 +/- 0.05.
1994 April 11 (5972) Daniel W. E. Green
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