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IAUC 6880: 1998ar; 1998aq; AX J0051-73.3 = RX J0050.7-7316

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                                                 Circular No. 6880
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1998ar IN NGC 2916
     J.-Y. Wei, Beijing Astronomical Observatory (BAO), write:  "A
low-resolution spectrum (range 370-850 nm) of SN 1998ar (IAUC 6877)
was obtained on Apr. 18 with the BAO 2.16-m telescope.  The
spectrum shows a blue continuum and strong, broad H-alpha and
H-beta emissions with P-Cyg profiles, from which SN 1998ar is
classified as a type-II supernova around its maximum.  The
recession velocity of the galactic disk near SN 1998ar is 3750
km/s, as deduced from the narrow H-alpha emission.  The expansion
velocity derived from the H-alpha P-Cyg profile is about 8000 km/s.
There are possible H-alpha and H-beta absorptions from the host
galaxy, but a spectrum with higher S/N ratio is needed to confirm
these."


SUPERNOVA 1998aq IN NGC 3982
     P. Garnavich, S. Jha, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that CCD images obtained by K.
Stanek with the Fred L. Whipple Observatory's 1.2-m telescope shows
that SN 1998aq continues to brighten rapidly.  Standard V magnitude
estimates relative to the star (V = 13) located 16" west and 200"
south of the supernova are:  Apr. 17.14 UT, +0.35; 18.14, +0.07;
19.14, -0.14; 20.16, -0.33; this corresponds to a rise of nearly a
factor of two in 3 days.  Spectra obtained with the 1.5-m
Tillinghast telescope by P. Berlind and M. Calkins over the same
period shows unusually shallow type-Ia features and a weak Si II
absorption with a minimum at 611.7 nm (host galaxy rest frame).
The spectrum is very similar to that of SN 1990N, one week before B
maximum (Leibundgut et al. 1991, Ap.J. 371, L23).
     Visual magnitude estimates:  Apr. 15.91 UT, 14.2 (K. Hornoch,
Lelekovice, Czech Republic); 15.93, 14.0 (G. Hurst, Basingstoke,
England); 15.96, 14.1 (J. Shanklin, Cambridge, England); 17.20,
13.7 (C. E. Spratt, Victoria, BC); 17.83, 13.1 (M. Plsek,
Lelekovice, Czech Republic); 17.98, 12.8 (Shanklin); 19.89, 12.7
(P. Schmeer, Bischmisheim, Germany).


AX J0051-73.3 = RX J0050.7-7316
     P. C. Schmidtke and A. P. Cowley, Arizona State University,
report:  "The optical counterpart of RX J0050.7-7316 (IAUC 6853,
6854, 6860) was identified with a variable peculiar Be star in the
Small Magellanic Cloud by Cowley et al. (1997, PASP 109, 21).  Its
optical position is R.A. = 0h50m44s.8, Decl. = -73o16'06" (equinox
J2000.0), with mean values of V = 15.4, B-V = -0.04, and U-B =
-0.95 (epoch Nov. 1994)."

                      (C) Copyright 1998 CBAT
1998 April 20                  (6880)            Daniel W. E. Green

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