Central Bureau for Astronomical Telegrams
IAUC 2823: A0620-00
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Read IAUC 2824
Circular No. 2823
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
A0620-00
W. Liller, Center for Astrophysics, reports: "Lola J. Eachus
has discovered on Harvard plates that the star associated with
A0620-00 (see IAUC 2819) also erupted in 1917, reaching B = 12.0 or
slightly brighter in early November. The star is seen on five
blue-sensitive plates, and the shape of its light curve is well
enough determined to show that it is nova-like in appearance. The
star remained brighter than B = 13.0, the limiting magnitude of the
patrol plates, for 75 to 150 days. From our magnitude estimate for
this star on the blue Palomar Sky Survey print, B ~ 20, we deduce a
range of about 8 magnitudes, typical of recurrent novae with similar
time intervals between outbursts (57.8 years for A0620-00).
According to C. Payne-Gaposchkin (1962, 'The Galactic Novae', New
York: Dover), the absolute magnitude of recurrent novae at maximum
is M_B ~ -7.5, and if the interstellar absorption amounts to 1.0
mag/kpc, then the distance to A0620-00 is 5700 pc."
K. Locher, Grut-Wetzikon, Switzerland, sends the following
visual magnitude estimate: Aug. 21.14 UT, 10.4. There was probably
no fluctuation exceeding 0.2 magnitude within 30 min. Comparison
was made with the AAVSO sequence for V Mon.
F. Owen, National Radio Astronomy Observatory; T. Balonek,
University of Massachusetts; J. Dickey and Y. Terzian, Cornell
University; and S. Gottesman, University of Florida, report that
observations made with the N.R.A.O. 91-m telescope and the Green Bank
interferometer indicate that the flux of the radio source associated
with A0620-00 has decayed. Preliminary results are as follows:
1975 UT Frequency Flux density Telescope
Aug. 15.59 1400 MHz 0.30 +/- 0.08 Jy 91-m
16.59 2695 0.26 +/- 0.04 "
18.58 2695 0.14 +/- 0.03 "
18.6 1418 0.13 +/- 0.06 interferometer
20.57 2695 0.11 +/- 0.025 91-m
22.4 1420 0.05 +/- 0.01 interferometer
P. F. Scott, Mullard Radio Astronomy Observatory, reports that
the right ascension of the radio source is R.A. = 6h20m11s.256 +/- 0s.010
(equinox 1950.0). On Aug. 22 the flux density at 5000 MHz was 0.02
+/- 0.007 Jy.
1975 August 27 (2823) Brian G. Marsden
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