Questions tagged [radial-velocity]
46 questions
5
votes
2 answers
Radial Velocity Clarification Sought
According to Google, radial velocity is "the velocity of a star or other body along the line of sight of an observer".
The radial velocity of Sirius according to Google is −5.50 km/s.
If the number is positive, does that mean it's moving away or…
MiscellaneousUser
- 1,311
- 10
- 25
3
votes
1 answer
Radial velocities - wings and core
Why are radial velocities measured at the core and at wings of a line profile? I mean interactive measurement -- comparing the direct and flipped images of the line profiles.
What is the difference of these radial velocities (I do not mean values)?…
Elisabeth
- 153
- 4
2
votes
1 answer
Computing radial-velocities from Cross Correlation data
How can I better fit a Gaussian curve to a CCF so that I get the most precise RV value? The image below shows the fitting where I compared the fitting by weighting by the uncertainties and not. There is not a big difference between them because the…
