Integrated spectral energy distributions and absorption-feature indices of single stellar populations
Integrated spectral energy distributions and absorption-feature indices of single stellar populations
复制标题
DOI：
10.1111/j.1365-2966.2004.07682.x
复制
发表时间：
2004-03
影响因子：
4.8
通讯作者：
Fenghui Zhang;Zhanwen Han;Lifang Li;J. Hurley
中科院分区：
文献类型：
--
作者：
Fenghui Zhang;Zhanwen Han;Lifang Li;J. Hurley
使用进化种群综合，我们提出了由利克天文台图像解剖扫描仪（称为 Lick/IDS）系统定义的集成光谱能量分布和吸收线指数，用于大量瞬时爆发单恒星种群（SSP）。 SSP的年龄范围为1 Gyr小于或等于≤19 Gyr，金属丰度范围为-2.3小于或等于[Fe/H]小于或等于+0.2。我们的模型使用 Hurley、Pols 和 Tout 的快速单恒星演化算法来计算恒星演化轨迹，使用 Lejeune、Cuisinier 和 Buser 的经验和半经验校准 BaSeL-2.0 模型来计算恒星光谱库，使用 Worthey、Faber、Gonzalez 和 Burstein 的经验拟合函数来计算 Lick/IDS 光谱吸收特征指数。将我们合成的 Lick/IDS 吸收线指数应用于评价函数，我们获得了 M32 中心区域的年龄和金属丰度，这可以通过年龄与 6.5 Gyr 相似且金属丰度与太阳相似的瞬时 SSP 很好地解释。将评价函数推导的年龄和金属丰度应用到许多指数-指数图上，我们发现H-β-Fe5015和H-β-Fe5782的图是最好的指数-指数图，从中我们可以直接获得合理的年龄和金属丰度。
Using evolutionary population synthesis, we present integrated spectral energy distributions and absorption-line indices defined by the Lick Observatory image dissector scanner (referred to as Lick/IDS) system, for an extensive set of instantaneous burst single stellar populations (SSPs). The ages of the SSPs are in the range 1 Gyrless than or equal totauless than or equal to19 Gyr and the metallicities are in the range -2.3less than or equal to[Fe/H]less than or equal to+0.2. Our models use the rapid single stellar evolution algorithm of Hurley, Pols and Tout for the stellar evolutionary tracks, the empirical and semi-empirical calibrated BaSeL-2.0 model of Lejeune, Cuisinier and Buser for the library of stellar spectra and the empirical fitting functions of Worthey, Faber, Gonzalez and Burstein for the Lick/IDS spectral absorption-feature indices. Applying our synthetic Lick/IDS absorption-line indices to the merit function, we obtain the age and the metallicity of the central region of M32, which can be well explained by an instantaneous SSP with an age of similar to6.5 Gyr and a metallicity similar to solar. Applying the derived age and the metallicity from the merit function to a number of index-index diagrams, we find that the plots of H-beta-Fe5015 and H-beta-Fe5782 are the best index-index diagrams from which we can directly obtain reasonable age and metallicity.