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

Lecture 18 October 8, 2003 How We Determine Masses of Stars PowerPoint PPT Presentation


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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 >>mV2 = GM/rOr M=V2r/G. From observations of motions of binary stars, one can determine their masses.

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

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

3. We can see orbital motion of Sirius B around Sirius A

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

5. A little gravitational physics If M >>m V2 = GM/r Or M=V2r/G

6. The Types of Binary Stars Visual Binaries Eclipsing Binaries Spectroscopic Binaries

7. Eclipsing Binary Stars (like Algol)

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