Rotational Velocity

Some articles on velocity, rotational, rotational velocity:

Stellar Rotation - Measurement
... of movement that is in the direction of the observer is called the radial velocity ... the portion of the surface with a radial velocity component toward the observer, the radiation is shifted to a higher frequency because of Doppler shift ... The component of the radial velocity observed through line broadening depends on the inclination of the star's pole to the line of sight ...
Galaxy Rotation Curve - Further Investigations
... The rotational dynamics of galaxies are, in fact, extremely well characterized by their position on the Tully-Fisher relation which shows that for spiral galaxies that rotational velocity is uniquely related to ... A consistent way to predict the rotational velocity of a spiral galaxy is to measure its bolometric luminosity and then extrapolate its rotation ... Likewise, knowing the rotational velocity of a spiral galaxy is an excellent indication of its luminosity ...