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Published byBo Kjær Modified over 5 years ago
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Spectroscopic Binaries…some real data courtesy of Eric Jensen
Note: an Angstrom unit is 1/10 of a nanometer
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The Doppler effect is quite simple – waves “pile up” in the direction of motion, as each successive wave is emitted later, when the source is closer to the observer. Direction of source’s motion
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Same star, 2 successive nights
calcium lithium iron Same star, 2 successive nights
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calcium lithium iron What does it mean that every line shifts to shorter wavelengths from one night to the next?
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Does it mean that the star is moving?
calcium Does it mean that the star is moving? lithium iron More – it means that its speed is changing – it is accelerating.
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the calcium line has llab =6719.0 Angstroms
lithium iron the calcium line has llab = Angstroms measure l = on August 12 and l = on August 13
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20 km/s away from us to 80 km/s toward us in just one day.
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The same spectroscopic binary, on two successive nights.
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A spectroscopic triple system.
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