Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5517: 1992W, 1992X, 1992Y; HV Vir

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 5516  SEARCH Read IAUC 5518
IAUC number

                                                  Circular No. 5517
Central Bureau for Astronomical Telegrams
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

SUPERNOVAE 1992W, 1992X, 1992Y
     Jean Mueller reports her discovery of three supernovae on
plates taken with the 1.2-m Oschin Telescope in the course of the
second Palomar Sky Survey.  SN 1992W was at mag about 18 on a red
plate taken by J. D. Mendenhall and Mueller on Apr. 28; the
supernova is located 24" west and 32" north of the center of MCG
+08-23-096 (R.A. = 12h48m.0, Decl. = +48 22', equinox 1950.0).  SN
1992X was also at mag about 18 on a red plate taken by C. Brewer
and Mendenhall on May 2; the supernova is located 2" west and 7"
south of the center of MCG +06-32-024 (R.A. = 14h22m09s, Decl. =
+35 22'.0).  W. Sargent and T. Small confirmed SNe 1992W and 1992X
with spectrograms obtained May 9 at the Hale 5-m telescope (+ double
spectrograph).  SN 1992Y in NGC 3527 (R.A. = 11h04m.5, Decl. =
+28 48') was at mag 18.5-19 on a blue plate taken May 2 by Brewer
and Mendenhall.  SN 1992Y is located 13" east and 6" south of the
galaxy's nucleus; no image is present at this location on prints
from the original Palomar Sky Survey.

     K. H. Mantel, H. Barwig, and M. Patschke, Universitats-
Sternwarte Munchen; H. Ritter, Max-Planck-Institut fur Astrophysik,
Garching, report:  "Simultaneous high-speed UBVRI photometry was
performed during the new outburst of HV Vir (IAUC 5502, 5505) using
our fiberlink multicolor photometer (MCCP) at the 0.8-m telescope
on Mt. Wendelstein.  On Apr. 24 and 26, two measuring sequences of
5.4 hr each were obtained with a time resolution of 2 s.  Between
the first and second observations, the V brightness of HV Vir
decreased by 0.3 mag.  On both nights, the light curves showed periodic
light variations with a maximum amplitude of 0.06 mag in B.  A
periodic analysis revealed two periods at 80.6 and 83.3 min, which
give rise to a beat phenomenon in the hump structure of the light
curves.  The periods differ by 3.4 percent, which is typical for
dwarf novae in superoutburst.  This makes HV Vir a new member of
the SU UMa subclass of dwarf novae.  Its probable orbital period of
80.6 +/- 0.1 min and the recurrence time of about 60 years between
subsequent superoutbursts resemble the behaviour of WZ Sge."
     Corrigendum.  On IAUC 5503, line 12, for  range 760-720 nm,
read  range 460-720 nm,

1992 May 9                     (5517)            Daniel W. E. Green

Read IAUC 5516  SEARCH Read IAUC 5518

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!