Central Bureau for Astronomical Telegrams
IAUC 2788: X-RAY INCREASE OF AQL X-1; OUTBURST OF CI Cyg; N OR OTHER ERUPTIVE Var; A0535+26
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Read IAUC 2789
Circular No. 2788
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
X-RAY INCREASE OF AQL X-1
J. Buff, Massachusetts Institute of Technology, reports that
their group has observed a dramatic increase in the intensity of
Aql X-1 (3U 1908+0) with the SAS-3 satellite. Between 1975 June 2
and June 7 the 1.5-keV intensity increased by a factor of 20 so
that it is now as bright as the Crab Nebula. The source is
presently observable in the energy range 0.5 to 20 keV. Limits on
periodic pulsing of 2% have been set on the range 1 to 50 seconds.
OUTBURST OF CI CYGNI
Janet A. Mattei, Director of the American Association of
Variable Star Observers, reports the outburst of the symbiotic
variable CI Cygni (cf. IAUC 2335, 2575) and communicates the following
visual magnitude estimates by AAVSO members:
1975 UT mv Observer
May 17.2 10.5 W. Lowder
18.1 10.1 J. Bauer
28.2 9.5 W. Lowder
29.3 9.3 E. Hayden
29.9 9.4 J. Bauer
NOVA OR OTHER ERUPTIVE VARIABLE
P. Wild, Astronomisches Institute der Universitat Bern, cables
the discovery of the following eruptive object:
1975 UT R. A. (1950) Decl. mpv
June 6.0868 19 15 26.9 +04 41 44.3 11.5
June 9 12
A0535+26
Corrigendum: On IAUC 2787, line 22, for fourth and fifth
harmonics read third and fourth harmonics.
1975 June 11 (2788) Owen Gingerich
Read IAUC 2789
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