2011A&A...535A.121C


Query : 2011A&A...535A.121C

2011A&A...535A.121C - Astronomy and Astrophysics, volume 535A, 121-121 (2011/11-1)

A Stroemgren view of the multiple populations in globular clusters.

CARRETTA E., BRAGAGLIA A., GRATTON R., D'ORAZI V. and LUCATELLO S.

Abstract (from CDS):

We discuss a variety of photometric indices assembled from the uvby Stroemgren system. Our aim is to examine the pros and cons of the various indices to find the most suitable one(s) for studying the properties of multiple populations in the globular clusters (GCs) discovered by spectroscopy. We explore in particular the capabilities of indices like m1 and cy at different metallicities. We define a new index δ4=(u-v)-(b-y) to separate first and second stellar generations in GCs of any metal abundance, since it keeps the sensitivity to multiple stellar populations over the full metallicity range and at the same time minimizes the sensitivity to photometric errors. We detect clear differences in the red giant branches of the GCs examined, such as skewness or bi/multimodality in color distribution. We connect the photometric information with the spectroscopic results on the O and Na abundances we obtained in our survey of GCs. Finally, we compute the effects of different chemical composition on the Stroemgren filters and indices using synthetic spectra.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: Population II - globular clusters: general

Simbad objects: 12

goto Full paper

goto View the references in ADS

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 - 2022
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3723 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 984 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1012 0
4 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1330 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3231 0
6 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1758 0
7 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2099 0
8 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1997 0
9 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1876 1
10 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1295 0
11 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1894 0
12 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1072 0

To bookmark this query, right click on this link: simbad:objects in 2011A&A...535A.121C and select 'bookmark this link' or equivalent in the popup menu


2022.05.24-11:41:38

© Université de Strasbourg/CNRS

    • Contact