Stellar wind yields of very massive stars
Stellar wind yields of very massive stars
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大质量恒星产生的恒星风
DOI：
10.1093/mnras/stad2537
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发表时间：
2023
影响因子：
4.8
通讯作者：
Sabhahit, Gautham N.
中科院分区：
文献类型：
--
作者：
Higgins, Erin R.;Vink, Jorick S.;Hirschi, Raphael;Laird, Alison M.;Sabhahit, Gautham N.
质量最大的恒星为年轻的星系团和星系提供了一个重要的再生物质来源。虽然超大质量恒星（VMSs，M>100）与O型恒星相比相对罕见，但它们从核心H燃烧开始就已经失去了不成比例的大量质量。VMS具有光学厚风，与光学薄的标准O星风相比，质量损失率升高。我们计算风产量和喷射质量的主要序列，我们比较增强的质量损失率标准的。我们从梅萨恒星演化模型中计算了50-500范围内的太阳金属丰度风产额，包括92种同位素的大型核网络，不仅研究了HOC循环，而且还研究了Ne-Na和Mg-Al循环。与标准风相比，具有增强风的VMS在主序上喷射出5-10倍的H处理元素（N，Ne，Na，Al），可能会对球状星团中观察到的C-N和Na-O关系产生影响。我们发现，对于VMS，95%的总风力发电量是在主序列上产生的，而只有1.5%是由后主序列提供的。这意味着，VMS与增强风是26铝的主要来源，对比经典的沃尔夫-拉叶风已被认为是负责银河26铝富集以前的作品。最后，200颗恒星在风中喷射出的每种重元素是50颗恒星的100倍，即使用IMF加权，它们的风贡献仍然比50颗恒星高一个数量级。
The most massive stars provide an essential source of recycled material for young clusters and galaxies. While very massive stars (VMSs, M>100) are relatively rare compared to O stars, they lose disproportionately large amounts of mass already from the onset of core H-burning. VMS have optically thick winds with elevated mass-loss rates in comparison to optically thin standard O-star winds. We compute wind yields and ejected masses on the main sequence, and we compare enhanced mass-loss rates to standard ones. We calculate solar metallicity wind yields from MESA stellar evolution models in the range 50–500, including a large nuclear network of 92 isotopes, investigating not only the CNO-cycle, but also the Ne–Na and Mg–Al cycles. VMS with enhanced winds eject 5–10 times more H-processed elements (N, Ne, Na, Al) on the main sequence in comparison to standard winds, with possible consequences for observed anticorrelations, such as C–N and Na–O, in globular clusters. We find that for VMS 95 per cent of the total wind yields is produced on the main sequence, while only ∼ 5 per cent is supplied by the post-main sequence. This implies that VMS with enhanced winds are the primary source of26Al, contrasting previous works where classical Wolf–Rayet winds had been suggested to be responsible for galactic26Al enrichment. Finally, 200stars eject 100 times more of each heavy element in their winds than 50stars, and even when weighted by an IMF their wind contribution is still an order of magnitude higher than that of 50stars.