Central Bureau for Astronomical Telegrams
IAUC 2802: HDE 226868; ERUPTIVE Var IN Aql; omicron And
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Read IAUC 2803
Circular No. 2802
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
HDE 226868
G. Auriemma, D. Cardini, E. Costa, F. Giovannelli, M. Orciuolo
and M. Ranieri, Laboratory for Space Astrophysics, Frascati, report:
"Observations with 1-ms resolution carried out with the 91-cm
telescope at the Catania Astrophysical Observatory have revealed a
very strong pulsed emission with period 83.525 ms. This transient
event was observed on June 10.061 UT and disappeared 10 min later.
The amplitude of the variation was up to 5 percent of the total
emission with 10-sigma statistical significance. The repetition rate
showed a maximum deviation of 0.01 percent from the mean period.
Further observations are required to prove the plausible connection
of the strong pulsations with the recent transition to the high
state of the associated x-ray source Cyg X-1 (IAUC 2778)."
ERUPTIVE VARIABLE IN AQUILA
A. M. van Genderen and G. M. Uiterwaal, Leiden Observatory
Southern Station, write that this object (IAUC 2788, 2795) is probably
a fast nova. The following preliminary photoelectric observations,
obtained with the 90-cm light collector, show a linear decrease
in brightness, with small deviations of about 0.1 magnitude:
1975 UT V B - V 1975 UT V B - V 1975 UT V B - V
June 13 11.60 +0.79 June 17 11.93 +0.68 July 2 13.29 +0.60
14 11.68 +0.74 26 12.67 +0.58 5 13.50 +0.64
15 11.72 +0.74 28 12.98 +0.63 8 13.65 +0.60
16 11.86 +0.71 29 13.10 +0.66
G. M. Hurst, Northampton, England, sends the following magnitude
estimates, reduced by him in the case of the photovisual values:
June 14.03, mpv = 11.0 (R. E. Mewis); 17.98, mpv = 11.6
(Mewis); 18.05, mpv = 11.7 (W. E. Pennell); 21.01, mv = 11.9
(Hurst); 23.0, mv = 11.8 (I. D. Howarth); 29.96, mv = 13.3 (Hurst).
The visual observation on June 14.02 (IAUC 2795) is incorrect.
omicron ANDROMEDAE
P. Koubsky, Ondrejov Observatory, reports that a spectrogram
of omicron And obtained on July 13.986 UT by Kocourek and himself with
the coude spectrograph on the 200-cm reflector shows that the H-beta
line has a sharp shell component.
1975 July 18 (2802) Brian G. Marsden
Read IAUC 2803
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