Retrieve the Data

Data from a standard reference on the Pleiades by H.L. Johnson and R. I. Mitchell (Ap. J. 128 31 (1958)) and the ZAMS are on the server in /home/data/pleiades. Look for files called johnson_color.dat and zams_color.dat. The Pleiades file contains all of the stars that were identified as members of the cluster on the basis of their proper motion, and for which $B-V$ colors were available, excluding those that were thought to be double stars.

Copy these files to a directory of your own by using these commands from within that directory:

cp /home/data/pleiades/johnson_color.dat ./ 
cp /home/data/pleiades/zams_color.dat ./    
cp /home/data/pleiades/hipparcos_color.dat ./

These files have been edited to make using them simple. A line in the file corresponds to a single star and it contains two entries - $B-V$ and $V$. The file from Johnson's paper has the apparent $V$ magnitude and the measured $B-V$. The file from the Hipparcos data has the absolute $V$ magnitude and $B-V$. The ZAMS file also has the theoretical absolute V magnitude and $B-V$. The full Hipparcos file, for reference, is hipparcos.dat containing

1. Hipparcos catalog number
2. Right Ascension in degrees
3. Declination in degrees
4. Distance $D$ in parsecs
5. Apparent $V$ magnitude $m$
6. Absolute $V$ magnitude $M$
7. $B-V$ color
8. $V-I$ color
9. Proper motion $\mu_\alpha$ in RA (milliarcseconds per year)
10. Proper motion $\mu_\delta$ in Dec (milliarcseconds per year)

It was written with a Fortran format statement

format(1x,i7,1x,f12.8,1x,f12.8,1x,f9.4,1x, 
  f8.4,1x,f8.4,1x,f8.3,1x,f8.3,
  1x,f7.2,1x,f7.2)