Binary Stars. Double Stars/Binary Stars Binary Star Double Star Earth.

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Presentation transcript:

Binary Stars

Double Stars/Binary Stars Binary Star Double Star Earth

Visual Binary Stars Orbit of Star 1 Orbit of Star 2 Center of Mass

Sirius A & B

Orbit of 12 Persei (Barlow, Scarfe, and Fekel

Visual Binaries  Stars must be either close to us or far from each other.  Long orbital periods indicate they are far from each other. (years to decades)  About 10% of all stars are visual binaries  Possible planet detection

Spectroscopic Binaries Spectrum of Hydrogen in Lab Spectrum a Star…..Day 1 What do these spectra tell us about the star? Spectrum a Star…..Day 2 Spectrum a Star…..Day 3 Spectrum a Star…..Day 4

Spectroscopic Binary Stars

Radial Velocity Curve HDE

Spectroscopic Binaries  Orbital Periods are several days  Stars are close together  Orbits inclined  90° to sky are discovered this way.  All of the extra-solar planets have been found in this way.

Eclipsing Binary Stars

Roche Lobes

Classifications Detached 65 RT And Semi-detached 203 U Cep Over-Contact 12 XY Leo

Star Light Pro

Eclipsing Binaries  Chances of finding an eclipsing binary  Inclined  90° to sky  Stars close together  Same conditions as spectroscopic binary  Many are discovered in both ways  Eclipsing binaries also permit radius to be determined

Relative radius Eclipse begins separation = sum of radii Second contact separation = difference in radii Time difference between these events gives radii of stars

Mass-Luminosity Relationship

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