Central Bureau for Astronomical Telegrams
IAUC 3765: 1983b; LMC X-3; NEW BRIGHT Ca II-EMISSION STAR
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Read IAUC 3766
Circular No. 3765
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
PERIODIC COMET PONS-WINNECKE (1983b)
Independent recoveries of this comet have been made by E.
Everhart at the University of Denver's field station and by T.
Seki at Geisei. Everhart described the comet's image as definite,
but extremely faint, while Seki reported the comet as diffuse with
condensation. The comet's position is in close agreement with the
ephemeris on MPC 7029-7030 (elements on MPC 7021).
1983 UT R.A. (1950.0) Decl. m1 Observer
Jan. 12.50590 15 48 44.55 - 1 49 43.2 19 Everhart
14.85035 15 55 50.0 - 2 17 23 19 Seki
19.50347 16 10 10.73 - 3 12 10.5 19 Everhart
20.84201 16 14 22.04 - 3 27 43.5 18.5 Seki
20.85868 16 14 24.9 - 3 27 56 "
LMC X-3
M. van der Klis and J. van Paradijs, Astronomical Institute,
University of Amsterdam, communicate: "Photometric observations of
the optical counterpart of LMC X-3 were made during 1981 Dec. 6-18
using the Danish 1.5-m telescope at the European Southern Observatory.
The B magnitude is variable over a range of 0.2 mag around
an average value of 17.2. Thus the star was fainter by ~ 0.4 mag
than when it was observed by Warren and Penfold (1975, M.N.R.A.S.
172, 41P). The brightness variations may be ellipsoidal: after
folding the data using the ephemeris of Cowley et al. (preprint;
IAUC 3751) we find that the star is systematically brighter at
quadratures and fainter at inferior conjunction of the x-ray
source; the depth of this minimum is 0.15 mag. Very few data
points were taken around superior conjunction of the x-ray source;
these do not show evidence for a minimum in the lightcurve."
NEW BRIGHT Ca II-EMISSION STAR
W. P. Bidelman, Warner and Swasey Observatory, writes: " The
bright (V = 5.92) northern K giant HR 454 = HD 9746 shows strong
Ca II emission on recent 10-degree-objective-prism plates taken with
the Burrell Schmidt. Since many stars of similar spectra have proved
to be RS CVn variables, it may be significant that this object is
located < 1 degree from the somewhat uncertain x-ray source 4U 0138+48."
1983 January 24 (3765) Brian G. Marsden
Read IAUC 3766
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