Central Bureau for Astronomical Telegrams
IAUC 3144: X-RAY FLARE; 2S 0114+650; Occns BY (15)
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Circular No. 3144
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK Telex: 921428
Telephone: (617) 864-5758
X-RAY FLARE
L. J. Kaluzienski and S. S. Holt, Goddard Space Flight Center,
report the detection with the Ariel 5 all-sky monitor of a flare
from the region containing the bright, variable source 4U 1642-45
and the recurrent transient 4U 1630-47. The net flux (3-6 keV, ~
half-day averages, units of the Crab Nebula) was measured at 0.85 +/-
0.1, 1.0 +/- 0.1 and 1.4 +/- 0.15 on Nov. 15, 17 and 21, respectively.
For comparison, an average flux of ~ 0.6 +/- 0.1 was measured in
separate (fine-mode) observations during Nov. 8-13. While an increase
from 4U 1642-45 cannot be ruled out, the flare may represent a late
appearance (by ~ 70 days) of the 'absent' turn-on in the proposed
615-day flare cycle of 4U 1630-47 (cf. IAUC 3104). The region also
contains the much weaker variable source 4U 1624-49.
2S 0114+650
R. Dower and R. Kelley, Massachusetts Institute of Technology,
report the detection in the SAS-3 galactic-survey data of a previously
unreported x-ray source at R.A. = 1h14m44s.3, Decl. = +65o01'34"
(equinox 1950.0, 90-percent-confidence error radius 30"). The
intensity (2-11 keV) during 1976 Jan. 1-3 was 0.004 times the Crab.
The source is distinct from 4U 0115+63, which lies 1o.5 to the south.
B. Margon, University of California at Los Angeles; and H.
Bradt, Massachusetts Institute of Technology, suggest the identification
of the above source 2S 0114+650 with a V ~ 11 reddened early-type
star 16" from the center of the x-ray error circle at R.A. =
1h14m41s.8, Decl. = +65o01'32" (equinox 1950.0). Spectrophotometry
obtained with the Lick Observatory's 305-cm reflector shows broad H-alpha
emission, He I absorption and strong interstellar lines.
OCCULTATIONS BY (15) EUNOMIA ON 1978 JANUARY 10 AND 19
D. Wallentinsen, Albuquerque, New Mexico, writes that (15)
Eunomia will occult SAO 97745 (mv = 8.7) on 1978 Jan. 10d21h.3 UT
across Indonesia, the Indian Ocean and Central Africa; and SAO
97645 = zeta1 Cnc AB (mv = 5.6, 6.3) on Jan. 19d01h.3 UT across northern
Russia, the Barents Sea, Greenland and northern Canada. The
track error is estimated as 1000 km, and the maximum occultation
duration will be 0.4 min. The former event was independently predicted
by P. Wils, Niel, Belgium; the latter by J. Meeus, Erps-Kwerps,
Belgium, and G. E. Taylor, H.M. Nautical Almanac Office.
1977 November 28 (3144) Brian G. Marsden
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