Stellar evolutionary models for Magellanic Clouds

被引:35
作者
Castellani, V
Degl'Innocenti, S
Marconi, M
Moroni, PGP
Sestito, P
机构
[1] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy
[2] Osserv Astron Roma, I-00040 Monte Porzio Catone, Italy
[3] Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy
[4] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy
[5] Osserv Astron Capodimonte, I-80131 Naples, Italy
[6] Osservatorio Astron Collurania, I-64100 Teramo, Italy
[7] Univ Florence, Dipartimento Astron & Sci Spazio, I-50125 Florence, Italy
关键词
stars : evolution; globular clusters : general; open clusters and associations : general; galaxies : Magellanic Clouds;
D O I
10.1051/0004-6361:20030540
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We supplement current evolutionary computations concerning Magellanic Cloud stars by exploring the evolutionary behavior of canonical stellar models ( i. e., with inefficient core overshooting) with metallicities suitable for stars in the Clouds. After discussing the adequacy of the adopted evolutionary scenario, we present evolutionary sequences as computed following a selected sample of stellar models in the mass range 0 : 8 divided by 8 M . from the Main Sequence till the C ignition or the onset of thermal pulses in the advanced Asymptotic Giant Branch phase. On this basis, cluster isochrones covering the range of ages from similar to 100 Myr to similar to 15 Gyr are presented and discussed. To allow a comparison with evolutionary investigations appeared in the recent literature, we computed additional sets of models which take into account moderate core overshooting during the H burning phase, discussing the comparison in terms of current uncertainties in the stellar evolutionary models. Selected predictions constraining the cluster ages are finally discussed, presenting a calibration of the difference in magnitude between the luminous MS termination and the He burning giants in terms of cluster age. Both evolutionary tracks and isochrones have been made available at the node h t t p : / / g i p s y. c j b. n e t as a first step of a planned " Pisa Evolutionary Library".
引用
收藏
页码:645 / 653
页数:9
相关论文
共 53 条
[1]   A CCD PHOTOMETRIC ANALYSIS OF THE OLD OPEN CLUSTER NGC-2420 [J].
ANTHONYTWAROG, BJ ;
KALUZNY, J ;
SHARA, MM ;
TWAROG, BA .
ASTRONOMICAL JOURNAL, 1990, 99 (05) :1504-1535
[2]  
ASLARIS M, 2003, IN PRESS APJ
[3]  
BERTELLI G, 1985, ASTRON ASTROPHYS, V150, P33
[4]   Testing intermediate-age stellar evolution models with VLT photometry of Large Magellanic Cloud clusters. III. Padova results [J].
Bertelli, G ;
Nasi, E ;
Girardi, L ;
Chiosi, C ;
Zoccali, M ;
Gallart, C .
ASTRONOMICAL JOURNAL, 2003, 125 (02) :770-784
[5]  
BRESSAN A, 1993, ASTRON ASTROPHYS SUP, V100, P647
[6]   Large Magellanic Cloud stellar clusters - I. 21 HST colour magnitude diagrams [J].
Brocato, E ;
Di Carlo, E ;
Menna, G .
ASTRONOMY & ASTROPHYSICS, 2001, 374 (02) :523-U2
[7]  
BROCATO E, 2003, IN PRESS AJ
[8]   Abundances for globular cluster giants .1. Homogeneous metallicities for 24 clusters [J].
Carretta, E ;
Gratton, RG .
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1997, 121 (01) :95-112
[9]   Distances, ages, and epoch of formation of globular clusters [J].
Carretta, E ;
Gratton, RG ;
Clementini, G ;
Pecci, FF .
ASTROPHYSICAL JOURNAL, 2000, 533 (01) :215-235
[10]   An updated theoretical scenario for globular cluster stars [J].
Cassisi, S ;
Castellani, V ;
Degl'Innocenti, S ;
Weiss, A .
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1998, 129 (02) :267-279