Hot stars and cosmic abundances
Hot stars and cosmic abundances
复制标题
炽热的恒星和宇宙的丰富性
DOI：
10.1051/eas/1363002
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
K. Butler
中科院分区：
文献类型：
--
作者：
N. Przybilla;M. Nieva;A. Irrgang;K. Butler
炽热的大质量恒星是当今宇宙丰度的理想指标。我们回顾了Nieva & Przybilla（2012）对太阳附近早期B型恒星的较大样本的非LTE研究结果，并扩展了分析。利用具有改进的微观物理学、新颖的分析方法和高质量光谱的综合模型，研究表明，目前距离太阳几百秒差距的大质量恒星的化学成分是高度均匀的。大约有十几种在天体物理学上具有重要意义的化学元素的丰度被提出，包括铝、硫和氩的新的初步数据。这建立了一个宇宙丰度标准，作为一个参考，促进其他恒星的化学特性被识别。太阳能标准的相似性和差异，以及影响进行了讨论。
Hot massive stars are ideal indicators for present-day cosmic abundances. We review results from a non-LTE study of a larger sample of early B-type stars in the solar neighbourhood by Nieva & Przybilla (2012) and extend the analysis. Using comprehensive models with improved microphysics, novel analysis methodologies and high-quality spectra it is shown that the present-day chemical composition in massive stars out to several hundred parsec distance from the Sun is highly homogeneous. Abundances for about a dozen astrophysically important chemical elements are presented, including new preliminary data on aluminium, sulphur and argon. This establishes a cosmic abundance standard, which serves as a reference facilitating chemical peculiarities in other stars to be identified. Similarities and differences to the solar standard, and implications are discussed.