Central Bureau for Astronomical Telegrams
IAUC 3838: SN IN NGC 5236; R Leo AND S140-IR; 1983i
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Circular No. 3838
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
SUPERNOVA IN NGC 5236
W. Wamsteker, European Space Agency, reports that IUE
observations at Vilspa suggest that this is a Type I supernova.
Monitoring for 4 hr on July 4 and for 8 hr on July 5 indicates
significant changes in the range 260-300 nm, with short-term variation
over 1-2 hr in the spectral features. The fine-error-sensor
magnitude (520 nm) was 12.8 on July 4 and 12.4 on July 5.
R LEONIS AND S140-IR
A.-M. Le Squeren, Observatoire de Meudon, communicates:
"R Leo had an unusual intensity variation during 1.8-m OH monitoring
of 15 Mira-type variables with the Nancay radio telescope
during 1980-1983. Like other Mira variables, it showed a phase
lag of a few days between the intensity of OH and the lightcurve.
However, the integrated OH flux of R Leo has steadily decreased
from 1.5 x 10**-22 W m**-2 (1667 MHz) at the maximum of the 1980
cycle to 0.1 x 10**-22 W m**-2 at the maximum of the 1982 cycle.
Observations in the infrared and other maser lines would help
attempts to explain this phenomenon."
L.-A. Nyman and G. Sandell, Onsala Space Observatory,
report: "The 22-GHz HWO maser associated with the protostellar
cluster S140-IR (Blair et al. 1978, Ap.J. 219, 896; Beichman et
al. 1979, Ap.J. 232, L47) has recently had a major flare. In June
we recorded an intensity of 2500 Jy at a velocity of -2.8 km/s
(VLSR) with the 20-m telescope, compared to an intensity of 175 Jy
in 1982 Dec. During the last year the maser has been in a quiescent
phase with 2-4 lines of ~ 30 to 100 Jy, although it was much
brighter (~ 500 Jy) from early 1981 until mid-1982."
PERIODIC COMET RUSSELL 3 (1983i)
Further precise positions have been reported as follows:
1983 UT R.A. (1950.0) Decl. m1 Observer
July 4.47155 20 27 28.20 - 2 13 22.7 16 Gilmore
4.58243 20 27 23.80 - 2 13 03.4 "
4.60946 20 27 22.92 - 2 12 54.3 Russell
A. C. Gilmore and P. M. Kilmartin (Mount John University
Observatory). 0.25-m f/7 astrograph. First image badly trailed.
K. S. Russell (U.K. Schmidt Telescope Unit, Siding Spring).
1983 July 7 (3838) Brian G. Marsden
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