NGC5694 radial velocities and metallicities : J/MNRAS/446/3130


Authors : Bellazzini M. orcid , Mucciarelli A., Sollima A. (hide) , Mucciarelli A., Sollima A. et..al

Bibcode : 2015MNRAS.446.3130B (ADS) (Simbad) (Objects) (hide)

CDS Keywords : Clusters, globular; Radial velocities; Abundances, [Fe/H]
UAT : Globular star clusters, Radial velocity, Metallicity

Observation (OC)

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Inserted into VizieR : 09-Nov-2015
Last modification : 14-Aug-2024

Kinematics of a globular cluster with an extended profile NGC 5694. (2015)

Keywords : stars abundances - globular clusters: individual: NGC 5694

Abstract:We present a study of the kinematics of the remote globular cluster NGC 5694 based on GIRAFFE@VLT medium-resolution spectra. A sample of 165 individual stars selected to lie on the red giant branch in the cluster colour-magnitude diagram was considered. Using radial velocity and metallicity from Calcium triplet, we were able to select 83 bona fide cluster members. The addition of six previously known members leads to a total sample of 89 cluster giants with typical uncertainties <=1.0km/s in their radial velocity estimates. The sample covers a wide range of projected distances from the cluster centre, from ~0.2arcmin to 6.5arcmin =~23 half-light radii (r_h_). We find only very weak rotation, as typical of metal-poor globular clusters. ...(more)
Abstract: (hide)
The data have been acquired with the multi-object facility FLAMES@VLT in the combined MEDUSA+UVES mode, allowing the simultaneous allocation of 8 UVES high-resolution fibres and 132 MEDUSA mid-resolution fibres. Two configurations of target stars have been used. A total of four exposures of 46 min each for each configuration has been secured in Service Mode during the period between 2012 April and July. A small overlap between the two configurations (12 stars) has been secured in order to cross-check the stability of the RV when measured with different fibres.

  • J/A+AS/82/71 : Deep photometry of NGC 5694 and Terzan 8 (Ortolani+, 1990)
  • J/MNRAS/435/3667 : Equivalent widths of 6 NGC5694 stars (Mucciarelli+, 2013)
  • J/AJ/135/836 : Calcium triplet index in LMC stars (Carrera+, 2008)

                
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