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Titolo:
HST NICMOS photometry of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4
Autore:
Ortolani, S; Barbuy, B; Bica, E; Renzini, A; Zoccalli, M; Rich, RM; Cassisi, S;
Indirizzi:
European So Observ, D-85748 Garching, Germany European So Observ Garching Germany D-85748 v, D-85748 Garching, Germany Univ Padua, Dept Astron, I-35122 Padua, Italy Univ Padua Padua Italy I-35122 Padua, Dept Astron, I-35122 Padua, Italy Univ Sao Paulo, BR-01060970 Sao Paulo, Brazil Univ Sao Paulo Sao Paulo Brazil BR-01060970 BC01060970 Sao Paulo, Brazil Univ Fed Rio Grande Sul, Dept Astron, BR-91501970 Porto Alegre, RS, BrazilUniv Fed Rio Grande Sul Porto Alegre RS Brazil BR-91501970 BC, RS, Brazil Univ Calif Los Angeles, Dept Phys & Astron, Div Astron & Astrophys, Los Angeles, CA 90095 USA Univ Calif Los Angeles Los Angeles CA USA 90095 Los Angeles, CA 90095 USA Osservatorio Astron Collurania, I-64100 Teramo, Italy Osservatorio Astron Collurania Teramo Italy I-64100 -64100 Teramo, Italy
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 376, anno: 2001,
pagine: 878 - 884
SICI:
1432-0746(200109)376:3<878:HNPOTR>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
COLOR-MAGNITUDE DIAGRAMS; SPACE-TELESCOPE NICMOS; METAL-RICH; ABUNDANCE ANALYSIS; GALACTIC BULGE; STARS; OPACITIES; AGES; TRANSFORMATIONS; TEMPERATURE;
Keywords:
Galaxy : globular clusters : individual : NGC 6528, Terzan 5, Liller 1, Terzan 4 UKS 1; stars : CM diagram;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Zoccalli, M European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany European So Observ Karl Schwarzschild Str 2 Garching Germany D-85748
Citazione:
S. Ortolani et al., "HST NICMOS photometry of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4", ASTRON ASTR, 376(3), 2001, pp. 878-884

Abstract

We present results from NICMOS Hubble Space Telescope observations of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4, obtained through the filters F110W (1.1 mum) and F160W (1.6 mum) (nearly equivalent to J and H). For the first time the turnoff region of Liller 1 and the main sequence of Terzan 5 and Terzan 4 are reached, as well asthe horizontal branch of UKS 1. The magnitude difference between the turnoff and the red horizontal branch Deltam(110) = m(110)(HB)- m(110)(TO) is used as an age indicator. From comparisons with new isochrones in the NICMOS photometric system, we conclude that the two metal-rich clusters NGC 6528 and Terzan 5 are coeval within uncertainties (similar to 20%) with 47 Tucanae. Liller 1 and UKS 1 are confirmed as metal-rich globular clusters. Terzan4 is confirmed as an interesting case of a metal-poor cluster in the bulgewith a blue horizontal branch.

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Documento generato il 21/09/20 alle ore 11:24:17