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IAUC 3502: VY Scl; Cyg X-1; Poss. RADIO Id OF TYCHO'S SN; OH 205.1-14.1

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IAUC number 

                                                  Circular No. 3502
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


VY SCULPTORIS
     B. Warner, University of Cape Town, telexes: "B. J. M. Hassall
and J. H. J. Whelan, Institute of Astronomy, Cambridge, report from
observations made with the 1.9-m and 1.0-m telescopes at the South
African Astronomical Observatory that the novalike variable VY Scl
(R.A. = 23h23m.7, Decl. = -30o20', equinox 1900.0) is currently in one of
its rare faint states (V ~ 17).  The current spectrum is very
similar to that of a dwarf nova at quiescence.  This is in accordance
with the idea that VY Scl is usually in an eruptive bright state
(e.g., Warner and van Citters 1974, Obs. 94, 116).  Further
observations at a wide range of wavelengths are encouraged."


CYGNUS X-1
     M. Oda and the Hakucho Team, University of Tokyo, report:
"Cyg X-1 had been in its high state (cf. IAUC 3491) until around
June 30.  It then declined monotonically, was in its low state on
July 10 and remained so until July 28.  Our monitoring of the
source will be continued until the end of August."


POSSIBLE RADIO IDENTIFICATION OF TYCHO'S SUPERNOVA
     S. F. Gull and G. G. Pooley, Mullard Radio Astronomy Observatory,
University of Cambridge, communicate: "We have detected a
small-diameter radio source close to the center of SNR 1572.  The
position is R.A. = 0h22m31s.25 +/- 0s.05, Decl. = +63o52'16".4 +/- 0".4 (equinox
1950.0).  The flux at 2.7 GHz is 4 +/- 0.5 mJy at 1980.55, and the
angular size is less than 3".  The probability of finding one
source brighter than 4 mJy within the boundary of the remnant
(radius 4') is 0.2.  The source is less than 40" from the center of
the remnant.  There is no apparent optical identification."


OH 205.1-14.1
     I. Kazes, D. Cesarsky, F. Biraud and J.-P. Drouhin report a
new flare of the unusual OH maser OH 205.1-14.1 (Pankonin et al.
1977, A. & Ap. 58, L25).  With the Nancay radio telescope they
observed the left circular polarization of the 1667-MHz radiation
during July 25-Aug. 1.  The l.s.r. velocity was 13.91 +/- 0.04 km/s
and the line width 0.13 +/- 0.04 km/s.  The flux density was ~ 6 Jy.
The velocity resolution of the autocorrelator was 0.038 km/s.


1980 August 18                 (3502)              Brian G. Marsden

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