J/A+A/619/A13 28 distant globular clusters CaT metallicities (Vasquez+, 2018)
Homogeneous metallicities and radial velocities for Galactic globular clusters.
II. New CaT metallicities for 28 distant and reddened globular clusters.
Vasquez S., Saviane I., Held E.V., Da Costa G.S., Dias B., Gullieuszik M.,
Barbuy B., Ortolani S., Zoccali M.
<Astron. Astrophys. 619, A13 (2018)>
=2018A&A...619A..13V 2018A&A...619A..13V (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Stars, giant ; Equivalent widths ;
Radial velocities
Keywords: stars: abundances - stars: kinematics and dynamics -
globular clusters: general
Abstract:
In an earlier paper we presented the first part of a project to obtain
metallicities and radial velocities of Galactic globular clusters from
multiobject spectroscopy of their member stars using the ESO Very
Large Telescope. In this paper we add metallicities and radial
velocities for a new sample of 28 globular clusters, including in
particular globular clusters in the MW halo and the Galactic bulge.
Together with our previous results, this study brings the number of
globular clusters with homogeneous measurements to ∼69% of those
listed in the W. Harris' catalogue. As in our previous work, we have
used the CaII triplet lines to derive metallicities and radial
velocities. For most of the clusters in this study, this is the first
analysis based on spectroscopy of individual member stars. The
metallicities derived from the CaII triplet are then compared to the
results of our parallel study based on spectral fitting in the optical
region and the implications for different calibrations of the CaII
triplet line strengths are discussed.
Description:
File table3 contains the names of the observed clusters, the
identifiers of member stars and their coordinates (J2000), the
heliocentric radial velocities with errors, the difference in V mag
from the horizontal branch, and the sum of the equivalent widths of
the CaII triplet lines 8542 and 8662Å, corrected to the zero-point
of our previous work, EW(c). The raw measurements EW(m) with errors
are also provided for reference.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 75 213 Program cluster data
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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- 7 A7 --- Name Cluster name
9- 15 A7 --- Slit Star identification (slit N_NNNNN)
17- 25 F9.5 deg RAdeg Right ascension (J2000)
27- 35 F9.5 deg DEdeg Declination (J2000)
37- 43 F7.2 km/s HRV Heliocentric radial velocity
45- 49 F5.2 km/s e_HRV Error on HRV
51- 55 F5.2 mag dVmag Differential mag from HorizBranch, V-V(HB)
57- 60 F4.2 0.1nm EW(c) Corrected sum of equivalent widths of CaII
triplet lines
62- 65 F4.2 0.1nm e_EW(c) Error on EW(c)
67- 70 F4.2 0.1nm EW(m) Measured sum of equivalent widths of CaII
triplet lines
72- 75 F4.2 0.1nm e_EW(m) Error on EW(m)
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Acknowledgements:
Enrico Held, enrico.held(at)oapd.inaf.it
(End) Patricia Vannier [CDS] 14-Aug-2018