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Titolo:
The giant, horizontal, and asymptotic branches of Galactic globular clusters. I. The catalog, photometric observables, and features
Autore:
Ferraro, FR; Messineo, M; Pecci, FF; De Palo, MA; Straniero, O; Chieffi, A; Limongi, M;
Indirizzi:
Osservatorio Astron Bologna, I-40126 Bologna, Italy Osservatorio Astron Bologna Bologna Italy I-40126 I-40126 Bologna, Italy European So Observ, D-85748 Garching, Germany European So Observ Garching Germany D-85748 v, D-85748 Garching, Germany Stazione Astron Cagliara, I-09012 Capoterra, Italy Stazione Astron Cagliara Capoterra Italy I-09012 -09012 Capoterra, Italy Univ Bologna, Dipartimento Astron, I-40126 Bologna, Italy Univ Bologna Bologna Italy I-40126 imento Astron, I-40126 Bologna, Italy Osserv Astron Collurania, I-64100 Teramo, Italy Osserv Astron Collurania Teramo Italy I-64100 nia, I-64100 Teramo, Italy CNR, Ist Astrofis Spaziale, I-00044 Frascati, Italy CNR Frascati Italy I-00044 st Astrofis Spaziale, I-00044 Frascati, Italy Osserv Astron Monte Porzio, I-00040 Monte Porzio Catone, Italy Osserv Astron Monte Porzio Monte Porzio Catone Italy I-00040 tone, Italy
Titolo Testata:
ASTRONOMICAL JOURNAL
fascicolo: 4, volume: 118, anno: 1999,
pagine: 1738 - 1758
SICI:
0004-6256(199910)118:4<1738:TGHAAB>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
COLOR-MAGNITUDE DIAGRAM; THERMONUCLEAR REACTION-RATES; LUMINOSITY FUNCTION BUMP; POST-TURNOFF STARS; EXTREME HALO STARS; BVI CCD PHOTOMETRY; PHOTOGRAPHIC PHOTOMETRY; BLUE STRAGGLERS; MILKY-WAY; CHEMICAL-COMPOSITION;
Keywords:
globular clusters : general; stars : evolution; stars : horizontal-branch; stars : Population II;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
136
Recensione:
Indirizzi per estratti:
Indirizzo: Ferraro, FR Osservatorio Astron Bologna, Via Zamboni 33, I-40126 Bologna, Italy Osservatorio Astron Bologna Via Zamboni 33 Bologna Italy I-40126
Citazione:
F.R. Ferraro et al., "The giant, horizontal, and asymptotic branches of Galactic globular clusters. I. The catalog, photometric observables, and features", ASTRONOM J, 118(4), 1999, pp. 1738-1758

Abstract

A catalog including a set of the most recent color-magnitude diagrams (CMDs) is presented for a sample of 61 Galactic globular clusters (GGCs). We used this database to perform a homogeneous systematic analysis of the evolved sequences (namely, the red giant branch [RGB], horizontal branch [HB], and asymptotic giant branch [AGB]). Based on this analysis, we present (1) a new procedure to measure the level of the zero-age horizontal branch (V-ZAHB) and a homogeneous set of distance moduli obtained by adopting the HE as standard candle; (2) an independent estimate for RGB metallicity indicatorsand new calibrations of these parameters in terms of both spectroscopic ([Fe/H](CG97)) and global metallicity ([M/H], including also the a-element enhancement), such that the set of equations presented can be used to simultaneously derive a photometric estimate of the metal abundance and the reddening from the morphology and the location of the RGB in the (V,B-V) CMD; and(3) the location of the RGB bump tin 47 GGCs) and the AGE bump tin nine GGCs). The dependence of these features on metallicity is discussed. We find that by using the latest theoretical models and the new metallicity scales,the earlier discrepancy between theory and observations (similar to 0.4 mag) completely disappears.

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Documento generato il 04/12/20 alle ore 13:21:43