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Re: [vsnet-lpv 94] R Lep very faint minimum
> ...or just a color problem...
> We have discussed it several times. 1.5 mag. difference is too much but it
> is possible.
> It's important to have in mind that it is very different to estimate the
> brightness of a bright red star than to estimate a faint
> one. The techniques that should be used to stick to V (or to get closer..)
> are the opposite in the different cases.
> With a naked eye variable we should avoid using direct vision and staring.
> BUT wiht faint telescopic or binocular stars, we need to stare and perceive
> the concentrated point of light in its full brightness if we want to make a
> good comparison. Otherwise we'll be greatly underestimating our variable's
> brightness.
During a minimum of 1999, S. Kiyota-san made contemporaneous CCD
multicolor photometry, which amazingly depicted personal color transformation
coefficients. Kiyota-san could have done the same observations, but
we have received not observations yet in this season... Although CCD
observations have an advantage in terms of accuracy, visual observations
seem to have a greater advantage of continuity of observations!
The typical lifetime of interest of CCD people on a specific target seems
to be well shorter than a year...
Regards,
Taichi Kato
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
