H-R Diagram

A graph plotting stars based on the measurements of brightness and temperature

The color of a star is based on its ____________

The hottest stars are

The coolest stars are

Temperature on the x axis of the H-R Diagram increases from _______ to _______ which is different than any other graph we have ever used

The amount of energy a star emits, also known as brightness

This measurement tells us how bright an object appears from Earth

The measure of a star’s brightness as if it were at a standard distance of 10 parsecs from the observer

Stars are classified by the elements they absorb. There are seven main types (O, B, A, F, G, K and M

Our Sun falls within this spectral class

Our Sun is this color of star

About 90 percent of the stars in the universe including our Sun fall within this classification of stars

This is a dying star, our own Sun will turn into this type of star. It has a reddish orange color, high luminosity, low temperature. Spectral class K-M

These are the largest stars in the universe in terms of volume, but are not very massive. The range in colors of reddish orange or blue. They are high luminosity and high or low temperature. Spectral classes K-M or B-A

This is a very small dense star that is usually the size of a planet. It is formed when a low mass star has exhausted all of its fuel. Its color is white and it is low luminosity, high temperature. Spectral class B, O, A

A small and relatively cool star on the main sequence, color is red, low luminosity and low temperature. Spectral Class M