Central Bureau for Astronomical Telegrams
IAUC 3261: PKS 0548-322; V861 Sco; BRIGHT ULTRAVIOLET SOURCE; HS Sge
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Read IAUC 3262
Circular No. 3261
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
PKS 0548-322
G. R. Riegler, P. C. Agrawal and M. J. Rosker, Jet Propulsion
Laboratory, report the detection of low-energy x-radiation from the
vicinity of PKS 0548-322 with the HEAO-A2 energy detectors. During
observations around 1977 Sept. 19 and 1978 Mar. 17 the ecliptic
latitude of the observed source was 2-sigma away from the ecliptic
latitude of the center of 4U 0543-31 and was consistent with that of
the BL-Lac candidate PKS 0548-322 (suggested by R. Mushotsky, Goddard
Space Flight Center). Assuming a thermal spectrum of temperature
4 x 10**6 K and column density 4 x 10**20 H cm**-2, a flux of 4 x
10**-11 erg cm**-2 s**-1 was observed at 0.15-3 keV, including a flux of
1 x 10**-11 erg cm**-2 s**-1 at 0.15-0.4 keV.
V861 SCORPII
R. F. Jameson and M. R. Sherrington, Astronomy Department,
Leicester University; and A. J. Longmore, Royal Observatory, Edinburgh,
report observations of V861 Sco at 1.2 and 2.2 um during July
25-Aug. 17. The deeper eclipse (depths 0.24 in J, 0.29 in K) appears
to correspond with x-ray eclipse. The other eclipse (assumed
to be primary) has depths 0.08 in J and 0.09 in K. An epoch for
primary minimum is 1978 Aug. 3.34 +/- 0.08 UT.
BRIGHT ULTRAVIOLET SOURCE
R. Sagdeev, Space Research Institute, U.S.S.R. Academy of
Sciences, communicates that in 1977 Oct. a joint Soviet-French team
headed by V. Kurt and J. Bertaux discovered a bright ultraviolet
source in the range 600 A. Observations conducted on the Prognoz 6
satellite showed the flux to be 6 x 10**-11 erg cm**-2 s**-1. The object
proposed for identification is the hot white dwarf Feige 4, with a
temperature of 10**5 K. Its coordinates are R.A. = 0h17m.4, Decl. = +13o36'
(equinox 1950.0), and its photographic magnitude is 14.
HS SAGITTAE
It has been suggested that the observations reported on IAUC
3258 refer to the wrong star. Further visual magnitude estimates
follow: Aug. 5.1 UT, 13.9 (J. Bortle, Brooks Observatory); 11.08,
14.3 (Bortle); 22.20, 14.5 (S. O'Meara, Harvard College Observatory);
Sept. 2.07, 14.2 (Bortle); 3.12, 14.5 (O'Meara).
1978 September 8 (3261) Brian G. Marsden
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