HR Diagram. Characteristics of Stars  Temperature/Color  Mass  Luminosity Absolute Magnitude Apparent Magnitude.

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Presentation transcript:

HR Diagram

Characteristics of Stars  Temperature/Color  Mass  Luminosity Absolute Magnitude Apparent Magnitude

The Spectral Sequence BluestReddest Hottest Coolest 50,000K1300K O B A F G K M L Oh Boy, an F grade kills me, Louis!

The mass of a star determines the length of its life cycle (how long will it burn).

Sun-like Stars Up to 1.5 times the mass of the Sun

Huge Star From 1.5 to 3 times the mass of the Sun

Giant Star Over 3 times the mass of the Sun

Stellar Nebula (nursery) Sun/main sequence star Massive Star ( Huge & Giant) Red Giant Red Supergiant Planetary Nebula Supernova White Dwarf Neutron Star Black Hole Protostar

 Star size  Distance from Earth  Star temperature Variables which affect a star’s brightness:

Absolute Magnitude Apparent Brightness: The amount of light received on Earth from a star. Apparent Magnitude vs. Actual Brightness: How large and hot a star is in relation to other stars.

Which star looks like it is giving off more light? But, which star is actually giving off more light?

Hotter Stars Cooler Stars Luminous/Brighter Stars Dim Stars

O B A F G K M

Life Cycle of Stars Interactive Investigation HR Diagram Interacative Lab Stellar Evolution/H-R Diagram Simulation Astronomy Place Tutorials x.html

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