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[vsnet-chat 537] Red variables and high B-V values -Reply
- Date: Sun, 10 Aug 1997 10:58:32 +0300
- To: bas@lowell.edu
- From: Berto Monard <lagmonar@csir.co.za>
- Subject: [vsnet-chat 537] Red variables and high B-V values -Reply
- Cc: vsnet-chat@kusastro.kyoto-u.ac.jp
- Disclaimer: The CSIR exercises no editorial control over E-mail messages originating in the organisation and the views in this message are therefore not necessarily those of the CSIR and/or its employees.
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- Sender: owner-vsnet-chat@kusastro.kyoto-u.ac.jp
Re:
>>> Brian Skiff <bas@lowell.edu> 8/August/1997 10:11pm >>>
Masi's CCD frames were both unfiltered images, so any
changes in
spectral sensitivity mimicking variability would be minimal. The
A1.0
catalogue was generated (in the north) from the original POSS-I
blue and
red plates, which were taken back-to-back, so the color is a real
effect.
\Brian
///
Hi,
for all sense and purposes, it was not the intention to refute the
variability of Gianluca's 'new' variable, but to indicate the leverage
effect occuring in the case of variables with a high B-V value
(read: very red stars) on their apparent variablity in V and v(isual)
magnitudes.
If the variability of a very red star shows in wideband radiometry
(as in unfiltered CCD measurements) it must be real. The point is
that one can expect a much more pronounced variability in V and
in visual observations (and with large discrepancies in estimates
between observers )!
Regards,
berto
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