Astronomy Test 3 Notes Online

Astronomy Test 3 Notes Online - Chp.11Notes...

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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 
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