[vsnet-j 1420] WZ Sge sequence

[Taichi Kato <tkato>]

From owner-vsnet-sequence@kusastro.kyoto-u.ac.jp Tue Jul 24 07:20 JST 2001
Date: Tue, 24 Jul 2001 00:14:20 +0200
From: "Bjorn H. Granslo" <b.h.granslo@astro.uio.no>
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Subject: [vsnet-sequence 88] Sequence of WZ Sagittae
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Norwegian Astronomical Society - Variable Star Section

Sequence of 2003+17  WZ Sagittae  [Version 2001 July 23]

Position: R.A. = 20h07m36s.4, Decl. = +17o42'15" (2000.0)
Magnitude: 8.0 - 15.5 v       Type: UGSU

This cataclysmic variable erupted in a very rare outburst on
2001 July 23 UT. The eruption was discovered by M. Oshima
[vsnet-alert 6093].  Previous outbursts occured in 1913, 1946,
and 1978.

I have prepared a list of bright comparison stars for this
object. Photometry (V and B-V) are from the Hipparcos catalogue
(stars 1-3) and Tycho-2 catalogue (others). Only stars with
B-V = +1.10 or less are included.

-------------------------------------------------------------
 Id.   R.A. (2000.0) Decl.    V-mag    B-V    Star Name
       h  m   s     o  '  "
-------------------------------------------------------------
 1    20 04 14.1  +17 44 05    6.87   +0.51   HIP 98835
 2    20 07 28.9  +17 01 14    7.62   +0.76   HIP 99128
 3    20 05 06.2  +17 52 43    7.93   +0.18   HIP 98912
 4    20 04 43.5  +17 55 46    8.09   +0.38   TYC 1621-1084
 5    20 09 34.3  +18 08 19    8.40   +0.31   TYC 1622-0192
 6    20 07 33.7  +17 40 00    8.74   +0.16   TYC 1621-1830
 7    20 06 59.4  +17 55 34    8.98   +0.51   TYC 1621-1106
 8    20 06 51.8  +17 54 37    9.32   +0.31   TYC 1621-1757
 9    20 08 01.4  +17 40 12    9.67   +1.09   TYC 1622-0989
 10   20 07 01.6  +17 36 22    9.88   +0.51   TYC 1621-1781
 11   20 07 19.7  +17 18 06   10.21   +1.07   TYC 1621-0193
 12   20 08 00.9  +17 38 00   10.68   +0.77   TYC 1622-1921
------------------------------------------------------------

Magnitudes and colours should be accurate to within 0.02
magnitudes for the brighter stars and 0.05-0.10 mag. for the
faintest star. V and B-V from Tycho-2 are transformed from
VT and BT magnitudes by using the method of M. Bessel in
Publ. Ast. Soc. Pacific, 112, 961 (2000). B. Skiff mentions
[vsnet-alert 6099] that star 6 was measured by Krzemenski
and Kraft in 1964 and that its expected R magnitude is
R = 8.64.

                              Yours sincerely,
                              Bjorn H. Granslo

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