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[vsnet-chat 6287] Re: color conversion

 

dear friend:

If you want to convert JH(Ks) photometry  to B-V color for spectral type calculation you must to consult an excelent paper by M.S. Bessell & J.M. Brett "JHKLM Photmetry: Standard Systems, Passbands, and Intrinsic colors" published in 1988, PASP 100, 1134B. In this paper you have tables and diagram which relate Spectral type with V-I, V-K, H-K, J-K, colors. It you know V-I vs B-V relation you have solve the problem. But you must to know the luminosity class of your star.

Greetins.

--
=============================================================
Francisco Manuel Rica Romero
Coordinador Sección Estrellas Dobles LIADA
Agrupación Astronomica de Merida
Mérida (Badajoz) España
FRICA0@terra.es
(web Estrellas Dobles:
http://vsnet.terra.es/personal/fco.rica/home.htm)
=============================================================
 
 
 
 

DWest61506@aol.com escribió:
In a message dated 5/1/2003 7:45:11 PM Central Daylight Time, comet@aerith.net writes:
 
 
Dear colleagues,

Does anyone know a web page which shows a color conversion diagram or
formula between 2MASS JHKs color and UBVRI color, or GSC2 JFN color
and UBVRI color?

For example, a diagram between 2MASS J-Ks and Johnson B-V, or between
GSC2 J-F and Johnson B-V.

On 2MASS color, I know the page:

  http://ftp.lowell.edu/pub/bas/starcats/uvby.calib

is helpful. But I would like to see a diagram or conversion formula,
too, if exists.

On GSC2 color, I found "gsc2_johnson_kron_cousins.txt" in GOOGLE
cache, but the original file is now not found...

Thanks in advance,

--
Seiichi Yoshida

Seiichi:
I have a few conversion formulas on http://members.aol.com/dwest61506/page53.html. Click on "Photometric Conversion Formulas".  I may have some of what you need.
Regards,
Doug West

 
 

 
 

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