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J/ApJ/791/101    Terzan 5 chemical and kinematical properties   (Massari+, 2014)

Chemical and kinematical properties of Galactic bulge stars surrounding the stellar system Terzan 5. Massari D., Mucciarelli A., Ferraro F.R., Origlia L., Rich R.M., Lanzoni B., Dalessandro E., Ibata R., Lovisi L., Bellazzini M., Reitzel D. <Astrophys. J., 791, 101 (2014)> =2014ApJ...791..101M (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, globular ; Abundances, [Fe/H] ; Effective temperatures Keywords: Galaxy: bulge - stars: abundances - techniques: radial velocities - techniques: spectroscopic Abstract: As part of a study aimed at determining the kinematical and chemical properties of Terzan 5, we present the first characterization of the bulge stars surrounding this puzzling stellar system. We observed 615 targets located well beyond the tidal radius of Terzan 5 and found that their radial velocity distribution is well described by a Gaussian function peaked at <vrad> = +21.0±4.6 km/s with dispersion σv= 113.0±2.7 km/s. This is one of the few high-precision spectroscopic surveys of radial velocities for a large sample of bulge stars in such a low and positive latitude environment (b = +1.7°). We found no evidence of the peak at <vrad> ∼ +200 km/s found in Nidever et al. (2012ApJ...755L..25N). Strong contamination of many observed spectra by TiO bands prevented us from deriving the iron abundance for the entire spectroscopic sample, introducing a selection bias. The metallicity distribution was finally derived for a subsample of 112 stars in a magnitude range where the effect of the selection bias is negligible. The distribution is quite broad and roughly peaked at solar metallicity ([Fe/H] ≃ +0.05 dex) with a similar number of stars in the super-solar and in the sub-solar ranges. The population number ratios in different metallicity ranges agree well with those observed in other low-latitude bulge fields, suggesting (1) the possible presence of a plateau for|b| < 4° in the ratio between stars in the super-solar (0 < [Fe/H] <0.5 dex) and sub-solar (-0.5 < [Fe/H] <0 dex) metallicity ranges; (2) a severe drop in the metal-poor component ([Fe/H] ←0.5) as a function of Galactic latitude. Description: This study is based on a sample of 1608 stars within a radius of 800'' from the center of Terzan 5 (αJ2000=17h:48m:4.85s, δJ2000=-24°:46':44.6''; see Ferraro et al. 2009Natur.462..483F; Lanzoni et al. 2010ApJ...717..653L). While the overall survey will be described in a forthcoming paper (F. Ferraro et al., in preparation), in this work we focus on a subsample of stars representative of the field population surrounding Terzan 5. Given the value of the tidal radius of the system (rt ∼ 300''; Lanzoni et al. 2010ApJ...717..653L; Miocchi et al. 2013ApJ...774..151M), we conservatively selected as genuine field population members all the targets more distant than 400'' from the center of Terzan 5. This subsample is composed of 615 stars belonging to two different data sets obtained with FLAMES (Pasquini et al. 2002Msngr.110....1P) at the ESO VLT and with DEIMOS (Faber et al. 2003SPIE.4841.1657F) at the Keck II Telescope. Each target has been selected from the ESO-Wide Field Imager (WFI) optical catalog described in Lanzoni et al. (2010ApJ...717..653L), along the brightest portion of the red giant branch (RGB), with magnitudes brighter than I<18.5. Objects: ---------------------------------------------------------- RA (ICRS) DE Designation(s) ---------------------------------------------------------- 17 48 05.00 -24 46 48.0 Terzan 5 = GCl 76.1 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 59 284 Identification number, coordinates, atmospheric parameters, iron abundances and their uncertainties for the Terzan 5 field stars in our sample
See also: J/ApJ/699/66 : Abundances in two Galactic bulge stars (Cohen+, 2009) J/A+A/534/A91 : Galactic Bulge Valinhos Observatory Catalog (Teixeira+, 2011) J/A+A/580/A121 : CaT/[Fe/H] calibration for Galactic bulge stars (Vasquez+, 2015) J/A+A/587/A124 : Metal-poor stars towards the Galactic bulge (Koch+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 I8 --- ID Star Identifier (NNNNNNN) 10- 20 F11.7 deg RAdeg Right Ascension in decimal degrees (J2000) 22- 32 F11.7 deg DEdeg Declination in decimal degrees (J2000) 34- 37 I4 K Teff Effective temperature 39- 41 F3.1 [cm/s2] log(g) Log surface gravity 43- 47 F5.2 [-] [Fe/H] Metallicity 49- 52 F4.2 [-] e_[Fe/H] The 1σ uncertainty in [Fe/H] 54- 59 A6 --- Data Data set origin (FLAMES, DEIMOS)
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 29-Mar-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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