2015A&A...580A..75J

Query : 2015A&A...580A..75J

2015A&A...580A..75J - Astronomy and Astrophysics, volume 580A75-75 (2015/8-1)

The Gaia-ESO Survey: Empirical determination of the precision of stellar radial velocities and projected rotation velocities.

JACKSON R.J., JEFFRIES R.D., LEWIS J., KOPOSOV S.E., SACCO G.G., RANDICH S., GILMORE G., ASPLUND M., BINNEY J., BONIFACIO P., DREW J.E., FELTZING S., FERGUSON A.M.N., MICELA G., NEGUERELA I., PRUSTI T., RIX H.-W., VALLENARI A., ALFARO E.J., ALLENDE PRIETO C., BABUSIAUX C., BENSBY T., BLOMME R., BRAGAGLIA A., FLACCOMIO E., FRANCOIS P., HAMBLY N., IRWIN M., KORN A.J., LANZAFAME A.C., PANCINO E., RECIO-BLANCO A., SMILJANIC R., VAN ECK S., WALTON N., BAYO A., BERGEMANN M., CARRARO G., COSTADO M.T., DAMIANI F., EDVARDSSON B., FRANCIOSINI E., FRASCA A., HEITER U., HILL V., HOURIHANE A., JOFRE P., LARDO C., DE LAVERNY P., LIND K., MAGRINI L., MARCONI G., MARTAYAN C., MASSERON T., MONACO L., MORBIDELLI L., PRISINZANO L., SBORDONE L., SOUSA S.G., WORLEY C.C. and ZAGGIA S.

Abstract (from CDS):

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 (vsini) for representative samples of Galactic stars, which 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 vsini 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 vsini, 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, which enable estimates of the RV precision for almost all GES measurements, and estimates of the vsini precision for stars in young clusters, as a function of S/N, vsini and stellar temperature. The precision of individual high S/N GES RV measurements is 0.22-0.26km/s, dependent on instrumental configuration.

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Journal keyword(s): stars: kinematics and dynamics - open clusters and associations: general

VizieR on-line data: <Available at CDS (J/A+A/580/A75): table2.dat>

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
2 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
3 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 307 0
4 NGC 2547 OpC 08 10 01.5 -49 12 08           ~ 445 0
5 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
6 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
7 IC 4665 OpC 17 46 04.0 +05 36 54           ~ 407 0
8 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0

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