Central Bureau for Astronomical Telegrams
IAUC 3003: N Vul 1976; gamma-RAY SOURCE NEAR 3U 0258+60; Cir X-1; 1976j; 1976a
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Read IAUC 3004
Circular No. 3003
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
NOVA VULPECULAE 1976
P. G. Martin and J. Maza, David Dunlap Observatory; and
J. R. P. Angel, Steward Observatory, report measurements of the
polarization of Nova Vul 1976 made during Oct. 25-27 with the
Steward Observatory's 229-cm reflector. From data at six wavelengths
in the range 3600-8500 A they find a characteristic interstellar
dependence described by p_max = 3.4 percent and lambda_max = 5900 A;
the p.a. 12o is typical for this region. Estimates E_(B-V) = 0.9 +/-
0.3 and m - M = 11 +/- 1 are derived from a comparison with tabulated
color excess and polarization data for neighboring stars, consistent
with the reddening-distance relation in that direction. Assumption
of mv = 6.5 near maximum leads to the corresponding Mv =
-7.5 +/- 1.5. Circular polarization in the red and blue is less than
0.08 percent (3-sigma level).
J. S. Neff, Department of Physics and Astronomy, University of
Iowa, reports that the peak flux of H-beta emission was comparable to
that of the adjacent continuum on Nov. 3.0 UT, the change since Nov.
1 (IAUC 3001) being mainly due to a significant increase in the
intensity of the continuum. Magnitude estimates by several members
of the American Association of Variable Star Observers indicate a
significant brightening to mv ~ 6.0-6.3 on Nov. 3.1 UT, followed by
a dramatic decline to mv ~ 7.8-8.0 on Nov. 4.1 and ~ 9 on Nov. 5.0.
gamma-RAY SOURCE NEAR 3U 0258+60
M. J. Coe, A. R. Engel and J. J. Quenby, Imperial College,
London, report: "We confirm the existence of a gamma-ray source in the
region of 3U 0258+60 (cf. IAUC 2992). Observations carried out
from Ariel 5 during 1975 July 9-13 show 2.3 x 10**-5 ph cm**-2 s**-1 keV**-1
in the range 300-1200 keV but a 2-sigma upper limit of 1.5 x 10**-4 in the
range 26-300 keV. 3U 0258+60 also lies in our 1-sigma error box."
CIRCINUS X-1
R. Dower, Massachusetts Institute of Technology, and the SAS-3
Group report that Cir X-1 was bright and active on Oct. 23 and 24
and began a transition to its low state on Oct. 24d20h34m UT. This
confirms the period and epoch given by Kaluzienski et al. (1976,
Astrophys. J. 208, L71; also IAUC 2939) and suggests that the x-ray
source is now in its extended 'on' state.
W. M. Goss and R. F. Haynes, C.S.I.R.O. Division of Radiophysics;
and A. Watkinson and D. Skellern, Electrical Engineering
Department, University of Sydney, report that the 1415-MHz flux
density of the presumably associated radio source (cf. IAUC 2977)
increased from 0.38 Jy on Sept. 5.3 UT to 1.1 Jy on Sept. 9.25.
These observations, as well as those at 5000 MHz in May, indicate a
delay in arrival times of the radio flares after the x-ray burst;
the delay increases with wavelength and is 2-3 days at 21 cm. The
position of the radio source is determined to be: R.A = 15h16m48s.6 +/-
0s.2, Decl. = -56o59'11" +/- 2" (equinox 1950.0). This is in excellent
agreement with the position of the optical candidate suggested on
IAUC 2957, now refined by A. J. Longmore and P. G. Murdin to R.A. =
15h16m48s.53 +/- 0s.12, Decl. = -56o59'11".8 +/- 1".0 (eguinox 1950.0).
PERIODIC COMET KLEMOLA (1976j)
The following precise positions have been reported:
1976 UT R. A. (1950) Decl. m1 Observer
Aug. 19.64688 23 00 44.15 + 4 55 08.0 13 Kojima
19.67813 23 00 44.48 + 4 54 50.9 "
21.70174 23 01 11.86 + 4 35 12.7 "
28.64391 23 02 18.13 + 3 17 53.0 Kurosaki
28.71510 23 02 18.09 + 3 17 02.6 "
31.61250 23 02 37.06 + 2 40 50.1 13.5 Seki
Sept.14.50741 23 03 40.25 - 0 28 54.8 13 Urata
14.51030 23 03 40.27 - 0 28 58.2 "
15.50000 23 03 45.75 - 0 42 43.9 13 "
15.50735 23 03 45.85 - 0 42 49.2 "
17.50000 23 03 58.31 - 1 10 23.1 13 "
17.50729 23 03 58.39 - 1 10 27.2 "
22.99322 23 04 45.43 - 2 23 45.6 14.5 Sykes
28.73787 23 06 01.88 - 3 34 43.3 12-13 Chernykh
29.81735 23 06 19.63 - 3 47 09.0 "
N. Kojima (Ishiki), T. Kurosaki (Utsunomiya) and T. Seki (Geisei).
From Orient. Astron. Assoc. Comet Bull. Nos. 135 and 136.
T. Urata (JCPM Yakiimo Station). From Nihondaira Obs. Circ. No. 794.
D. Sykes (Woolston Observatory). Measurer: R. L. Waterfield. Two
streamers 90" long in p.a. 210o and 250o border a fan tail.
N. S. Chernykh (Crimean Astrophysical Observatory). Measurer:
L. V. Zhuravleva. From Kiev Komet. Tsirk. No. 201.
COMET BRADFIELD (1976a)
The following precise position was obtained by R. E. McCrosky
at Harvard Observatory's Agassiz Station. Measurer: C. Y. Shao.
1976 UT R. A. (1950) Decl.
Mar. 29.15226 6 06 42.72 +31 22 00.6
1976 November 5 (3003) Brian G. Marsden
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