Central Bureau for Astronomical Telegrams
IAUC 5179: N Mus 1991; BARIUM AND LITHIUM CLOUD RELEASES; 1990aj
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Circular No. 5179
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
NOVA MUSCAE 1991
R. Sunyaev on behalf of the Granat team (Space Research Institute,
Moscow; Danish Space Research Institute, Lyngby) reports: "The
WATCH instrument detected a gradual increase of the 10- to 30-keV
flux of GRS 1124-684 (Nova Mus 1991) from 0.9 Crab on Jan. 8.5 UT up
to 2.0 Crab on Jan. 10.2. During Jan. 12-14 the average source flux
stabilized at 1.9 Crab. During observations between Jan. 16 and 21,
the source was found at a level of 0.5 Crab; thereafter, the source
flux increased to 1.3 Crab between Jan. 21 and 22 and kept this
level until observation on Jan. 25. Variations of intensity up to
about 2-3 times on a timescale of several hr were detected by both
the ART-P and WATCH instruments above 10 keV, while the soft component
below 10 keV was relatively less variable during ART-P
observations."
Corrigenda to IAUC 5176:
line 3, for Sigma (at 30 keV) and ART-P (30 keV) read SIGMA (at
energies > 30 keV) and ART-P (< 30 keV)
line 17, for on Jan. 9-10 at 30 keV read on Jan. 9-10 above 30 keV
BARIUM AND LITHIUM CLOUD RELEASES
R. J. Howard, National Aeronautics and Space Admininstration,
reports that six releases (cf. IAUC 5154, 5155) occurred during Jan.
13-20, which were not as bright at visual or photographic (blue)
wavelengths as anticipated (mv about +2 to -2). The Li I cloud, for
example, is quite bright to red-sensitive detectors (670.8 nm). One
more release each of barium and lithium (again observable from much
of the western hemisphere) will take place during the following
windows: Feb. 10.083-10.258, 12.134-12.308, 14.186-14.360, 17.125-
17.228, and 19.223-19.278 UT.
SUPERNOVA 1990aj IN NGC 1640
R. H. McNaught, University of Adelaide, reports the following
limiting magnitudes from R. Evans, Hazelbrook, N.S.W., in his visual
supernova searches of this galaxy during 1990: Jan. 22, [14; July
19, [14.5; [15 on Aug. 17, Sept. 22, Oct. 2, 10, 22, Nov. 9, 23,
and Dec. 11. M. Read, Royal Observatory, Edinburgh, reports that
this supernova does not appear to a limit of B about 19.5 on a pair
of plates taken by M. Hartley with the U.K. Schmidt Telescope on
1989 Oct. 28.
1991 February 4 (5179) Daniel W. E. Green
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