Position on the Hertzsprung-Russell Diagram
The H-R Diagram
-90% of stars that are plotted on the H-R diagram fit into a diagonal band, its called the main sequence
-The lower right corner on the diagram are the cooler, reddish stars that are dim
-Upper left corner stars on the diagram are very hot and bluish
-Stars that are cooler have a greater surface area than hotter ones which more light is produced
-Large, bright, cool stars are called Red Giants
-Small, dim, hot stars are called White Dwarfs
-Stars that are the hottest most luminous and are very large are called Blue Super giants
Main Sequence Stars
-Main sequence stars vary in temperature
-The hotter more luminous the star is the more massive
-Cooler and less luminous stars are less massive
-Main sequence stars fuse hydrogen to produce helium, stars don't move through main sequence as they age
When a star is formed a particular mass stays in main sequence until hydrogen is used up
-90% of stars that are plotted on the H-R diagram fit into a diagonal band, its called the main sequence
-The lower right corner on the diagram are the cooler, reddish stars that are dim
-Upper left corner stars on the diagram are very hot and bluish
-Stars that are cooler have a greater surface area than hotter ones which more light is produced
-Large, bright, cool stars are called Red Giants
-Small, dim, hot stars are called White Dwarfs
-Stars that are the hottest most luminous and are very large are called Blue Super giants
Main Sequence Stars
-Main sequence stars vary in temperature
-The hotter more luminous the star is the more massive
-Cooler and less luminous stars are less massive
-Main sequence stars fuse hydrogen to produce helium, stars don't move through main sequence as they age
When a star is formed a particular mass stays in main sequence until hydrogen is used up
