Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6827: 4U 1630-47; 80P; 43P

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 6826 SEARCH Read IAUC 6828

View IAUC 6827 in .dvi or .ps format.
IAUC number 

                                                  Circular No. 6827
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)


4U 1630-47
     R. M. Hjellming, National Radio Astronomy Observatory; and E. Kuulkers,
Oxford University, report: "Using the VLA we have detected a possible
variable radio counterpart to the recurring x-ray transient
4U 1630-47 (IAUC 6822, 6823).  On Feb. 10.6, 12.6, 14.6, 21.6 and 25.5 UT
a radio source at a position of R.A. = 16h34m01s.61 +/- 0s.05,  Decl. =
-47d23'32" +/- 2" (equinox 2000.0) had 4.9-GHz fluxes of < 1 ,
1.1 +/- 0.3, 1.4 +/- 0.3, 1.3 +/- 0.3 and 0.5 +/- 0.3 mJy, respectively.
These flux levels, together with the upper limits of 0.7 mJy at 8.6 GHz
from Kuulkers et al. (IAUC 6822) on Feb. 9.1 and 9.8, may indicate the
variability needed to identify this radio candidate as the counterpart of
the 1998 outburst in 4U 1630-47.  The position of the radio source is
consistent with the Einstein HRI x-ray position of R.A. =
16h34m01s.3, Delta = -47d23'34".3 (equinox 2000.0) reported by Parmar
et al. (1997, A.Ap. 319, 855)."
     M. Buxton and R. Sood, Australian Defence Force Academy; D. Rayner,
University of Tasmania; T. Tzioumis, Australia Telescope National
Facility; E. Kuulkers, Oxford University; S. Dieters, University of
Alabama; and P. Durouchoux, Centre d'Etudes de Saclay, report: "Following
earlier radio observations with the ATCA on Feb. 9.1 and 9.8 UT that set
an upper limit of 0.7 mJy (IAUC 6822), a positive flux has been detected
from within the x-ray error circle of 4U 1630-47 during Feb. 17.57-17.92.
The coordinates of the radio source are R.A. = 16h34m01s.6, Decl. =
-47d23'34" (equinox 2000.0).  The observed flux and polarization were:
at 4800 MHz (6 cm), 2.6 +/- 0.3 mJy, 26 percent; at 8640 MHz (3 cm),
1.9 +/- 0.1 mJy, 28 percent."


COMET 80P/PETERS-HARTLEY
     CCD observations by C. Veillet with the Canada-France-Hawaii Telescope:
Feb. 16.47 UT, R = 20.4; 17.51, 20.4; 18.58, 20.4.


COMET 43P/WOLF-HARRINGTON
     Total visual magnitude estimates: 1997 Nov. 12.19 UT, 12.7 (R. J. Bouma,
Groningen, The Netherlands, 0.25-m reflector); Dec. 2.79, 12.8 (A. Pearce,
Nedlands, Western Australia, 0.20-m reflector); 7.11, 12.3 (T. Karhula,
Virsbo, Sweden, 0.44-m reflector); 27.61, 12.8 (N. Biver, Oahu, HI,
0.26-m reflector); 1998 Jan. 5.60 (D. A. J. Seargent, Cowra, New South Wales,
0.25-m reflector); 20.55 13.3: (M. Mattiazzo, Wallaroo, South Australia,
0.20-m reflector); 29.96, 12.5: (K. Hornoch, Lelekovice, Czech Republic,
0.35-m reflector); Feb. 17.53, 13.0: (Mattiazzo).

                      (C) Copyright 1998 CBAT
1998 February 28               (6827)              Brian G. Marsden

Read IAUC 6826 SEARCH Read IAUC 6828

View IAUC 6827 in .dvi or .ps format.

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

Valid HTML 4.01!