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Unformatted text preview: Chp. 11 Notes- If distance doubled from star apparent brightness decreases by factor of 2 to the power of the amount distance amplified- 1 parsec is 3.26 light-years- Magnitude scale is backwards- Our sun is in spectrum G- Can measure stars mass if its in a binary system by comparison- From a stars luminosity class we can determine radius- Stellar Radii increase diagonally from lower left to upper right- On H-R diagram stellar masses can be seen for Main Sequence stars. - Spectral type M2, luminosity class is a red supergiant- Supergiant Star radius much larger than 1 AU- Globular clusters contain more stars than open clusters- Main-sequence turnoff point is hottest main sequence star in a cluster telling us the clusters age. - Mass and stage of life of a star determine its innate characteristics. - Watts per square meter for apparent brightness- 1/20 arcseconds is 20 parsecs.- Cannot conclude surface temperature form brightness alone. - Absolute magnitude is the magnitude it would have IF it were a distance of 10 parsecs (32.6 light-years) away. Since its absolute magnitude is larger (meaning dimmer) than its apparent magnitude, it would look dimmer if it were 10 parsecs away --- which means it...
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This note was uploaded on 02/19/2010 for the course AST 1002 taught by Professor Dr.haywoodsmith,jr during the Spring '07 term at University of Florida.
- Spring '07