Central Bureau for Astronomical Telegrams
IAUC 6145: 1995H; N LMC 1995
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Circular No. 6145
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 TWX 710-320-6842 ASTROGRAM CAM
MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science)
SUPERNOVA 1995H IN NGC 3526
J. Mueller reports her discovery of a supernova of mag about
16 in NGC 3526 (R.A. = 11h07m.0, Decl. = +7o10', equinox 2000.0),
found on an IVN plate taken on Feb. 24 in the course of the second
Palomar Sky Survey by Mueller, D. Griffith, and J. D. Mendenhall;
SN 1995H is 17" west and 3" south of the galaxy's center. S.
Benetti, European Southern Observatory (ESO); M. Longhetti,
Osservatorio Astronomico di Brera; and G. Marconi, Osservatorio
Astronomico, Rome, report that preliminary inspection of a fully-reduced
CCD spectrogram (range 400-900 nm; resolution 0.6 nm) obtained on
Mar. 7.17 UT with ESO 1.5-m telescope (+ Boller & Chivens spectrograph),
shows that the object located 19".6 west and 7".5 south of
the galaxy's center is a type II supernova, 6-7 weeks after
outburst. Strong P-Cyg lines of H, Fe II (multiplets 40 and 42), Sc
II, Na I (D), O I (777.3 nm), and Ca II (infrared triplet) are
superimposed on a relatively red continuum (about 5800 K). The
expansion velocity deduced from the minima of the H-beta and H-
alpha lines is about 7300 km/s. CCD magnitude obtained of SN 1995H
on Mar. 7.21 with 1.54-m Danish telescope at La Silla: V = 16.0.
P. Garnavich, Center for Astrophysics, confirms the type-II
classification from a spectrogram obtained by J. Peters with the
Mt. Hopkins 1.5-m Tillinghast telescope on March 7.42; he notes
that there is significant contamination from H II emission in the
host galaxy. R. Stathakis, Anglo-Australian Observatory; and B.
Schmidt, Mount Stromlo and Siding Spring Observatories, report that
their spectrogram (range 320-900 nm) obtained on Mar. 7.56 at the
Anglo-Australian Telescope suggests that the type-II supernova is
about 3 weeks after explosion. They also note the P-Cyg profiles
of H-alpha, Ca II, and Fe II; the expansion rate of the photosphere,
derived from Fe II (516.9 and 501.8 nm), is 7000 km/s, and the
redshift of the host galaxy, measured from narrow H-alpha at the
position of SN 1995H, is 1450 km/s.
NOVA IN THE LARGE MAGELLANIC CLOUD 1995
Johnson UBV and Cousins RI photometry: Mar. 3.496 UT, V =
11.26, U-B = -0.42, B-V = +0.30, V-R = +0.22, V-I = +0.47 (A. C.
Gilmore, Mt. John University Observatory; through cirrus; comparison
stars Cousins CPD -68o311 and -65o443); 4.417, 11.42, -0.57, +0.20,
+0.27, +0.54 (Gilmore); 5.393, 11.75, -0.61, +0.28, -, - (G. W.
Christie, Auckland Observatory; comparison stars HD 37027 and HD
36584); 5.401, 11.75, -0.57, +0.23, -, - (Christie).
1995 March 7 (6145) Daniel W. E. Green
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