Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 8376: 2004di; 2004dg; 2004ct, 2004dh

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 8375  SEARCH Read IAUC 8377

View IAUC 8376 in .dvi or .ps format.
IAUC number

                                                  Circular No. 8376
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2004di IN UGC 10097
    Independent discovery reports of an apparent supernova have
been received from M. Armstrong (Rolvenden, U.K., 0.35-m reflector)
and R. Arbour (South Wonston, U.K., 0.3-m reflector).  Armstrong
reports the new object's position as R.A. = 15h55m41s.02, Decl. =
+47o51'49".1 (equinox 2000.0), which is approximately 23" west and
11" south of the center of UGC 10097; Arbour's measured position
end figures are 40s.98, 48".8.  Unfiltered CCD magnitudes of SN
2004di:  July 14 UT, [19.0 (Armstrong); 18.922, [17.5 (Arbour);
26.903, 17.0 (Armstrong); 27.891, 17.0 (Armstrong); 27.911, 16.8
(Arbour).  Nothing was visible at this position on Palomar Sky
Survey images from 1989 and 1993 (red limiting mag 20.8; blue
limiting mag 22.5).

    N. Elias de la Rosa, S. Benetti, H. Navasardyan, F. Bufano, A.
Harutyunyan, G. Blanc, and M. Turatto, Osservatorio Astronomico di
Padova; A. Pastorello, Osservatorio Astrofisico di Arcetri; and E.
Cappellaro, Osservatorio Astronomico di Capodimonte, report that
inspection of a spectrogram, obtained on July 21.87 UT with the
Asiago 1.8-m telescope (+ AFOSC; range 355-780 nm, resolution 2.4
nm), indicates that SN 2004dg (cf. IAUC 8375) is a type-II
supernova, about 1 month after explosion.  The spectrum is
dominated by P-Cyg lines of H I, Ca II H and K, Fe II, and Ti II.
A narrow H_alpha feature (from a nearby H II region) is visible on
the top of the broad emission, from which the observers deduce a
recession velocity of about 1720 km/s, which in turn is
substantially higher than the galaxy's recession velocity given by
NED (1359 km/s).  The expansion velocities deduced from the H_alpha
and H_beta absorptions are about 8270 and 6760 km/s, respectively.

SUPERNOVAE 2004ct AND 2004dh
    T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 340-730 nm)
of SN 2004ct (cf. IAUC 8361), obtained by M. Calkins on July 22.28
UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST),
shows it to be a type-Ia supernova several weeks past maximum.  A
spectrogram of SN 2004dh (cf. IAUC 8375), obtained by Calkins on
July 23.44, shows it to be a type-II supernova.  The spectrum
consists of a blue continuum with P-Cyg lines of hydrogen.
Adopting the NED recession velocity of 5794 km/s for the host
galaxy, the expansion velocity derived from the minimum of the
H_beta line is 9500 km/s.

                      (C) Copyright 2004 CBAT
2004 July 27                   (8376)            Daniel W. E. Green

Read IAUC 8375  SEARCH Read IAUC 8377

View IAUC 8376 in .dvi or .ps format.

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

Valid HTML 4.01!