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2012MNRAS.420.2874F - Mon. Not. R. Astron. Soc., 420, 2874-2883 (2012/March-2)
Comparing radial velocities of atmospheric lines with radiosonde measurements.
FIGUEIRA P., KERBER F., CHACON A., LOVIS C., SANTOS N.C., LO CURTO G., SARAZIN M. and PEPE F.
Abstract (from CDS):
The RV model fitting yielded results similar to that of Figueira et al., with lower wind magnitude values and varied wind direction. The probes confirmed the average low wind magnitude and suggested that the average wind direction is a function of time as well. However, these results are affected by large uncertainty bars that probably result from a complex wind structure as a function of height. The two approaches deliver the same results in what concerns wind magnitude and agree on wind direction when fitting is done in segments of a couple of hours. Statistical tests show that the model provides a good description of the data on all time-scales, being always preferable to not fitting any atmospheric variation. The smaller the time-scale on which the fitting can be performed (down to a couple of hours), the better the description of the real physical parameters is. We then conclude that the two methods deliver compatible results, down to better than 5 m/s and less than twice the estimated photon noise contribution on O2lines' RV measurement. However, we cannot rule out that parameters α and γ (dependence on airmass and zero-point, respectively) have a dependence on time or exhibit some cross-talk with other parameters, an issue suggested by some of the results.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): atmospheric effects - instrumentation: spectrographs - methods: observational - techniques: radial velocities
Simbad objects: 13
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