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Ch 17 Stars Part 2

Vocabulary

TermDefinition
Speckle Interferometry when many images are combined to make a map of a nearby star's surface
Radius-Luminosity-Temperature Relationship indirect determination of a star's radius once its luminosity and temperature are known
Giant star with a radius between 10 and 100 times that of the Sun
Dwarf star with a radius comparable to, or smaller than, that of the Sun
Supergiant star with a radius between 100 and 1000 times that of the Sun
Stefan-Boltzmann Law shows the energy emitted increases rapidly with an increase in temperature
Solar Unit helpful in comparing other stars' properties with those of the Sun
Hertzsprung-Russell Diagram luminosity vs. temperature (or spectral class) graph for a group of stars
Color-Magnitude Diagram when absolute magnitude is plotted against color index
Main Sequence "line" where most stars are on the H-R diagram from top left to bottom right, which are still fusing hydrogen in their core
Red Dwarf small, cool faint star at the lower-right end of the main sequence on the H-R diagram
White Dwarf dwarf star with a sufficiently high surface temperature; lower-left on the H-R diagram
Red Giant giant star whose surface temperature is relatively low; upper-right on the H-R diagram
Red Supergiant extremely luminous red star; found at the very upper-right on the H-R diagram
Blue Giant large, hot, bright star at the upper-left end of the main sequence on the H-R diagram
Blue Supergiant very largest of the hot, bright stars at the uppermost-left end of the main sequence
Spectroscopic Parallax determines star distance by finding its temperature, then absolute brightness, and finally using its apparent brightness
Spectroscopy study of how atoms absorb and emit electromagnetic radiation
Spectral Class classification based on the strength of stellar spectral lines, which indicates temperature (OBAFGKM)
Cosmic Distance Scale collection of techniques used to indirectly measure distances in the universe
Luminosity Class groups stars according to the width of their spectral lines
Created by: john_bailey720
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