[vsnet-chat 525] Re: Variable near M27 (Jahn)

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

From vsnet-err-request@kusastro.kyoto-u.ac.jp Fri Aug  8 01:02 JST 1997
Date: 7 Aug 97 10:41:00 +0100
From: J.JAHN@ABBS.heide.de (Jost Jahn)
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Subject: [vsnet-err 23049] Re: [vsnet-chat 519] Variable star near M27
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Bodenteich, den 07.08.97

Dear Gianluca,

I downloaded the region around your variable using USNO A1.0. PLease note  
that the red magnitude of the star is 13.7 and the blue magnitude 17.2!  
The difference of 3.5 is very high. The difference is in most cases only  
2.0 magnitudes.

Did you used different instrument types, filters or CCD for your  
exposures? Often such combinations images such high color differences in  
spectrum also different to the "normal stars".



Jost Jahn, Bodenteich, FAX 05824-4041

Versuchen Sie den astronomischen Ansagedienst: 0581-72033
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