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Measuring Stellar Size

Measuring Stellar Size. Eric nguyen , javier , robin . QUESTION?. Explain how physical laws are used to estimate stellar size and explain how stellar mass is measured. WHAT IS STELLAR SIZE? HOW TO FIND IT. Can estimate using an H-R diagram

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Measuring Stellar Size

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  1. Measuring Stellar Size Eric nguyen, javier, robin

  2. QUESTION? Explain how physical laws are used to estimate stellar size and explain how stellar mass is measured.

  3. WHAT IS STELLAR SIZE? HOW TO FIND IT Can estimate using an H-R diagram H-R Diagram shows Temp and Size relative to other stars Hotter stars to the left Cooler to the right Larger up at the top Smaller at the bottom

  4. Radius-Luminosity-Temperature Relationship Luminosity ∝ radius^2 x termperature^4 Stefan-Boltzmann law

  5. Limits to Stellar Size There is no real limit However stars do have a “feasible range” they may exist at Bigger Stars need more mass to overcome gravity’s pull inward. Many of the largest stars already exploded. Bigger star=shorter lifetime

  6. Stellar Mass Determination Binary systems are observed to find their light curve Light curve reveals orbital period Using Kepler’s third law, P^2 ∝ a^3, the semi-major axis of the stars can be found

  7. Mass’s relationships to radius and luminosity Works for main sequence stars Based on binary system observations

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