Central Bureau for Astronomical Telegrams
IAUC 5317: 1991an; LSI +61 303; V919 Sgr
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Circular No. 5317
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
SUPERNOVA 1991an IN ANONYMOUS GALAXY
C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of an apparent supernova of mag about 20.3 on pan films taken
June 8.99 and 9.97 UT. The object is at R.A. = 17h39m18s.13, Decl.
= +67 43'59".5 (equinox 1950.0), situated in a galaxy of mag 19-20
whose center is located at R.A. = 17h39m18s.96, Decl. = +67 43'55".6.
SN 1991an appears visible at the limit of two films (mag about 22)
taken by D. Albanese on July 8.96 and 10.92 UT. Nothing is visible
on POSS prints. A nearby star (mag 17) is located at R.A. =
17h39m12s.06, Decl. = +67 44'13".1.
LSI +61 303
J. Marti and F. Comeron, University of Barcelona, communicate:
"We have detected an unexpected optical brightening of the x-ray
binary LSI +61 303 (R.A. = 2h36m41s, Decl. = +61 00'.9, equinox
1950.0). Observations were carried out with the 1-m Jacobus Kapteyn
Telescope at the Observatory of El Roque de los Muchachos using the
two-channel People's Photometer. Preliminary reductions give the
following Johnson V magnitudes: July 31.25 UT, 7.8; Aug. 1.15, 7.9;
2.20, 7.9. These values are about 3 mag brighter than usual."
V919 SAGITTARII
R. J. Ivison and M. K. Bang, Lancashire Polytechnic; F. Comeron
and J. Marti, University of Barcelona, report: "This Z And-type
classical symbiotic star appears to be in outburst. Observations
from the Roque de los Muchachos Observatory, La Palma, on July 31.1
and Aug. 2.2 UT, using the 2.5-m Isaac Newton (+ Manchester Echelle
Spectrometer/IPCS) and 1-m Jacobus Kapteyn (+ People's Photometer)
telescopes, reveal that the He II (468.6 nm) line has disappeared
and that [O III] (500.7 nm) is also absent. The He I (501.5 nm)
line shows a P-Cyg profile and the H-alpha (656.3 nm) recombination
line is strong, broad, and has a deep central reversal. Comparison
with photometric standards gives V = 11.1, B-V = +0.4, V-R = +0.8,
which suggests a 1.5-mag rise in V from quiescence and a color
change to spectral class F. V919 Sgr is located at R.A. =
19h00m51s.6, Decl. = -17 04'24" (equinox 1950.0). Infrared
observations with the U.K. Infrared Telescope and visual monitoring are
planned."
1991 August 3 (5317) Daniel W. E. Green
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