Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6145: 1995H; N LMC 1995

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 6144  SEARCH Read IAUC 6146

View IAUC 6145 in .dvi or .ps format.
IAUC number

                                                  Circular No. 6145
Central Bureau for Astronomical Telegrams
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

     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.

      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

Read IAUC 6144  SEARCH Read IAUC 6146

View IAUC 6145 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!