The Spectral class reference article from the English Wikipedia on 24-Jul-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Spectral class

People like you are child sponsors
In astronomy the term spectral class refers to classifying objects according to their spectral lines, which indicate an object's chemical composition.

It can be used to refer to the classification of:

This is a disambiguation page; that is, one that points to other pages that might otherwise have the same name. If you followed a link here, you might want to go back and fix that link to point to the appropriate specific page.