Lecture 06: The Motions of the Stars
The "fixed stars" are really in constant motion, but these motions\nare too small to see with the human eye in a human lifetime. This\nlecture introduces proper motions (apparent angular motion of the\nstars in the sky), radial velocities (motion towards or away from\nus measured using the Doppler Shift of the star's spectral lines),\nand true space velocities, measured by combining three key observables:\nthe proper motion, radial velocity, and distance to the star. Recorded\n2006 January 10 in 1008 Evans Laboratory on the Columbus campus of\nThe Ohio State University.