Sites

The Formation of Binary Stars (Popularity: )
http://www.phys.lsu.edu/astro/nap98/bf.final.html
Recent observational investigations of the frequency of occurrence of pre-main-sequence binary stars have reinforced earlier suspicions that binary formation is the primary branch of the star-formation process

Interacting Binary Stars (Popularity: )
http://wonka.physics.ncsu.edu/~blondin/AAS/
Nice click-through tour with some great animations about some of the complexities of Binary Systems.

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

Eclipsing Binary Stars (Popularity: )
http://www.physics.sfasu.edu/astro/binstar.html
Information on binary stars and links to online articles.

Mass Transfer in the Binary Star Algol (Popularity: )
http://wonka.physics.ncsu.edu/Astro/Research/Algol/
This site shows the dynamic hydrodynamic models have shown that the circumstellar flow in Algol is relatively independent of the initial speed and direction of the tidal stream. Rather, the ...

Astronomical League Double Star Club (Popularity: )
http://www.astroleague.org/al/obsclubs/dblstar/dblstar1.html
The purpose of the Double Star Club is to introduce observers to 100 of the finest double and multiple stars in the heavens.

International Astronomical Union (Popularity: )
http://www.konkoly.hu:80/IAUC42/
Organization based in Hungary that studies binary stars.

Hubble Separates Stars In The Mira Binary System (Popularity: )
http://oposite.stsci.edu/pubinfo/PR/97/26/PR.html
Hubble Space Telescope News Release/Paper about the discovery of the atmospheric interaction between the giant star Mira and its white dwarf companion star.

Double Stars to Follow (Popularity: )
http://www.prairieastronomyclub.org/dblstar1.htm
A five-part article by Martin Gaskell of the Prairie Astronomy Club.

The Prosper Project (Popularity: )
http://home.tiscali.cz/prosper/index.en.html
Observation program targeted to understand eclipsing binaries without known light ephemeris.

Ask a High-Energy Astronomer: Binary Star Systems (Popularity: )
http://imagine.gsfc.nasa.gov/docs/ask_astro/binary.html
Questions and answers from NASA's Imagine the Universe!

Astronomy Picture of the Day: Binary Stars (Popularity: )
http://antwrp.gsfc.nasa.gov/apod/binary_stars.html
Collection of images.