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J/A+A/607/A44       FLAMES observations of NGC6535           (Bragaglia+, 2017)

NGC 6535: the lowest mass Milky Way globular cluster with a Na-O anti-correlation? Cluster mass and age in the multiple population context. Bragaglia A., Carretta E., D'Orazi V., Sollima A., Donati P., Gratton R.G., Lucatello S. <Astron. Astrophys. 607, A44 (2017)> =2017A&A...607A..44B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Abundances ; Spectroscopy Keywords: stars: abundances - stars: atmospheres - stars: Population II - open clusters and associations: individual: NGC 6535 - globular clusters: general Abstract: To understand globular clusters (GCs) we need to comprehend how their formation process was able to produce their abundance distribution of light elements. In particular, we need to figure out which stars imprinted the peculiar chemical signature of GCs. One of the best way is to study the light-element anti-correlations in a large sample of GCs, analysed homogeneously. As part of our spectroscopic survey of GCs with FLAMES, we present here the results of our study of about 30 red giant member stars in the low-mass, low-metallicity Milky Way cluster NGC 6535. We measured its metallicity (finding [Fe/H]=-1.95, rms=0.04dex in our homogeneous scale) and other elements, in particular we concentrate here on O and Na abundances. These elements define the normal Na-O anti-correlation of classical GCs, making NGC 6535 perhaps the lowest mass cluster with confirmed presence of multiple populations. We updated the census of Galactic and extragalactic GCs for which a statement on the presence or absence of multiple populations can be made on the basis of high-resolution spectroscopy preferentially, or photometry and low-resolution spectroscopy otherwise, discussing the importance of mass and age of the clusters. Description: We used FLAMES@VLT spectra of 45 stars in the globular cluster NGC 6535 to measure radial velocity and infer cluster membership, to derive atmospheric parameters and abundances (in particular of the light elements O and Na). We find a O-Na anticorrelation, as normal for a GC. We also compile a list of clusters known to host (or not) multiple populations on the basis of their chemistry. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 91 45 Basic information on observed stars
See also: J/AJ/121/916 : HST obs. of NGC 2298, 5897, 6535, and 6626 (Testa+, 2001) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- ID Star ID (from Testa et al., 2001, Cat. J/AJ/121/916) 9 A1 --- Instr UVES (U) or GIRAFFE (G) spectrum acquired 11- 12 I2 h RAh Right ascension (J2000.0) 14- 15 I2 min RAm Right ascension (J2000.0) 17- 21 F5.2 s RAs Right ascension (J2000.0) 23 A1 --- DE- Declination sign (J2000.0) 24- 25 I2 deg DEd Declination (J2000.0) 27- 28 I2 arcmin DEm Declination (J2000.0) 30- 34 F5.2 arcsec DEs Declination (J2000.0) 36- 41 F6.3 mag Vmag V magnitude 43- 47 F5.3 mag V-I (V-I) colour index 49- 54 F6.3 mag Ksmag ?=0 2MASS Ks magnitude 56- 61 F6.2 km/s HRV Heliocentric radial velocity 63- 66 F4.2 km/s e_HRV Error on HRV 68- 70 A3 --- Memb Membership flag (M/NM?/NM) 72- 87 A16 --- 2MASS 2MASS identification 89- 91 A3 --- q_2MASS 2MASS quality flag for JHK
Acknowledgements: Angela Bragaglia, angela.bragaglia(at)
(End) Patricia Vannier [CDS] 02-Aug-2017
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