Central Bureau for Astronomical Telegrams
IAUC 3427: V711 Tau; Sco X-1; Cir X-1; 2A 0526-328
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Read IAUC 3428
Circular No. 3427
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
V711 TAURI
D. S. Hall, Chairman of IAU Commission 42's Working Group on
RS CVn Binaries, telexes that D. C. Barry, University of Southern
California, has asked him to announce the recent decision to have
Voyager I observe V711 Tau = HR 1099 between Dec. 14d22h UT and
Dec. 17d16h UT. Observations of all types made before, during and
afterwards will be extremely valuable, especially any spectroscopic,
radio and far-ultraviolet indications of flaring.
SCORPIUS X-1
B. A. Cooke, Leicester University, announces that the worldwide
x-ray/optical study of Sco X-1 (cf. IAUC 3404) will now take
place during 1980 Apr. 8-17. This change is caused by unforeseen
operation constraints on the Ariel-6 spacecraft.
CIRCINUS X-1
M. Watson and C. Page announce that Ariel 6 will observe Cir
X-1 during 1980 May 8-17, spanning the predicted time of x-ray
transition. Spectroscopic and infrared observations are also
planned. Anyone else interested in monitoring Cir X-1 during this
period is invited to contact them at the address: Physics Department,
Leicester University, Leicester LEl 7RH, England (telephone
U.K. 0533-554455, ext. 23; telex 341664 LUXRAY G).
2A 0526-328
C. Motch, European Southern Observatory, reports that nine
nights of optical photometry of the star associated with 2A 0526-328
(cf. IAUC 3298) at the 1-m telescope reveal a smooth modulation
with a period of 5.186 +/- 0.009 hours and a full amplitude of
0.27 mag in B (although the alias period of 4.26 +/- 0.01 hours
cannot be ruled out). Minimum occurred on 1979 Nov. 28.222 UT. There
is also some erratic activity, with amplitude 0.1 mag in B on
timescales of 1-30 min, and a variation of 0.3 mag in the average level
of B on a timescale of 2 days. The B magnitude ranges from 13.6 to
14.2. Average colors are B-V = +0.08 and U-B = -0.91.
1979 December 4 (3427) Brian G. Marsden
Read IAUC 3428
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