- A Star's Life Cycle
Highlights the various phases of a star's life-cycle from initial coalescence to extinction as a brown dwarf or explosion as a supernova.
http://www.netlabs.net/hp/tremor/stars.html
(Added: Mon Oct 07 2002)
- Brown Dwarfs
Originally called black dwarfs (and often called coffee dwarfs in Mexico), these substellar objects were first conceived of in the early 1960s as dark bodies floating freely in space.
http://www.sigmaxi.org/amsci/articles/97articles/martinintro.html
(Added: Sat Oct 26 2002)
- Fusion Sequences in Stars
All stars derive their energy through the thermonuclear fusion of light elements in to heavy elements. Watch these animations on the types of fusion in stars.
http://zebu.uoregon.edu/textbook/energygen.html
(Added: Sun Oct 27 2002)
- H-R Diagram and Stellar Evolution - Applet
The Java Applet shows how stars evolve and move on the Hertzsprung-Russell diagram. Stars on the main-sequence generate energy by converting (via fusion) hydrogen into helium. As stars use up their hydrogen fuel, they evolve off the main-sequence into the giant or supergiant phase.
http://instruct1.cit.cornell.edu/courses/astro101/java/evolve/evolve.htm
(Added: Sat Oct 26 2002)
- Hertzsprung-Russell Diagram
A log-log diagram of stellar luminosity (y-axis) vs. temperature (increasing to the left on the x-axis by convention, sometimes parameterized by spectral type, or color).
http://scienceworld.wolfram.com/astronomy/Hertzsprung-RussellDiagram.html
(Added: Sat Oct 26 2002)
- How Stars Work
Howstuffworks examines the nature of stars, types of stars, how stars form and how stars die.
http://www.howstuffworks.com/star.htm
(Added: Sun Oct 27 2002)
- Jean's Radius
How big must a cloud of gas and dust be before gravity overwhelms gas pressure so that it will collapse? The size is essentially given by this formula, which was formulated by Jeans.
http://www.dc.peachnet.edu/~fbuls/ast102/part1/jeans.htm
(Added: Sat Oct 26 2002)
- Life Cycle of a Star
As the star goes through its life cycle, it moves along the HR diagram from one place to another.
http://curious.astro.cornell.edu/question.php?number=38
(Added: Sat Oct 26 2002)
- Nucleosynthesis
Stars are giant nuclear reactors. In the center of stars, atoms are taken apart by tremendous atomic collisions that alter the atomic structure and release an enormous amount of energy.
http://www.enchantedlearning.com/subjects/astronomy/stars/fusion.shtml
(Added: Sat Oct 26 2002)
- Proton-Proton Chain
The Proton-Proton or PP Chain (hydrogen fusion) is important in stars the mass of the Sun and less.
http://csep10.phys.utk.edu/astr162/lect/energy/ppchain.html
(Added: Sun Oct 27 2002)
- Stellar Evolution
Stellar Evolution is a great article on the life and death of stars provided by Astronomy Today.
http://www.astronomytoday.com/cosmology/evol.html
(Added: Sun Oct 27 2002)
- Stellar Evolution I - Solar Type Stars
Follow the life of our Sun from its birth from a hydrogen cloud, through its red giant phase, to its end as a white dwarf.
http://casswww.ucsd.edu/physics/ph7/StevI.html
(Added: Sat Oct 26 2002)
- Stellar Evolution II - Massive Stars
Follow the life of a high mass star from its birth from a hydrogen cloud, through its red supergiant phase, to its supernova ending.
http://casswww.ucsd.edu/physics/ph7/StevII.html
(Added: Tue Oct 29 2002)
- Stellar Evolution Simulation - (Interactive)
This Java Applet shows how stars evolve on a Hertzsprung-Russell diagram. It shows that the determining factor in the life of a star is its mass.
http://instruct1.cit.cornell.edu/courses/astro101/java/evolve/evolve.htm
(Added: Sun Oct 06 2002)
- The CNO Cycle
In stars the primary constituents are hydrogen and helium, but there are usually (much) smaller amounts of heavier elements present. In particular there can be Carbon (C), Nitrogen (N), and Oxygen (O) ions. If these are present, they can participate in the sequence of reactions illustrated.
http://csep10.phys.utk.edu/astr162/lect/energy/cno.html
(Added: Tue Oct 29 2002)
- The Life Cycle of Stars - MAP Cosmology 101
This page contains some basic information about the lives of stars and the "MAP" mission. MAP is a NASA Explorer mission that will measure the temperature of the cosmic background radiation over the full sky with unprecedented accuracy.
http://map.gsfc.nasa.gov/m_uni/uni_101stars.html
(Added: Sun Oct 06 2002)
- The Nature of Stars
This page presents facts about stars as we know them without delving into the details of discovery. It contains lots of definitions.
http://www.astro.uiuc.edu/~kaler/sow/star_intro.html
(Added: Sat Oct 26 2002)
- Variable Stars
Find out more about all types of variable stars.
http://scienceworld.wolfram.com/astronomy/VariableStar.html
(Added: Sat Oct 26 2002)
- Vogt-Russell Theorem
Henry Norris Russell (1877-1957) showed that the physical properties of a star at each stage of its evolution can be found solely from its mass, chemical composition, and age (the Vogt-Russell theorem).
http://www.physics.gmu.edu/classinfo/astr103/CourseNotes/ECText/Bios/russell.htm
(Added: Sat Oct 26 2002)
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