CRIRES (VLT) Radial Velocity Sensitivity

AI Thread Summary
CRIRES is currently unstable but expected to return to full operation next year. The sensitivity limit for radial velocity measurements is a key concern, particularly in terms of precision in meters per second. Radial velocity measurements are generally more effective for late-type stars (late F, G, K, and M) due to the faster rotation of earlier stars, which leads to rotational broadening of spectral lines. This broadening complicates the fitting process to template spectra, hindering accurate measurements. Overall, the discussion emphasizes the challenges in obtaining precise radial velocity data from different types of stars.
natski
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I know CRIRES is unstable right now but it should be back to full operation next year I hear. Does anyone know what it's limit of sensitivity will be for radial velcoity measurements (in m/s)?
 
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Just as a follow-up question, am I correct in saying that radial velcoity measurements are usually limited to late type stars (late F, G, K and M)?
 
Usually, yes. Earlier stars typically spin faster, and this causes rotational broadening of the spectral lines. This makes it more difficult to fit to template spectra, and therefore more difficult to get accurate radial velocity measurements.
 

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