J/A+A/573/A115 Radial velocities in seven globular clusters (Lardo+, 2015)
The Gaia-ESO Survey: Kinematics of seven Galactic globular clusters.
Lardo C., Pancino E., Bellazzini M., Bragaglia A., Donati P., Gilmore G.,
Randich S., Feltzing S., Jeffries R.D., Vallenari A., Alfaro E.J.,
Allende Prieto C., Flaccomio E., Koposov S.E., Recio-Blanco A.,
Bergemann M., Carraro G., Costado M.T., Damiani F., Hourihane A., Jofree P.,
de Laverny P., Marconi G., Masseron T., Morbidelli L., Sacco G.G.,
Worley C.C.
<Astron. Astrophys. 573, A115 (2015)>
=2015A&A...573A.115L 2015A&A...573A.115L
ADC_Keywords: Clusters, globular ; Radial velocities
Keywords: globular clusters: general
Abstract:
The Gaia-ESO survey is a large public spectroscopic survey aimed at
investigating the origin and formation history of our Galaxy by
collecting spectroscopy of representative samples (about 105 Milky
Way stars) of all Galactic stellar populations, in the field and in
clusters.The survey uses globular clusters as intra- and inter-survey
calibrators, deriving stellar atmospheric parameters and abundances of
a significant number of stars in clusters, along with radial velocity
determinations. We used precise radial velocities of a large number of
stars in seven globular clusters (NGC 1851, NGC 2808, NGC 4372, NGC
4833, NGC 5927, NGC 6752, and NGC 7078) to validate pipeline results
and to preliminarily investigate the cluster internal kinematics.
Radial velocity measurements were extracted from FLAMES/GIRAFFE
spectra processed by the survey pipeline as part of the second
internal data release of data products to ESO.
We complemented our sample with ESO archival data obtained with
different instrument configurations. Reliable radial velocity
measurements for 1513 bona fide cluster star members were obtained in
total. We measured systemic rotation, estimated central velocity
dispersions, and present velocity dispersion profiles of all the
selected clusters, providing the first velocity dispersion curve and
the first estimate of the central velocity dispersion for the cluster
NGC 5927. Finally, we explore the possible link between cluster
kinematics and other physical parameters. The analysis we present here
demonstrates that Gaia-ESO survey data are sufficiently accurate to be
used in studies of kinematics of stellar systems and stellar
populations in the Milky Way.
Description:
Velocities are given for 1826 stars in the field of the globular
clusters NGC 1851, NGC 2808, NGC 4372, NGC 4833, NGC 5927, NGC 6752,
and NGC 7078 observed with FLAMES/GIRAFFE@VLT. The table provides
the individual identifications, coordinates, V magnitudes, velocities
and their associated uncertainties for each star.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 102 7 Comparison between the systemic radial velocities
derived in this paper with literature values
table3.dat 56 1826 ID, coordinates, magnitudes, RVs for stars
in 7 Galactic globular clusters
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See also:
J/A+A/480/397 : XMM observations of NGC 2808 and NGC 4372 (Servillat+, 2008)
J/A+A/490/641 : X-ray sources toward NGC 2808 (Servillat+, 2008)
J/AJ/133/1287 : 24 Galactic globular clusters JHK photometry (Valenti+ 2009)
J/A+A/525/A148 : Radial velocities in NGC 1851 and NGC 1904 (Scarpa+, 2011)
J/A+A/528/A127 : Radial velocities in NGC 2808 (Moni Bidin+, 2011)
J/MNRAS/423/2901 : NGC 6752 multiwavelength survey (Thomson+, 2012)
J/MNRAS/426/1137 : Radial velocities in NGC 1851 (Sollima+, 2012)
J/A+A/567/A69 : Radial velocity + photometry in NGC 4372 (Kacharov+, 2014)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [NGC]
5- 8 I4 --- NGC NGC number
10- 12 I3 --- N* Number of stars used (in table3)
14- 20 F7.2 km/s RV This paper radial velocity
22- 24 F3.1 km/s e_RV This paper rms uncertainty on RV
26- 28 F3.1 km/s sigma This paper velocity dispersion
30- 35 F6.1 km/s RVl Literature radial velocity
37- 39 F3.1 km/s e_RVl Literature rms uncertainty on RV
41- 44 F4.1 km/s sigmal Literature velocity dispersion
46-102 A57 --- Ref Reference for literature velocities
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- NGC Globular cluster NGC number
6- 8 I3 --- Star [1/783] Star ID number in NGC cluster
11- 21 F11.7 deg RAdeg Right ascension (J2000.0)
24- 34 F11.7 deg DEdeg Declination (J2000.0)
36- 40 F5.2 mag Vmag [11/19.2] Johnson V magnitude of star
42- 48 F7.2 km/s RV [-475/336] Radial velocity
53- 56 F4.2 km/s e_RV [0.01/0.95] Uncertainty on RV
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Acknowledgements:
Carmela Lardo, C.Lardo(at)ljmu.ac.uk
(End) Carmela Lardo [LJMU, UK], Patricia Vannier [CDS] 10-Dec-2014