Central Bureau for Astronomical Telegrams
IAUC 4695: PSR 0833-45; V744 Her; ERUPTIVE OBJECT IN Crt
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Circular No. 4695
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
PSR 0833-45
C. Flanagan, Hartebeesthoek Radio Astronomy Observatory,
Johannesburg, reports: "A large spin-up of the Vela pulsar PSR 0833-45
has been observed at Hartebeesthoek and confirmed by P. Hamilton at
Hobart. This is the eighth such event seen in this pulsar in the past
20 years. Fits to the five days before and the first day immediately
after the 'glitch' yield the following parameters: 10**6 dP/P = -1.806
+/- 0.002, dP'/P' = +0.079 +/- 0.015, Epoch = JD 2447520.303. X-ray
observations of the pulsar at this time would be useful."
V744 HERCULIS
V. Doazan, Paris Observatory; E. Arsenijevic, Belgrade
Observatory; R. Dummler, Astronomical Institute, Munster; and J. F.
Lahulla, Madrid Observatory, report: "The brightness of V744 = 88 Her,
which increased from 1978 to 1983 in both the far ultraviolet and
visual regions (Barylak and Doazan 1986, A.Ap. 159, 65), reached a
maximum in 1985 (V = 6.55) and then decreased substantially in both
spectral regions (V = 6.85). The decrease in brightness was
accompanied by an increase in visual linear polarization, behavior
that strongly contrasts with the variability pattern observed during
1968-1972. Further spectroscopic, photometric and polarimetric
observations are needed."
ERUPTIVE OBJECT IN CRATER
G. M. Hurst, Basingstoke, England, informs us that R. Fleet,
Harare, has reported an outburst of an eruptive variable he originally
discovered in 1986 (Fleet 1988, The Astronomer 24, 177), and the
position of which has been measured by A. Young, Burwash, as R.A. =
11h32m14s.98, Decl. = -11d28'53".1 (equinox 1950.0). Fleet's recent
magnitude estimates are: Dec. 21.07 UT, 14.9; 23.01, 13.5; 25.07, 13.5;
26.15, 12.6. Other maxima have been recorded near mv = 12.7 on 1986
Nov. 9, 1987 Feb. 10, 1987 May 26 and 1988 Apr 23, and Fleet notes that
the star is bright on the Palomar Sky Survey. Hurst notes that the variable
is not present on the Atlas Stellarum to a limit of B about 14.0 (1970
Feb. 8) but that there is a possible image near the limit of the Lick
Atlas at mag about 15 (1955 Feb 22).
1988 December 27 (4695) Brian G. Marsden
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