Stellar yields with rotation and their effect on chemical evolution models
Stellar yields with rotation and their effect on chemical evolution models
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旋转的恒星产量及其对化学演化模型的影响
DOI：
10.1051/0004-6361:20031192
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发表时间：
2003
影响因子：
6.5
通讯作者：
G. Observatory
中科院分区：
文献类型：
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作者：
C. Chiappini;F. Matteucci;Georges Meynet Osservatorio Astronomico di Trieste;D. Astronomia;U. Trieste;G. Observatory
我们计算了银河系（MW）中两组不同恒星产量的不同丰度比的演化。其中之一考虑了恒星旋转，我们研究了它对化学演化模型预测的影响。此外，我们表明某些丰度比是研究晕盘不连续性的重要工具。首次显示晕/厚盘和薄盘阶段之间恒星形成停止的影响，基于 Fe/Ov s 的研究已经表明了这一点。如果 C 主要由低质量和中等质量恒星 (LIMS) 产生，则 O/ Ha 和 Fe/Mg 与 Mg/H 的比较也应该在 C/ O/ Hp 批次中看到。 C 主要源自 LIMS 的想法是由 (C/Fe) 比作为金属丰度函数的平坦行为（从 (Fe=H) 2:2 到太阳）以及最近对 MW 晕和盘中恒星的 C/O 测量似乎显示出围绕 log (O/H)+ 12 8:4 的不连续性这一事实提出的。最后，相对于采用 van den Hoek & Groenewegen (1997) 产量的模型，通过使用 Meynet & Maeder (2002 - 其中包括恒星旋转但不包括热底燃烧) 的中等质量恒星的恒星产量来预测氮丰度随金属丰度 (或时间) 的增加更为温和。这一事实对氮富集的时间尺度有一定的影响，从而对阻尼莱曼阿尔法系统的性质的解释有一定的影响。
We compute the evolution of dierent abundance ratios in the Milky Way (MW) for two dierent sets of stellar yields. In one of them stellar rotation is taken into account and we investigate its eects on the chemical evolution model predictions. Moreover, we show that some abundance ratios oer an important tool to investigate the halo-disk discontinuity. For the first time it is shown that the eect of a halt in the star formation between the halo/thick disk and thin disk phases, already suggested from studies based both on Fe/ Ov s. O/ Ha nd Fe/Mg vs. Mg/H, should also be seen in a C/ Ov ersus O/ Hp lot if C is produced mainly by low- and intermediate-mass stars (LIMS). The idea that C originates mainly from LIMS is suggested by the flat behavior of the (C/Fe) ratio as a function of metallicity, from (Fe=H) 2:2 to solar, and by the fact that very recent C/O measurements for stars in the MW halo and disk seem to show a discontinuity around log (O/H)+ 12 8:4. Finally, a more gentle increase of N abundance with metallicity (or time), relative to models adopting the yields of van den Hoek & Groenewegen (1997), is predicted by using the stellar yields of Meynet & Maeder (2002 - which include stellar rotation but not hot-bottom burning) for intermediate mass stars. This fact has some implications for the timescales of N enrichment and thus for the interpretation of the nature of Damped Lyman Alpha Systems.
九州大学
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