Environmental Science H-R Diagrams Environmental Science

H-R Diagram Hertzsprung-Russell diagram a plot of star’s temperature vs. luminosity (brightness) Maps the life cycle of stars Star’s location on diagram can indicate both its mass and its relative age

Label your H-R diagram as we move through the next few slides.

Luminosity / Brightness increasing Temperature increasing

Supergiants Luminosity Giants Main Sequence White Dwarfs Temperature

Cool & Bright Hot & Bright The Sun Cool & Dim Hot & dim

Main Sequence Stars A major grouping of stars that forms a narrow band from the upper left to the lower right Includes more than 90 % of stars The Sun is a main sequence star

H-R Diagram Resources https://www.youtube.com/watch?v=588oz17Xj8o https://www.youtube.com/watch?v=jiSN95WX1NA