Binary Stars
description
Transcript of Binary Stars
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Binary Stars
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Double Stars/Binary Stars
Binary Star
Double StarEarth
Earth
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Visual Binary Stars
Orbit of Star 1
Orbit of Star 2
Center of Mass
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Sirius A & B
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Orbit of 12 Persei(Barlow, Scarfe, and Fekel
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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 binariesPossible planet detection
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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
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Spectroscopic Binary Stars
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Radial Velocity Curve
HDE 226868
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Spectroscopic Binaries
Orbital Periods are several daysStars are close together
Orbits inclined 90° to sky are discovered this way.
All of the extra-solar planets have been found in this way.
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Roche Lobes
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Classifications
Detached65 RT And
Semi-detached203 U Cep
Over-Contact12 XY Leo
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Star Light Pro
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Eclipsing Binaries
Chances of finding an eclipsing binaryInclined 90° to skyStars close together
Same conditions as spectroscopic binaryMany are discovered in both ways
Eclipsing binaries also permit radius to be determined
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Relative radius
Eclipse beginsseparation = sum of radii
Second contactseparation = difference in radii
Time difference between these events gives radii of stars
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Mass-Luminosity Relationship
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