Central Bureau for Astronomical Telegrams
IAUC 3298: OPTICAL COUNTERPART OF 2A 0526-328; V1341 Cyg; iota Lyr; NGC 1851
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Read IAUC 3299
Circular No. 3298
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
OPTICAL COUNTERPART OF 2A 0526-328
P. A. Charles, J. R. Thorstensen and S. Bowyer, Space Sciences
Laboratory, University of California at Berkeley, report the discovery
of a magnitude ~ 14 blue star that they identify as the optical
counterpart of 2A 0526-328. The star, which is located at R.A. =
5h27m36s.5, Decl. = -32o51'30" (equinox 1950.0, uncertainty +/- 15"), is
the south following of a close pair. It is just north of the southeast
HEAO-A3 error box for the x-ray source. Spectroscopic observations
obtained with the Lick Observatory's 305-cm Shane telescope
reveal its strong Balmer, He I and He II emission lines superposed
on a blue continuum with no apparent emission features. The equivalent
width of H-alpha (the strongest feature) is ~ 23 A. The similarity
of this spectrum to those of cataclysmic variables and AM Her suggests
that the star be examined for variability.
V1341 CYGNI
D. Crampton and A. Cowley, University of Michigan, write:
"From UBV photometry (Basko et al. 1976, Peremennye Zvezdy 20, 220;
Lyutyj and Syunyaev 1976, Astron. Zh. 53, 511) we find ellipsoidal
variations (Delta-V ~ 0.2 magnitude) confirming the 9.8-day period for
V1341 Cyg = Cyg X-2 (cf. IAUC 3292). In addition, using only the
data prior to 1975 Apr., when Cyg X-2 was in its x-ray high state,
the U light curve showed only a single maximum, consistent in phase
with x-ray heating of the optical star. Further photometric and x-ray
observations should be made."
iota LYRAE
G. Guerrero, L. Mantegazza and M. Scardia, Osservatorio Astronomico
di Brera, write: "In 1975 the Be star iota Lyr was showing H-alpha
in emission (Doazan et al. 1977, Astron. Astrophys 56, 481). On
two spectrograms (dispersion 35 A/mm) taken on 1978 Sept. 11 and 12
with the Merate Observatory's 137-cm telescope there is no trace of
that emission.
NGC 1851
E. Bajaja and M. E. Arnal, Instituto Argentino de Radioastronomia,
write that new 21-cm observations show no H I above 0.48 +/- 3
K. The earlier announcement (IAUC 3209) should thus be disregarded.
1978 November 3 (3298) Brian G. Marsden
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