IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 8146: eta Car; 2003fa; 2003fb, 2003fc

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 8145  SEARCH Read IAUC 8147

View IAUC 8146 in .dvi or .ps format.
IAUC number


                                                  Circular No. 8146
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


eta CARINAE
     M. F. Corcoran, Universities Space Research Association and
Goddard Space Flight Center, reports that monitoring observations
with the Rossi X-ray Timing Explorer (+ Proportional Counter Array)
of eta Car show an x-ray maximum on May 26 (about 5 days earlier
than the predicted maximum; cf. IAUC 8137).  Since that time, the
x-ray flux has declined by 49 percent, and it is likely that the
x-ray eclipse ingress has begun.  A straight-line fit to the data
since June 4 suggests that the x-ray minimum will occur on June 11
+/- 2 days (formal error) if the decline remains linear.  This is
more than a month earlier than the previous predicted eclipse start
(IAUC 8137).  Additional ground-based observations are strongly
encouraged.


SUPERNOVA 2003fa IN MCG +07-36-33
     Further to IAUC 8142, T. Matheson et al. add that a spectrum
(range 370-750 nm) of the nucleus of MCG +07-36-33, obtained by P.
Berlind on June 6.37 UT, indicates that the galaxy has a recession
velocity of 11800 km/s (so the NED value is in error) and thus is
likely the host of SN 2003fa.


SUPERNOVAE 2003fb AND 2003fc
     M. Hamuy, Carnegie Observatories, reports that a spectrum
(range 380-930 nm) of SN 2003fb (cf. IAUC 8143), obtained on June
7.33 UT with the Las Campanas Observatory Dupont 2.5-m telescope (+
WFCCD), confirms that this is a type-II supernova with well-
developed Balmer lines exhibiting P-Cyg profiles.  The minimum of
the H_beta line yields an expansion velocity of -7054 km/s
(adopting the NED host-galaxy recession velocity of 5259 km/s).  A
spectrum of SN 2003fc (cf. IAUC 8143), obtained on June 7.37, bears
resemblance to that of the type-Ic SN 1994I obtained 4 days before
maximum light.  Superimposed narrow H_alpha emission from the host
galaxy yields a redshift of 0.035.
     R. J. Foley, K. M. Sandstrom, W. Li, and A. V. Filippenko,
University of California, Berkeley, report that CCD spectra (range
320-1000 nm), obtained on June 7 UT with the Shane 3-m telescope at
Lick Observatory, reveal that SN 2003fc is probably of type Ic near
maximum brightness.  There is a low-contrast, broad emission
feature at the expected position of H_alpha, as is sometimes the
case in type-Ic supernovae (e.g., Filippenko 1992, Ap.J. 384, L37).
The recession speed of the host galaxy, measured from the narrow
H_alpha emission of a superposed H II region, is about 10400 km/s.

                      (C) Copyright 2003 CBAT
2003 June 8                    (8146)            Daniel W. E. Green

Read IAUC 8145  SEARCH Read IAUC 8147

View IAUC 8146 in .dvi or .ps format.


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


Valid HTML 4.01!