Astro 102 notes15. Surveying the StarsHow Can we Study the Life cycles of stars?
Luminosity: Amount of power a star radiatesApparent brightness: amount of starlight that reaches earthParallax – Apparent wobble of a star due to the Earth’s orbiting of the SunMEASURING DISTANCES TO STARS (GET NOTES)Let’s define1parsec – 206,265A.U. = 3.26 light years d=1/pIf p is in arcsec and d is in parsecs, A star with a parallax of 1 arcsec is 1 parsec distant. The distances of nearer stars may be measured by observing their apparent motion as – theearth orbits around the sunIf the parallax of a star is mesasured to be 0.1 arseconds, its distance is 10 parsecs
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Stellar classification, main sequence, Red Giants, Stella Luminosity