Central Bureau for Astronomical Telegrams
IAUC 5013: Millisec PULSAR IN NGC 6539; PSR 1908+00; 1989e1
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Circular No. 5013
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
MILLISECOND PULSAR IN NGC 6539
N. D'Amico, University of Palermo; A. G. Lyne, M. Bailes,
and S. Johnston, University of Manchester, Jodrell Bank; R. N.
Manchester and L. Staveley-Smith, Australia Telescope National
Facility, CSIRO; J. Lim, Macquarie University; A. S. Fruchter,
Carnegie Institution of Washington; and W. M. Goss, Very Large
Array, National Radio Astronomy Observatory, telex: "We report
the discovery at the Parkes Radio Telescope of a millisecond
binary pulsar in the globular cluster NGC 6539. The pulsar has a
period of 23.10 ms, dispersion measure of 187 +/- 2 cmE-3 pc and
20-cm flux density of 0.8 mJy. It is in an orbit of period 2.62
days and eccentricity 0.22 with a mass function of 0.0097 solar
mass. Within the uncertainties, the 20-cm flux density of the
pulsar is equal to those of two continuum sources detected at the
Very Large Array and located within 40" of the cluster center.
The source closer to the cluster center has shown significant
intensity variations and is probably the pulsar."
PSR 1908+00
S. Anderson, S. Kulkarni, and T. Prince, California Institute
of Technology; and A. Wolszczan, Arecibo Observatory, write: "We
report the discovery of a 3.6-ms binary pulsar at a dispersion
measure of 200 +/- 10 pc cmE-3 in the globular cluster NGC 6760.
Observations were made with the 305-m Arecibo reflector at 1415 MHz
on 1987 Dec. 29. A 2E23 sample time series was formed from a 1.2-hr
observation and subject to standard pulsar signal detection analysis.
Following a preliminary detection, a search was made over a range of
accelerations. The signal peaks at an acceleration of -2.8 m sE-2,
indicating that the pulsar is in a binary system. The pulsar has
been detected at a consistent dispersion measure in several
observations made during 1989 Sept. at Arecibo."
COMET SKORICHENKO-GEORGE (1989e1)
Total visual magnitude estimates (cf. IAUC 4984):
Mar. 29.82 UT, 8.9 (O. Midtskogen, Tranby, Norway, 0.32-m reflector);
Apr. 7.88, 10.2 (H. Dahle, Oslo, Norway, 0.20-m reflector);
13.81, 9.7 (A. Boattini, Monte Morello, Italy, 20x80 binoculars);
22.17, 9.8 (C. S. Morris, Pine Mountain Club, CA, 0.26-m reflector);
May 1.86, 10.6 (J. Jahn, Bodenteich, W. Germany, 0.20-m reflector).
1990 May 16 (5013) Daniel W. E. Green
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