Lecture 06: The Motions of the Stars Astronomy 162 - Stars, Galaxies, & the Universe
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The "fixed stars" are really in constant motion, but these motions
are too small to see with the human eye in a human lifetime. This
lecture introduces proper motions (apparent angular motion of the
stars in the sky), radial velocities (motion towards or away from
us measured using the Doppler Shift of the star's spectral lines),
and true space velocities, measured by combining three key observables:
the proper motion, radial velocity, and distance to the star. Recorded
2006 January 10 in 1008 Evans Laboratory on the Columbus campus of
The Ohio State University.
The "fixed stars" are really in constant motion, but these motions
are too small to see with the human eye in a human lifetime. This
lecture introduces proper motions (apparent angular motion of the
stars in the sky), radial velocities (motion towards or away from
us measured using the Doppler Shift of the star's spectral lines),
and true space velocities, measured by combining three key observables:
the proper motion, radial velocity, and distance to the star. Recorded
2006 January 10 in 1008 Evans Laboratory on the Columbus campus of
The Ohio State University.