- American Association of Variable Star Observers (AAVSO)
The American Association of Variable Star Observers (AAVSO) is a non-profit worldwide scientific and educational organization of amateur and professional astronomers who are interested in stars that change in brightness or variable stars.
http://www.aavso.org/
(Added: Wed Oct 23 2002)
- Double and Multiple Stars
What are the differences between double stars, variable stars and binary stars?
http://edu-observatory.org/eo/double_stars.html
(Added: Wed Oct 30 2002)
- Eclipsing Binary Stars
The site contains information about modeling light curves for eclipsing binary stars. There are several online articles and Windows based programs.
http://www.physics.sfasu.edu/astro/binstar.html
(Added: Sun Oct 06 2002)
- Eclipsing Binary Stars - (Interactive)
This Java Applet allows the user to change the parameters of a binary star system to see the effects on light curves. Orbiting stars which are separated by a small distance may pass in front of one another. It is not possible for astronomers to see the individual stars, but there will be a change in the total light coming from the two stars when they "eclipse" one another. This simulation shows how this eclipse happens.
http://instruct1.cit.cornell.edu/courses/astro101/java/eclipse/eclipse.htm
(Added: Sun Oct 06 2002)
- Orbiting Binary Stars - (Interactive)
This Java Applet allows you to set the masses, orbital separation, orbital eccentricity, the inclination angle to our line of sight, and the angle of the nodes of an orbiting star pair. The user can then see the effects on the spectra and radial velocity curves.
http://instruct1.cit.cornell.edu/courses/astro101/java/binary/binary.htm
(Added: Sun Oct 06 2002)
- Types of Variable Stars
Variable Stars are stars that vary in their light output. The origins of these light variations define the classification system of variable stars. The AAVSO offers a description here of each type of variable star.
http://www.aavso.org/vstar/types.stm
(Added: Sat Oct 26 2002)
- Variables
The Astronomer magazine has a large and active group of variable star observers. This page contains information on some of the more interesting objects.
http://www.theastronomer.org/variables.html
(Added: Wed Oct 30 2002)
- Visual Binary Stars
Visual binary stars are those in which the two stars can be resolved from each other. This is an observational criterion. Given atmospheric seeing, it is hard with standard telescopes to resolve stars which are less than about 0.15" apart.
http://www.astro.soton.ac.uk/~trm/PH112/notes/notes/node74.html
(Added: Wed Oct 30 2002)
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