Central Bureau for Astronomical Telegrams
IAUC 4825: V745 Sco; Occn OF 28 Sgr BY TITAN
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Read IAUC 4826
Circular No. 4825
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
V745 SCORPII
F. Makino, Institute of Space and Astronautical Science,
Sagamihara, informs us that the region around V745 Sco was
scanned with the all-sky x-ray monitor aboard Ginga on Aug. 2.90 UT.
The star was not resolved from the nearby x-ray source 4U 1755-338, and
no emission brighter than 4U 1755-338 was detected in the vicinity (to
an upper limit of 70 mCrab).
H. W. Duerbeck and H. E. Schwarz, European Southern Observatory,
report: "Spectroscopic observations of V745 Sco were obtained on Aug.
2.0-2.3 UT with the 1.4-m CAT/CES at a resolving power of 60 000. The
nebular [O III] 500.7-nm line (equivalent width 0.046 nm, radial
velocity -92 km/s, FWHM around 40 km/s) was detected, indicating the
presence of tenuous material near the nova. H alpha, He I 587.6 nm and
He II 468.6 nm show broad emission lines (around +170 km/s, FWHM around
1500 km/s) with superimposed narrow emission lines (-92 km/s, FWHM
around 45 km/s). He II also shows an absorption trough at the same
redshift as the narrow emission lines. Interstellar Na I is strong
(total equivalent width 0.3 nm) and shows about 15 components ranging
from -175 to +32 km/s."
OCCULTATION OF 28 SAGITTARII BY TITAN
K. Zdanavicius and K. Cernis, Institute of Physics, Vilnius,
report: "We observed the July 3 occultation with a one-channel
photometer (in V) on the 1-m reflector at Majdanak Observatory
(Long. = +4h27m.5, Lat. = +38d42', h = 2540 m). Measurements were
made in 1-s exposures every 3 s. Before and after the occultation
the standard deviation of one observation was 0.026 mag. The
occultation lasted from 22h35m39s to 22h40m03s (+/- 1s) UT. The
lightcurve contains about 16 depressions that were probably caused
by atmospheric clouds; the amplitude of the fluctuations was up to
0.7 mag. The combined brightness of 28 Sgr and Titan decreased by
2.86 mag, minimum light being observed 18 s before the center of
symmetry of the lightcurve. Complete obscuration probably did not
take place."
M. Nezel, Bremen, West Germany, writes that the event was
recorded photoelectrically (0.30-m f/6 reflector, V band, 65"
aperture) at the Langwedel Observatory (Long. = +9d11'02", Lat. =
+52d58'37", h = 20 m). M. Bruns and H. Struckmann assisted. In
the notation of IAUC 4801, t1 = 38m37s, t2 = 39m57s, t3 = 43m07s,
t4 = 44m17s. The central flash, peaking at 11 percent of the star's
intensity, lasted from 41m25s to 41s29s.
1989 August 3 (4825) Brian G. Marsden
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