Calibrated stellar models for metal-poor populations

被引:45
作者
Cariulo, P
Degl'Innocenti, S
Castellani, V
机构
[1] Univ Pisa, Dipartimento Fis, I-56126 Pisa, Italy
[2] Ist Nazl Fis Nucl, Sez Pisa, I-56126 Pisa, Italy
[3] Osserv Astron Roma, I-00040 Monte Porzio Catone, Italy
[4] Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy
关键词
stars : evolution; globular clusters : general; open clusters and associations : general;
D O I
10.1051/0004-6361:20040145
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We extend to lower metallicities recent evolutionary computations devoted to Magellanic Clouds stars, presenting and discussing new stellar models with Z = 0.0002, 0.0004, 0.0006, 0.001 and suitable assumptions about the original He content. As in the previous paper, evolutionary results are compared with observational data to properly calibrate the assumptions about the efficiency of the surface convection. On this basis, we follow the evolution of stellar models in the mass range 0.6 to 11 M-. from the Main Sequence (MS) to the C ignition or the onset of thermal pulses in the advanced Asymptotic Giant Branch (AGB) phase, presenting cluster isochrones covering the range of ages from 20 Myr to 20 Gyr. Selected predictions constraining the cluster ages are discussed, presenting a calibration of the difference in magnitude between the luminous MS termination and the He burning giants in terms of the cluster age. Both evolutionary tracks and isochrones are available at the URL http://astro.df.unipi.it/SAA/PEL/ZO.html*.
引用
收藏
页码:1121 / 1130
页数:10
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