Central Bureau for Astronomical Telegrams
IAUC 3703: TWIN WHITE DWARFS; RADIO PULSAR IN THE LMC; GX 301-2 = 4U 1223-62; AM Her
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Circular No. 3703
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
TWIN WHITE DWARFS
N. Sanduleak and P. Pesch, Warner and Swasey Observatory, report
the discovery on a low-dispersion objective-prism plate of an
astrophysically important binary system containing nearly identical
probably DA white dwarfs. Both components have B ~ 15.5 and show
very broad hydrogen lines and moderately strong ultraviolet continua.
They are located at R. A. 17h04m.1 Decl. +48o07'(equinox 1950.0), and
the separation observed on the plate taken in 1982 May is ~ 6"
essentially east-west. Orbital motion appears to be present when a
comparison is made with the Palomar Sky Survey prints (obtained in
1955), where the orientation is more nearly southeast-northwest.
The absence of the pair in published lists of high-proper-motion
stars suggests that u < 0".2/yr. The stars can be readily identified
on the Sky Survey prints, where they lie 6.0 mm east-southeast
of the star SAO 46477.
RADIO PULSAR IN THE LARGE MAGELLANIC CLOUD
P. M. McCulloch and P. A. Hamilton, University of Tasmania;
and J. G. Ables and A. J. Hunt, C.S.I.R.O. Division of Radiophysics,
report the discovery of a pulsar at R. A. 5h29m.5, Decl. -66o57' +/-
8' (equinox 1950.0). The pulsar was found on 1981 May 8 and confirmed
on 1982 Feb. 6. Observations at 680 MHz give the barycentric period
as 0s.9975717 +/- 0s.0000002, dispersion measure 110 +/- 10
cm**-3 pc, pulse duty cycle 4 percent and mean flux 1.4 mJy. The
unusually high dispersion at this galactic latitude (-32o) suggests
that the pulsar is extragalactic, probably in the LMC.
GX 301-2 = 4U 1223-62
M. Oda and the Hakucho Team telex that Hakucho observed this
object during Apr. 6-21 and May 16-21. Flare centers occurred on
Apr. 7 and May 19. Preliminary analysis gives the pulse period as
698s, with error and/or variation 0.5s. The value given on IAUC
3688 is incorrect.
AM HERCULIS
Further visual magnitude estimates (cf. IAUC 3689, 3693) by M.
Verdenet, Bourbor-Lancy, France: May 10.8 UT, 13.7; 11.8, 13.6;
12.8, 13.2; 13.8, 12.9; 14.8, 13.0.
1982 June 15 (3703) Brian G. Marsden
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