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Three types of binary stars.

Three types of binary stars.

Three types of binary stars.

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How can we find the orbital period for<br />

spectroscopic binaries?<br />

1. Watch the <strong>stars</strong> orbit each<br />

other and see how long it<br />

takes<br />

2. Watch for the absorption<br />

lines to return to their original<br />

wavelength<br />

3. Measure the masses and<br />

compute the period

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