[vsnet-alert 5147] Re: SY Vol bright outburst (Skiff)

[Taichi Kato <tkato>]

From bas@lowell.edu Tue Jul 25 14:39 JST 2000
Date: Mon, 24 Jul 2000 22:39:38 -0700 (MST)
From: Brian Skiff <bas@lowell.edu>
To: tkato@kusastro.kyoto-u.ac.jp
Subject: Re: [vsnet-alert 5146] SY Vol bright outburst
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Content-Length: 790

     Kato-san quotes the USNO-A1.0 magnitudes as evidence that SY Vol 
has a fairly large outburst amplitude.  The corresponding A2.0 values are:
mb=19.7 and mr=17.2.  My experience in compiling deep sequences for the
far-southern fields in A2.0 is that the red magnitudes run typically about
0.5 too bright for stars brighter than R ~18.5, and that the blue magnitudes
have somewhat larger offsets at the faint end (as with the candidate here).
Thus I would suggest the cadidate has a quiescent Cousins R magnitude of
about 17.7 and quiescent B magnitude of about 20.5.
     The A2.0 position end-figures are 28s.70, 30".1; the ~0".9 difference
with respect to A1.0 results from the poor astrometric reference frame used
in A1.0, which is particularly noticeable in the far south.

\Brian

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