Spectroscopic Binaries…some real data courtesy of Eric Jensen

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Presentation transcript:

Spectroscopic Binaries…some real data courtesy of Eric Jensen Note: an Angstrom unit is 1/10 of a nanometer

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

Same star, 2 successive nights calcium lithium iron Same star, 2 successive nights

calcium lithium iron What does it mean that every line shifts to shorter wavelengths from one night to the next?

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.

the calcium line has llab =6719.0 Angstroms lithium iron the calcium line has llab =6719.0 Angstroms measure l =6719.5 on August 12 and l =6717.2 on August 13

20 km/s away from us to 80 km/s toward us in just one day.

The same spectroscopic binary, on two successive nights.

A spectroscopic triple system.