Lecture 18 – October 8, 2003 How We Determine Masses of Stars

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Presentation transcript:

Lecture 18 – October 8, 2003 How We Determine Masses of Stars Method:observation of binary stars (double stars)

Binary stars are numerous (e.g. Sirius)

We can see orbital motion of Sirius B around Sirius A

Masses of stars determine the gravitational force, and thus the acceleration of the stars

A little gravitational physics If M >>m V2 = GM/r Or M=V2r/G From observations of motions of binary stars, one can determine their masses

The Types of Binary Stars Visual Binaries Eclipsing Binaries Spectroscopic Binaries

Eclipsing Binary Stars (like Algol)