Central Bureau for Astronomical Telegrams
IAUC 3253: 1978 PA; OPTICAL COUNTERPART OF 4U 1837+04; HZ Her
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Circular No. 3253
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
1978 PA
H.-E. Schuster, European Southern Observatory, telexes that he
has discovered a fast-moving asteroidal object as follows:
1978 UT R. A. (1950) Decl. Mag.
Aug. 11.23958 0 06 45 -39 38.6 16
11.27917 0 06 46 -39 39.6
12.24861 0 07 14 -40 07.3 16
12.34306 0 07 17 -40 10.0
13.30417 0 07 42 -40 37.6 17
It is probable that this is an Amor-type object.
OPTICAL COUNTERPART OF 4U 1837+04
J. Thorstensen, P. Charles and S. Bowyer, Space Sciences
Laboratory, University of California at Berkeley, report: "The
Davidsen (IAUC 2824) candidate for 4U 1837+04, recently announced
by Margon et al. (IAUC 3246) to have an absorption spectrum and
possibly be variable, has been observed at the Lick Observatory.
U, B and R plates were taken in 1" seeing with the 91-cm Crossley
reflector. These plates resolve the Davidsen candidate into two
stars separated by 2".2 in p.a. 210o. The northern component (B ~
18.5) clearly dominates in the red, while the southern component
(B ~ 19.2) has an ultraviolet excess and is much the brighter of
the two in the ultraviolet. Subsequent spectrophotometry of both
stars with the 300-cm Shane telescope reveals late-type stellar
features in the northern component similar to those reported by Margon
et al., while the southern star has a nearly featureless continuum
with weak He II 4686 A emission. Thus Margon et al. probably
observed a blend of the two stars with the red component dominating.
We find no evidence for spectroscopic variability. Our observations
confirm the Davidsen result and identify the x-ray star."
HZ HERCULIS
D. Crampton and J. B. Hutchings, Dominion Astrophysical
Observatory, report: "A spectrum of HZ Her taken with the Kitt Peak
400-cm telescope on Aug. 10.17 UT (phase 0.35) shows abnormally strong
N III emission lines at 4634-4640 A. Optical and x-ray observations
are encouraged to look for unusual activity."
1978 August 14 (3253) Daniel W. E. Green
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