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J/A+A/603/A37       4 globular clusters RGB and AGB stars      (Gruyters+, 2017)

First evidence of multiple populations along the AGB from Stromgren photometry. Gruyters P., Casagrande L., Milone A.P., Hodgkin S.T., Serenelli A., Feltzing S. <Astron. Astrophys. 603, A37 (2017)> =2017A&A...603A..37G (SIMBAD/NED BibCode)
ADC_Keywords: Positional data ; Clusters, globular ; Models, atmosphere ; Photometry, uvby Keywords: Hertzsprung-Russell and C-Mdiagrams - stars: abundance - techniques: photometry - globular clusters: general Abstract: Spectroscopic studies have demonstrated that nearly all Galactic globular clusters (GCs) harbour multiple stellar populations with different chemical compositions. Moreover, colour-magnitude diagrams based exclusively on Stroemgrem photometry have allowed us to identify and characterise multiple populations along the RGB of a large number of clusters. In this paper we show for the first time that Stroemgren photometry is also very efficient at identifying multiple populations along the AGB, and demonstrate that the AGB of M3, M92, NGC362, NGC1851, and NGC6752 are not consistent with a single stellar population. We also provide a catalogue of RGB and AGB stars photometrically identified in these clusters for further spectroscopic follow-up studies. We combined photometry and elemental abundances from the literature for RGB and AGB stars in NGC6752 where the presence of multiple populations along the AGB has been widely debated. We find that, while the MS, SGB, and RGB host three stellar populations with different helium and light element abundances, only two populations of AGB stars are present in the cluster. These results are consistent with standard evolutionary theory. Description: Coordinates and Stromgren photometry is given for RGB and AGB stars in four Globular clusters. Photometry for NGC362, NGC1851 and NGC6341 is taken from the Grundahl catalogue (see Calamida et al. 2007ApJ...670..400C). Ra and dec were derived for these stars by crossmatching to 2MASS. Coordinates and Stromgren uvby photometry for 117 RGB and 22 AGB stars in M3 were derived as part of the SAGA survey (see Casagrande et al., 2014, Cat. J/ApJ/787/110). PSF photometric measurements were derived using the method and the computer programs by Anderson & King (2006acs..rept....1A) and Anderson et al. (2006A&A...454.1029A) adapted to the INT/WFC camera. This data is part of the SAGA survey (see Casagrande et al., 2014, Cat. J/ApJ/787/110). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tableb1.dat 49 320 Positions and y-mag of RGB and AGB stars in the Grundahl data of NGC362, NGC1851 and NGC6341 tableb2.dat 62 139 Position and uvby photometry of RGB and AGB stars in the globular cluster M3
See also: J/ApJ/787/110 : SAGA: Stromgren survey of seismic KIC stars (Casagrande+, 2014) Byte-by-byte Description of file: tableb1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Cluster Globular Cluster ID 9- 14 I6 --- Star Star ID, within the cluster 16- 26 F11.7 deg RAdeg Right ascension (J2000) 28- 38 F11.7 deg DEdeg Declination (J2000) 40- 45 F6.3 mag ymag Stromgren y magnitude 47- 49 A3 --- Phase Evolutionary phase (AGB or RGB)
Byte-by-byte Description of file: tableb2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- ID Star ID 12- 22 F11.7 deg RAdeg Right ascension (J2000) 24- 34 F11.7 deg DEdeg Declination (J2000) 36- 41 F6.3 mag umag Stromgren u magnitude 43- 48 F6.3 mag vmag Stromgren v magnitude 50- 55 F6.3 mag bmag Stromgren b magnitude 57- 62 F6.3 mag ymag Stromgren y magnitude
Acknowledgements: Pieter Gruyters, pieter.gruyters(at)gmail.com
(End) Pieter Gruyters [LU, Sweden], Patricia Vannier [CDS] 27-Apr-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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