Star formation in dwarf irregular galaxies: DDO 210 and NGC 3109
Star formation in dwarf irregular galaxies: DDO 210 and NGC 3109
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矮不规则星系中的恒星形成：DDO 210 和 NGC 3109
DOI：
10.1086/116481
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
P. Focardi
中科院分区：
文献类型：
--
作者：
L. Greggio;G. Marconi;M. Tosi;P. Focardi
文I[Tosi等人，AJ，102,951(1991)]中提出的研究附近不规则星形成历史的方法被应用于星系DDO 210和NGC 3109。为此，我们获得了DDO210的两个区域和NGC3109的三个区域的深度ccd测光，达到了V≃24，所需的精度为σv≤0.1mag。根据观测的色星等图和光度函数与基于恒星演化轨迹的数值模拟程序生成的相应合成图和光度函数的比较，得到了过去1年这些区域的恒星群、恒星形成率和初始质量函数的主要信息
The method proposed in Paper I [Tosi et al., AJ, 102, 951 (1991)] to study the star formation histories in nearby irregulars is here applied to the galaxies DDO 210 and NGC 3109. To this purpose we have obtained deep CCD photometry of two regions in DDO 210 and three regions in NGC 3109, reaching V ≃ 24 with the required accuracy of σ v ≤ 0.1 mag. Major information on the stellar populations, star formation rates, and initial mass functions of these regions in the last 1 Gyr are derived from the comparison of the observational color-magnitude diagrams and luminosity functions, with the corresponding synthetic diagrams and luminosity functions generated by a numerical simulation code based on stellar evolutionary tracks