Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7893: XTE J0929-314; 2002ck

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 7892  SEARCH Read IAUC 7894

View IAUC 7893 in .dvi or .ps format.
IAUC number


                                                  Circular No. 7893
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)


XTE J0929-314
     R. A. Remillard, Massachusetts Institute of Technology; and J.
Swank and T. Strohmayer, Goddard Space Flight Center, NASA, report
the discovery of 185-Hz pulsations in XTE J0929-314 (IAUC 7889).
This source was observed in a brief pointed observation with RXTE
on May 2, while the average flux was 28 mCrab (2-30 keV).  A power
spectrum was computed for 800 s of PCA data, and a highly
significant pulsation is seen at 185.09 Hz, with a strong harmonic
at 370.18 Hz.  This is the third known pulsar in which pulsations
faster than 10 ms can be seen in the persistent x-ray emission.
Rasters across the source give an improved position R.A. =
9h29m18s, Decl. = -31o23'.1 (equinox J2000.0; systematic
uncertainty 1'), consistent with the optical candidate (IAUC 7889).
     M. P. Rupen, V. Dhawan, and A. J. Mioduszewski, National Radio
Astronomy Observatory, report the detection of a radio counterpart
to the x-ray transient XTE J0929-314 (IAUC 7888).  Observations
with the Very Large Array (VLA) at 4.86 GHz show a source with flux
density 0.31 +/- 0.07 mJy on May 3, and 0.36 +/- 0.05 mJy on May 7,
at R.A. = 9h29m20s.194, Decl. = -31o23'03".41 (equinox J2000.0;
uncertainty +/- 0".3).  This is 0".8 from the optical position
reported by Greenhill et al. (IAUC 7889) and provides strong
evidence that this optical identification is correct.  Further
optical and x-ray observations are strongly encouraged.
     P. Cacella, Brasilia, Brazil, reports that an unfiltered CCD
image taken with a 0.25-m reflector shows a variable (mag 18.3)
that is possibly the optical counterpart to XTE J0929-314 at
position end figures 20s.22, 03".6.


SUPERNOVA 2002ck IN UGC 10030
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
2002ck (cf. IAUC 7884), obtained by M. Calkins on May 2.45 UT with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph),
shows it to be a type-Ia supernova near maximum.  Adopting the
NASA/IPAC Extragalactic Database recession velocity of 8953 km/s
for the host galaxy, the supernova expansion velocity is about
10400 km/s for Si II (rest 635.5 nm) and 14400 km/s for Ca II (rest
395.1 nm).  The spectral-feature age of the supernova (cf. IAUC
7774) is 1 +/- 2 days before maximum light.

                      (C) Copyright 2002 CBAT
2002 May 7                     (7893)            Daniel W. E. Green

Read IAUC 7892  SEARCH Read IAUC 7894

View IAUC 7893 in .dvi or .ps format.


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


Valid HTML 4.01!