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A Sea of Stars

by: Alyssa Karounos

A Sea of Stars Astr 1010-100

Alyssa Karounos
GPA 3.9
Introductory Astronomy 1
Dr. Oliver Fraser

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About this Document

On One lecture: explains how to read H-R diagrams for Stellar temperature, radii, and luminosities
Introductory Astronomy 1
Dr. Oliver Fraser
Class Notes
astonomy, h-r diagram
25 ?




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This 2 page Class Notes was uploaded by Alyssa Karounos on Friday February 13, 2015. The Class Notes belongs to Astr 1010-100 at University of Washington taught by Dr. Oliver Fraser in Winter2015. Since its upload, it has received 114 views. For similar materials see Introductory Astronomy 1 in Astronomy at University of Washington.


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Date Created: 02/13/15
2915 1 Goals A Read HR diagrams for Stellar temperature radii and luminosities 11 What spectra tells us A the horizontal aXis of spectra is changing wavelength B If spectra were formed with a bunsen burner the sample would be a bright light emission spectra because you re burning it and it s emitting light 1 a sample of something can only show light through selective values only option to emit light because there s no source C Which star is hottest l something that emits light that s hot emits a lot of light with very little gaps 2 can t tell because it snot simple to go from emission lines to temperature because they re made of the same stuff D If these spectra were from stars they would be dark line absorption spectra because a gas cloud absorbs light E Stars get hotter as you go in F Which star has the most different types of elements 1 all stars have similar compositions G M stars have a cool atmosphere which isn t hot enough to make Hydrogen move from the ground state up an energy level H O stas are so hot they have ionized all of their hydrogen already III HR Diagram A Uses L R2T4 B theory based C Luminosity versus Temperature D plotting luminosity and color E L on y aXis and C on X aXis F learned that things fall into a pattern 1 The Main Sequence bottom right is small and red up to top left that is bigger and blue 2 with comer group of gas giants G Color Magnitude Diagram 1 uses brightness instead of luminosity 2 observation based 3 based on color iz EM Lila i 233 11E ME 1 i r1quot Iiill I SIEIUE EL JLLTI I ra39l lj39i E r quot quot F39I39 n 5T3 i r ul39h 3quot ll lial rm


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