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The Gaia-ESO Survey: Empirical determination of the precision of stellar radial velocities and projected rotation velocities | | R. J. Jackson
; R. D. Jeffries
; J. Lewis
; S. E. Koposov
; G. G. Sacco
; S. Randich
; G. Gilmore
; M. Asplund
; J. Binney
; P. Bonifacio
; J. E. Drew
; S. Feltzing
; A. M. N. Ferguson
; G. Micela
; I. Neguerela
; T. Prusti
; H-W. Rix
; A. Vallenari
; E. J. Alfaro
; C. Allende~Prieto
; C. Babusiaux
; T. Bensby
; R. Blomme
; A. Bragaglia
; E. Flaccomio
; P. Francois
; N. Hambly
; M. Irwin
; A. J. Korn
; A. C. Lanzafame
; E. Pancino
; A. Recio-Blanco
; R. Smiljanic
; S. Van Eck
; N. Walton
; A. Bayo
; M. Bergemann
; G. Carraro
; M. T. Costado
; F. Damiani
; B. Edvardsson
; E. Franciosini
; A. Frasca
; U. Heiter
; V. Hill
; A. Hourihane
; P. Jofre
; C. Lardo
; P. de Laverny
; K. Lind
; L. Magrini
; G. Marconi
; C. Martayan
; T. Masseron
; L. Monaco
; L. Morbidelli
; L. Prisinzano
; L. Sbordone
; S. G. Sousa
; C. C. Worley
; S. Zaggia
; | | Date: |
26 May 2015 | | Abstract: | The Gaia-ESO Survey (GES) is a large public spectroscopic survey at the
European Southern Observatory Very Large Telescope. A key aim is to provide
precise radial velocities (RVs) and projected equatorial velocities (v sin i)
for representative samples of Galactic stars, that will complement information
obtained by the Gaia astrometry satellite. We present an analysis to
empirically quantify the size and distribution of uncertainties in RV and v sin
i using spectra from repeated exposures of the same stars. We show that the
uncertainties vary as simple scaling functions of signal-to-noise ratio (S/N)
and v sin i, that the uncertainties become larger with increasing photospheric
temperature, but that the dependence on stellar gravity, metallicity and age is
weak. The underlying uncertainty distributions have extended tails that are
better represented by Student’s t-distributions than by normal distributions.
Parametrised results are provided, that enable estimates of the RV precision
for almost all GES measurements, and estimates of the v sin i precision for
stars in young clusters, as a function of S/N, v sin i and stellar temperature.
The precision of individual high S/N GES RV measurements is 0.22-0.26 km/s,
dependent on instrumental configuration. | | Source: | arXiv, 1505.7019 | | Services: | Forum | Review | PDF | Favorites | |
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