Pitt ASTRON 0089 - Stellar Masses, Relationships Pertinent to Stellar Masses, & The Interstellar Medium (2 pages)

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Stellar Masses, Relationships Pertinent to Stellar Masses, & The Interstellar Medium



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Stellar Masses, Relationships Pertinent to Stellar Masses, & The Interstellar Medium

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Lecture number:
19
Pages:
2
Type:
Lecture Note
School:
University of Pittsburgh
Course:
Astron 0089 - Stars, Galaxies and the Cosmos
Edition:
1

Unformatted text preview:

ASTRON 89 1st Edition Lecture 19 Outline of Last Lecture I Center of Mass in Binary Stars II The Hertzsprung Russell Diagram Binary Stars Outline of Current Lecture I Stellar Masses II Correlations and Relationships Important to Stellar Masses III The Interstellar Medium Current Lecture I II Stellar Masses a Most common type of star red dwarf b 8 of stars in our galaxy have masses larger than the Sun c Only 06 of stars in galaxy have masses much larger than the Sun d Why do we see them Because they re so bright The more massive a star is the more luminous it is Correlations and Relationships Important to Stellar Masses a Luminosity is approximately equal to about Mass 4 b Radius of a star is approximately equal to the mass i From bottom right to top left of the band the following is true c LUMINOSITY TEMPERATURE RADIUS MASS ALLINCREASE d Red Giants are not on the main sequence i So the relationships do not apply to red giants Only for the stars on the main sequence e The consequences of the relationships i Mass is related to stellar lifetime The more massive the more fuel it has the longer it will live BUT the luminosity also plays a roll because the more massive the more luminosity it has to generate in order to hold itself up against gravity 1 If it can t hold its luminosity the star will start to shrink It s a balance between gravity and radiation pressure ii How long a star lives depends on how much mass it as but INVERSELY proportional to luminosity More massive the more fuel is used up so actually lifetime shortens by luminosity These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III 1 So stellar lifetime is inversely proportional to the CUBE of the MASS The more massive a star is the shorter its lifetime they will burn up more quickly 2 The most massive stars have the shortest lifetimes they have a lot of fuel but burn it at a very rapid pace 3 On the other



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