[Aavso-photometry] BVRI vs. griz

[pcyoung]

In brief it matches ccd detectors broadening the effective spectral  
range specifically this is a system for ascribing luminosity and  
spectral classification , provisionslly red shift determinaton  i will  
forward a good article that desvribes it in greater detail
Sent from my iPhone

On Jun 23, 2009, at 7:13 AM, Tom Krajci <tom_krajci at tularosa.net> wrote:

> Why did the pro's make the switch from BVRI to griz?
>
> Is there an astrophysics advantage?  (Better, more accurate  
> classification/ID of stars because the bandpasses don't overlap?)
>
> Is it a better match for typical CCD response?
>
> Other?
>
> Thanks in advance.
>
> -- 
> -------------------------------------------
> Tom Krajci
> Cloudcroft, New Mexico
> http://picasaweb.google.com/tom.krajci
>
> Center for Backyard Astrophysics (CBA)
> http://cbastro.org/ CBA New Mexico
>
> American Association of Variable Star
> Observers (AAVSO): KTC http://www.aavso.org/
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