This work was sponsored by a generous grant from the Hirsch family of Los Angeles, which supported Eirik Harris, provided travel money and computer resources for the project. Additional computational support was provided by a grant from the Mellon Foundation and the Pomona College physics and astronomy department. We also would like to thank John Bahcall of the Princeton Institute for Advanced Study for making the `galaxy' program available over the internet. We would like to thank the referees, U. Mebold, and K. de Boer for many useful comments which greatly improved the paper. K. de Boer is also to be thanked for pointing out the effects of reddening and chromospheric activity on the index.
© European Southern Observatory (ESO) 2000
Online publication: January 29, 2001