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IAUC 3614: SNe; PU Vul; BH CVn

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IAUC number

                                                  Circular No. 3614
Central Bureau for Astronomical Telegrams
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

     J. Maza and C. Torres, Department of Astronomy, University of
Chile, telex that L. E. Gonzalez has discovered a possible supernova
located 1" east and 8" north of the center of an anonymous galaxy
at R.A. = 20h16m14s.2, Decl. = -23o49'07" (equinox 1950.0); on June
4.261 UT the object was at mpg = 18.5.  They also report that the
Gonzalez supernova (IAUC 3610) is not in an anonymous galaxy, but
in NGC 4716, and that the discovery was actually made by M.
Wischnejewsky on a plate taken by L. E. Gonzalez; this object was
observed on June 5.060, with mpg remaining ~ 15.  They also observed
the supernova in NGC 5597 on June 4.163 at mpg ~ 17.3.

     S. W. Mochnacki and H. C. Harris, Dominion Astrophysical
Observatory, communicate: "A blue image-tube plate (dispersion 3.8 x
10-6), taken with the 1.8-m telescope on June 6.38 UT, shows a normal
spectrum classified as F6 Ib-II, the only abnormality being
filling-in of H-beta and possibly H-gamma by emission.  The radial velocity
from 18 lines was 18 +/- 6 km/s, the standard deviation of 24 km/s being
more than twice as large as for normal F supergiants.  A simultaneous
radial-velocity-scanner measurement was obtained with the
assistance of M. Lanning using the 1.2-m telescope.  The velocity
was 27.5 +/- 2 km/s using a K-star mask.  Spectrophotometric scans by
Mochnacki, J. B. Oke and T. B. Ake, III, taken at Palomar Observatory
during the previous outburst and minimum, show a probably composite
spectrum with an underlying M supergiant."

     M. S. Barbour and J. C. Kemp, Physics Department, University
of Oregon, write: "We recorded a flare-like optical event from the
RS CVn-type binary BH CVn (= HR 5110) during June 15.229-15.313 UT.
V-band photometry on the 0.81-m telescope at Pine Mountain Observatory
showed a brightening by 0.027 mag, more than twice the peak-to-peak
amplitude of the orbital light curve.  Simultaneous U-band linear
polarimetry on our 0.61-m telescope showed a monotonic decrease
in polarization from 0.10 to 0.01 percent.  The significances of
these changes each exceeded 3 sigma.  Among data from many nights of
polarimetry and 10 nights of good simultaneous photometry, this was
our best case for rapid variability.  Correlative work is invited."

1981 June 26                   (3614)              Daniel W. E. Green

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