Measuring Stars What We Want to Know •Brightness •Temperature Easy •Composition •Distance Hard •Luminosity •Size (Radius) •Mass Binary Stars lpeak T = 2900 Km •Spectrum tells you composition (M+m)P2 = a3 •Spectrum also tells.

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Transcript Measuring Stars What We Want to Know •Brightness •Temperature Easy •Composition •Distance Hard •Luminosity •Size (Radius) •Mass Binary Stars lpeak T = 2900 Km •Spectrum tells you composition (M+m)P2 = a3 •Spectrum also tells.