2017A&A...603A..37G


Query : 2017A&A...603A..37G

2017A&A...603A..37G - Astronomy and Astrophysics, volume 603A, 37-37 (2017/7-1)

First evidence of multiple populations along the AGB from Stromgren photometry.

GRUYTERS P., CASAGRANDE L., MILONE A.P., HODGKIN S.T., SERENELLI A. and FELTZING S.

Abstract (from CDS):

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 Stromgrem 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 Stromgren photometry is also very efficient at identifying multiple populations along the AGB, and demonstrate that the AGB of M 3, M 92, NGC 362, NGC 1851, and NGC 6752 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 NGC 6752 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.

Abstract Copyright: © ESO, 2017

Journal keyword(s): Hertzsprung-Russell and C-M diagrams - stars: abundances - techniques: photometric - globular clusters: general - globular clusters: general

VizieR on-line data: <Available at CDS (J/A+A/603/A37): tableb1.dat tableb2.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3781 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1031 0
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1361 0
4 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1364 0
5 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2406 0
6 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1906 0
7 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1784 0
8 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 579 0
9 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2027 0
10 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 376 0
11 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 1927 0
12 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 984 1

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2023.01.31-08:43:43

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