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[vsnet-chat 6326] Re: [vsnet-obs 45061] CCD observations by Kis (Apr.+)
- Date: Sat, 10 May 2003 14:10:58 -0300
- To: <skiyota@nias.affrc.go.jp>, <vsnet-chat@kusastro.kyoto-u.ac.jp>
- From: "Sebastian Otero" <varsao@fullzero.com.ar>
- Subject: [vsnet-chat 6326] Re: [vsnet-obs 45061] CCD observations by Kis (Apr.+)
- Cc: "surastronomico" <surastronomico@fullzero.com.ar>,"paula Pietranera" <ppietranera@hotmail.com>,"Lelia" <leliafo@yahoo.com.ar>,"Gabriel Giust" <gag@sinectis.com.ar>,"Federico Claus" <nclaus@infovia.com.ar>,"Cecilia" <cecimacros@yahoo.com.ar>, "BED" <enzodb@fullzero.com.ar>,"Astrid Behrens" <astridbeh@arnet.com.ar>,"Sebastian Otero" <varsao@fullzero.com.ar>
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- Delivered-To: vsnet-chat@ooruri.kusastro.kyoto-u.ac.jp
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- References: <890EA4FC-82C1-11D7-8C62-000A957868FE@nias.affrc.go.jp>
- Sender: owner-vsnet-chat@ooruri.kusastro.kyoto-u.ac.jp
----- Original Message -----
From: <skiyota@nias.affrc.go.jp>
>>>>>>> I think that it also depend on my comparison star, Tycho
5126-355-1 that is the only star is suitable for comparison on my CCD
field.
> I once surveyed this field to check the difference between Hipparcos/
> Tycho magnitudes and traditional variable star charts. As far as I
remember,
> there was a big difference between modern V and Harvard visual photometry,
> which was probably used in many traditional variable star charts.
> Could it have resulted the difference?
Remember that I use PEP(V) sequences so there is no zero-point difference,
specially because the star used by Kiyota-san is bright and has good
photometry in Tycho-2, the same result as in Johnson-V measures: 7.05 with
B-V of 0.09.
Maybe the color difference between comparison and variable is responsible??
Sebastian.
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