Classification+of+Stars

= __**Classification of Stars**__ = = = The main characteristics used to classify stars are the temperature,brightness, and size.
 * 1) Size- there are medium stars, giant stars, super giant stars white dwarf stars and neutron stars.
 * 2) Brightness- a stars brightness is the amount of light they give off. A stars apparent magnitude is how bright the star seems from earth . A star's absolute magnitude is how bright it would be if it were a normal distance away from the sun.
 * 3) Temperature- the star's color reveals its temperature. The cooler stars appear reddish and the hotter stars appear slightly bluer than the sun.

__**Red Dwarf Star**__ Red Dwarfs live for a very long time since they don't use up their fuel quickly Wolf 359
 * they are not as hot as other stars
 * most common type of star
 * not as bright as other stars

__Giant star__

 * The Giant stars are older stars.
 * [[image:http://t3.gstatic.com/images?q=tbn:ANd9GcRMlDDXex3ispqkVJ1hcdPjVsddw1Yq6pMAndlQt8Ampw8Dj3X9ag width="234" height="234"]]
 * They glow very brightly
 * It gets bigger when the helium gets hot and it pushes on the Sun so it stretches and get's bigger Aldebaran

__Super Giant Star__
VY Canis Majoris
 * It's the same as a Giant Star except it is larger and runs out of fuel quicker.
 * They often turn into black holes

__Blue Giant Star__

 * They are large and compact
 * burn fuel quickly
 * extremly bright and rare
 * when they die they create a supernova
 * they live a very short time
 * scientists use them to find places where new stars are forming
 * [[image:http://t3.gstatic.com/images?q=tbn:ANd9GcQT5UXeo-sirT-JKEKHfe94IspT96MNIxp05g4aEWuRZIGFy2Qb1g width="227" height="222"]] Rigel

__Yellow star__
> sun
 * medium-sized
 * live about 10 billion years
 * they become very large and it will shrink again forming a planetary nebula
 * when it dies and cools it will be called a white dwarf star.