blueshift

"blueshift", methods for determining whether a star is moving away from or towards you respectively.

BellaOnline - The Voice of Women 2009

The spectrograph allowed the researchers to monitor the redshift or blueshift of light as the planet orbited the star.

Second Exoplanet with Retrograde Orbit Discovered | Universe Today 2009

First with the dipole motion, the redshift/blueshift pattern caused by our motion.

How To Live 2009

I believe we would, except that the redshift of the classical Doppler Effect is exactly cancelled out by the gravitational blueshift caused by the cosmic gravitation field.

Does Space Expand? Sean 2008

In the mean-velocity Doppler model, the blueshift acceleration experienced by the travelling photon is essentially the same contractive gravitational acceleration experienced by the galaxies in the Hubble Flow, so the photon does not experience any gravitational time dilation which differs from the underlying time dilation inherent in the FLRW metric.

Does Space Expand? Sean 2008

Because acceleration is so dominant, the net effect is that the potential decays while the photon traverses the well, meaning that the photon emerges with a slight net blueshift, compared to how it entered.

Evolving Potentials Mark 2008

So the initial acceleration toward the observer (which causes blueshift) is very high.

Does Space Expand? Sean 2008

Prof. Peacock combines an integration of SR redshift and gravitational blueshift.

Does Space Expand? Sean 2008

This is the gravitational blueshift effect that Prof. Peacock describes in his “diatribe” and which Matt, Geraint, Luke and Berian allude to in their recent radar ranging paper.

Does Space Expand? Sean 2008

That is, the collapse action of the cosmic gravitation imparts a blueshift (like an accelerating moving sidewalk) to the photon, which exactly offsets and compensates for its classical Doppler redshift.

Does Space Expand? Sean 2008