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Astrometry Department, U.S Naval Observatory
The primary purpose of this website is to distribute information related to the positions and motions of the stars and planets, mainly to the Defense community.
http://ad.usno.navy.mil/

Can You Pay to Get a Star Named?
The Straight Dope column on a star naming scheme.
http://www.straightdope.com/classics/a3_385.html

Coronae of Dwarf Stars
Highly mathematical explanation of how to calculate the coronae of dwarf stars.
http://astro.uchicago.edu/rranch/vkashyap/Mcorona/

Binary Stars Astronomy Lecture
A single introductory astronomy lecture on Binary Stars, including several useful diagrams.
http://zebu.uoregon.edu/~js/ast122/lectures/lec11.html