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Titolo:
ISOCHRONES FOR HYDROGEN-BURNING GLOBULAR-CLUSTER STARS .3. FROM THE SUN TO THE GLOBULAR-CLUSTERS
Autore:
STRANIERO O; CHIEFFI A; LIMONGI M;
Indirizzi:
OSSERVATORIO ASTRON COLLURANIA I-64100 TERAMO ITALY CNR,IST ASTROFIS SPAZIALE I-00044 FRASCATI ITALY OSSERV ASTRON ROMA I-00040 MONTE PORZIO CATO ITALY
Titolo Testata:
The Astrophysical journal
fascicolo: 1, volume: 490, anno: 1997,
parte:, 1
pagine: 425 - 436
SICI:
0004-637X(1997)490:1<425:IFHGS.>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
P-MODE FREQUENCIES; THERMONUCLEAR REACTION-RATES; STANDARD SOLAR MODELS; HELIUM-DIFFUSION; ELEMENT DIFFUSION; COMPOSITION GRADIENTS; LITHIUM ABUNDANCE; STELLAR MODELS; OPAL EQUATION; METALLICITY;
Keywords:
DIFFUSION; GLOBULAR CLUSTERS, GENERAL; STARS, EVOLUTION; STARS, INTERIORS; STARS, LOW MASS, BROWN DWARFS; SUN, INTERIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
63
Recensione:
Indirizzi per estratti:
Citazione:
O. Straniero et al., "ISOCHRONES FOR HYDROGEN-BURNING GLOBULAR-CLUSTER STARS .3. FROM THE SUN TO THE GLOBULAR-CLUSTERS", The Astrophysical journal, 490(1), 1997, pp. 425-436

Abstract

By comparing the available seismic data for the Sun with the properties of various standard solar models, we can check the reliability of the input physics used to produce low-mass stellar models. The best reproduction of the solar interior is obtained when (1) Coulomb corrections are applied to the EOS, (2) microscopic diffusion of He and heavy elements is taken into account, and (3) internal rotation is neglected. This physics is used to derive new models for H-burning low-mass stars (from the zero-age main sequence to the red giant branch tip) and for central He-burning stars (zero-age horizontal branch models). Isochrones for Galactic globular clusters based on these new models are thenpresented. Note that since the first paper of this series, we have been systematically using an EOS including Coulomb corrections obtained by means of an accurate Monte Carlo method. When microscopic diffusionis also taken into account, we find that: (1) ages inferred from the turnoff luminosity are reduced by about 10%-15%. In particular, the larger the age and the metallicity, the larger the reduction. (2) Microscopic diffusion has a negligible effect on the horizontal-branch luminosity. (3) As a consequence of points (1) and (2), and at variance with previous findings, the ages inferred by adopting the so-called DeltaV-TO(HB) method depend on diffusion. (4) Finally, ages inferred from Delta(B-V) are strongly reduced (up to 40%-50%).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 13:10:57