Central Bureau for Astronomical Telegrams
IAUC 2701: U Cep; JUPITER I; (617) 864-5758
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Read IAUC 2702
Circular No. 2701
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
Western Union: RAPID SATELLITE CAMBMASS
U CEPHEI
A. H. Batten, Dominion Astrophysical Observatory; and B. W.
Baldwin and C. D. Scarfe, University of Victoria, report: "Balmer
emission has been observed in the spectrum of the eclipsing binary
U Cep during the total phases of the eclipses of Sept. 7, 12 and
17. This emission is stronger than that previously reported
(Batten 1969, Publ. Astron. Soc. Pacific 81, 904). The light curve
was also unusual on Sept. 12, resembling that of a partially-eclipsing
system. At minimum light the ultraviolet excess was unusually
large. A spectrogram of H-alpha obtained on Sept. 16 showed
emission visible even out of eclipse. There was also a second absorption
component of all the lines H-alpha, H-beta, H-gamma and H-delta, with
displacement corresponding to a velocity of approach of about 400
km/s. Continued observations by all means possible should be worth
while."
JUPITER I
P. Wehinger and S. Wyckoff, Wise Observatory, write: "Image-tube
spectrograms (150 A/mm dispersion, 3.5 A resolution, 5000-9000 A
spectral region) were obtained of the orbital plane of Jupiter
I (Io) on Aug. 11-13 and 25-27. Spectra obtained with the slit
oriented at a variety of positions both parallel and perpendicular
to Io's orbital plane indicate the presence of a highly flattened
Na emission disk centered at Jupiter with a radius of approximately
24 Rjup. On Aug. 27.9 UT the thickness of the disk was ~ 2 Rjup at 9
Rjup east of Jupiter. On Aug. 29.0, with Io near western quadrature,
the Na emission observed was some three times the intensity of the
Na emission at the corresponding point on the opposite side of
Jupiter. Over the six nights of observation, only the Na D lines
were observed in emission; their intensity appeared to be variable,
while the D1/D2 ratio remained constant."
(617) 864-5758
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1974 September 20 (2701) Brian G. Marsden
Read IAUC 2702
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