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mass function

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

mass function A mathematical relationship between the masses of the components in a spectroscopic binary and the orbital inclination. It is the only information about the masses that can be derived when the spectrum of just one star is visible. If that star is of mass m₁ (in solar units), then the mass function is given by (m₂sini)³/(m₁+m₂)³, where m₂ is the mass of the unseen star and i is the inclination of the orbit.

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