arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1703.09705astro-ph.SR
收藏

风质量损失算法对大质量恒星演化影响的系统研究

A Systematic Survey of the Effects of Wind Mass Loss Algorithms on the Evolution of Single Massive Stars

Mathieu Renzo, Christian D. Ott, Steven N. Shore, Selma E. de Mink

摘要:

质量损失是大质量恒星演化过程中的一个关键不确定因素。恒星演化的计算必须使用质量损失的参数算法,并且通常只包括恒星风。利用开源的恒星演化程序MESA,对风质量损失对大质量恒星演化的影响进行了参数研究。我们提供了一个系统的比较风的质量损失算法的太阳金属丰度,非旋转,单星的初始质量范围内的$15-35\,M_\odot$。我们考虑从两个热相算法,三个冷相算法,和两个沃尔夫-拉叶算法的组合。我们考虑$1$、$0.33$和$0.1$的线性风效率比例因子,以解释由于风的不均匀性而导致的质量损失率的降低。我们发现,初始到最终的质量映射为每个零年龄的主序列(ZAMS)质量有一个$\sim 50\%$的不确定性,如果所有的算法组合和风效率被认为是。特设的效率规模因素主导这种不确定性。虽然我们的模型的最终总质量和内部结构随质量损失处理而变化很大,但最终可观察参数对ZAMS质量$\lesssim 30\,M_\odot$的敏感性要低得多。这表明风质量损失的不确定性不会对爆炸前观测的大多数单星超新星祖先的ZAMS质量产生负面影响。此外,我们表明,超新星爆发前的恒星的内部结构是敏感的主序星和主序星后的质量损失的变化。我们发现,紧凑性参数$ξ\propto M/R(M)$变化多达$30\%$为一个给定的ZAMS质量演变与不同的风效率和质量损失算法组合。[删节]

英文摘要:

Mass loss is a key uncertainty in the evolution of massive stars. Stellar evolution calculations must employ parametric algorithms for mass loss, and usually only include stellar winds. We carry out a parameter study of the effects of wind mass loss on massive star evolution using the open-source stellar evolution code MESA. We provide a systematic comparison of wind mass loss algorithms for solar-metallicity, nonrotating, single stars in the initial mass range of $15-35\,M_\odot$. We consider combinations drawn from two hot phase algorithms, three cool phase algorithms, and two Wolf-Rayet algorithms. We consider linear wind efficiency scale factors of $1$, $0.33$, and $0.1$ to account for reductions in mass loss rates due to wind inhomogeneities. We find that the initial to final mass mapping for each zero-age main-sequence (ZAMS) mass has a $\sim 50\%$ uncertainty if all algorithm combinations and wind efficiencies are considered. The ad-hoc efficiency scale factor dominates this uncertainty. While the final total mass and internal structure of our models vary tremendously with mass loss treatment, final observable parameters are much less sensitive for ZAMS mass $\lesssim 30\,M_\odot$. This indicates that uncertainty in wind mass loss does not negatively affect estimates of the ZAMS mass of most single-star supernova progenitors from pre-explosion observations. Furthermore, we show that the internal structure of presupernova stars is sensitive to variations in both main sequence and post main-sequence mass loss. We find that the compactness parameter $ξ\propto M/R(M)$ varies by as much as $30\%$ for a given ZAMS mass evolved with different wind efficiencies and mass loss algorithm combinations. [abridged]

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑