Dátum: 1999. május 22., 22:46
Feladó: Kiss László --
Tárgy: Nova Vel'99
Nos, vegre megjelent az IAU Circularban is a hir.
L. alabb:
NOVA VELORUM 1999
Independent visual discoveries of a bright nova have been made
by Peter Williams, Heathcote, New South Wales (via S. Lee and A.
Pearce), at m_v = 3.1 on May 22.396 UT and by Alan C. Gilmore,
Mount John University Observatory, on May 22.451. Lee provides the
following position from Anglo-Australian Telescope (AAT) encoders:
R.A. = 10h44m49s.5, Decl. = -52o25'35" (equinox 2000.0). Lee
reports that a low-dispersion spectrogram taken by Lewis, Colless,
Cannon, Bridges, and himself with the AAT (+ fiber spectrograph on
2dF; 1-s exposure, mirror stopped down to 2.5 m) shows H-alpha and
H-beta in narrow emission with a strong P-Cyg profile. An echelle
spectrogram (10-min exposure centered on May 22.500) of the
apparent nova by K. R. Pollard and J. A. McSaveney with the Mt.
John 1-m telescope shows H-alpha with blueshifted absorption and
slightly redshifted emission. Gilmore provides the following
photometry obtained with the Mount John 0.6-m reflector (comparison
star HR 4167 = p Vel, with assumed V = 3.84, U-B = +0.07, B-V =
+0.30, V-R = +0.20, V-I = +0.30): May 22.488, V = 2.88, U-B =
-0.27, B-V = +0.24, V-R = +0.16, V-I = +0.28; 22.574, 2.85, -0.27,
+0.28, +0.19, +0.27; 22.599, 2.84, -0.25, +0.29, +0.23, +0.33;
22.635, 2.80, -0.26, +0.31, +0.23, +0.33. P. M. Kilmartin reports
that a 1-s CCD (over)exposure on May 22.50 with the 0.6-m Boller &
Chivens Cassegrain reflector at Mount John yields the following
position end figures: 48s.1, 32" (four stars, mean residual 2".68
in R.A., 0".43 in Decl.). Pearce provides the following visual
magnitude estimates: May 22.42-22.52, 3.0; 22.54-22.58, 2.9.
Pearce notes that there appears to be nothing obvious on the
Digital Sky Survey image at the nova's position. P. Caldwell,
Geelong, Victoria, reports m_v about 2.8 (close to or slightly
fainter than the brightness of mu Vel) during May 22.50-22.53.
Kiss Laszlo