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HR Diagram

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by

Michelle Hernandez

on 18 January 2016

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Transcript of HR Diagram

The H-R Diagram can be used to identify the characteristics and understand the life cycle of a star.
The H-R Diagram
What are some ways the stars in the photo could be grouped or classified?
Astronomers classify stars by their:

Temperature
Mass
Size
Luminosity (brightness, magnitude)
Hertzsprung Russell Diagram (HR Diagram) -
a graph that plots luminosity vs. temperature of stars
(luminosity)
very bright
very hot
cooler
dim
Red Stars = cool
Blue Stars = hot
sun
Luminosity (sun = 1)
Temperature
cool
bright
hot
bright
hot
dim
cool
dim
It is used to determine distances of the stars.
Y - axis
X - axis
The
Sun (medium size star)
is found in the
Main Sequence.
(magnitude)
4 Categories:
Super Giants
Giants
Main Sequence
White Dwarfs
bigger stars
smaller stars
Hot
Bright
Hot
Dim
Cool
Bright
Cool
Dim
Full transcript