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IAUC 6051: X-RAY N IN Sco; NEW Var STAR IN Sgr

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                                                  Circular No. 6051
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


X-RAY NOVA IN SCORPIUS
     R. A. Kroeger, J. E. Grove, J. D. Kurfess, W. N. Johnson, and
M. S. Strickman, Naval Research Laboratory, write: "We have further
constrained the position determined by BATSE for GRO J1655-40 (IAUC
6046) using the OSSE instrument on the Compton Gamma Ray
Observatory.  Data from a 1-dimensional scan through the source
region constrain the position to be within 0.11 deg (90-percent
confidence) of the great circle connecting the following points:
R.A. = 16h53m, Decl. = -39o43' (equinox 2000.0); R.A. = 16h59m,
Decl. = -41o21'.  Our limit overlaps with about 30 percent of the
original BATSE error circle and is not consistent with the x-ray
source 1ES 1649-403 (cf. IAUC 6048).  The gamma-ray spectrum is
well-represented by a power-law model that continues to harden with
time, with the following spectral indicies:  Aug. 4, -2.7; 9, -2.4.
BATSE's reported spectral index on Aug. 1 was -3.15.  Significant
source flux is observed to 600 keV."


NEW VARIABLE STAR IN SAGITTARIUS
     H. Sato, National Astronomical Observatory of Japan, has
reported the discovery of what was termed a possible nova by Yukio
Sakurai (Mito, Japan) on Fuji SG400 film at the following position:
R.A. = 17h56m35s.54, Decl. = -25o13'15".7 (equinox 1950.0); giving
the following magnitude estimates:  May 20 UT, [12.5; June 17,
[11.5; July 3, [11:; 28.520, 11.4; Aug. 8.548, 11.4.  Further
observations suggest that the object is evidently a Mira-type or
symbiotic star undergoing an outburst:  T. Beers (Michigan State
University), W. Brandner and T. Lehmann (European Southern
Observatory = ESO), and H. W. Duerbeck (Astronomical Institute
Munster) report that a spectrogram (range 360-495 nm), taken on Aug.
10.084 with the ESO 1.52-m telescope, shows strong, narrow (FWHM
</= 120 km/s) emission lines of H-beta to H10 (with H-epsilon weak
or absent), superimposed on a red continuum with traces of TiO
bands at 458.4, 462.6, 476.1, and 480.4 nm.  Photometry on Aug.
10.161 yields V = 12.41 +/- 0.02, B-V = +2.52 +/- 0.04, V-R = +1.56
+/- 0.02.  M. Della Valle (Universita di Padova) and A. Smette
(Groningen) report that spectrograms (range 400-750 nm, resolution
0.8 nm) obtained on Aug. 10.0 at the La Silla 3.6-m telescope (+
EFOSC) reveal an Me spectrum, characterized by TiO absorption bands
furrowed by narrow Balmer emission lines; inspection of photographic
surveys yields the following magnitudes:  1950 July, B about 19
(Palomar); 1976 May, B = 14-15 (ESO); 1977 June, R about 12 (Palomar).


1994 August 11                 (6051)            Daniel W. E. Green

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