Albireo: The Boy Scout star Chapter 5: Binary stars and stellar masses.

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Presentation transcript:

Albireo: The Boy Scout star Chapter 5: Binary stars and stellar masses

Kepler’s Three Laws of Planetary Motion 1.Planetary orbits are elliptical 2.A planet sweeps out equal areas in equal times 3.P 2 = a 3

M1M1 M2M2 r1r1 r2r2 CM Two stars orbit their center of mass

M1M1 M2M2 a Make one star the focus of an ellipse

Visual binary: not viewed face on

 Centauri system (visual binary)

Spectroscopic binary

MASS-LUMINOSITY RELATION (for MAIN SEQUENCE STARS) L = M  where [L] = L  and [M] = M  Approximately: M < 0.3 M   = M  < M < 3 M   = 3.5 M > 3 M   = 2.8

OBSERVEDAPPROXIMATE FITS

a1a1 a2a2 M1M1 M2M2

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