The thermonuclear production of $mathsf{^{19}}$F by Wolf-Rayet stars revisited
The thermonuclear production of $mathsf{^{19}}$F by Wolf-Rayet stars revisited
复制标题
重温沃尔夫-拉叶星 $mathsf{^{19}}$F 的热核产生
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
G. Meynet
中科院分区：
文献类型：
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作者：
Ana Palacios;Marcel Arnould;G. Meynet
计算了初始质量在25~120M0之间的自转星和非自转星的新模型.金属丰度Z=0.004、0.008、0.020和0.040，目的是重新研究Wolf-Rayet(WR)星对星际介质19F丰度的风贡献。结果表明，初始自转速度v i=30 0 km的S-1模型比非自转模型的整体抛射量少19 F。我们将我们的新预测与Meynet&Arnoud(2000，A&A，355,176)的结果进行了比较，结果表明，19F产额对仍不确定的19F(α，ρ)22Ne率和所采用的质量损失率非常敏感。使用考虑了WR风的聚集和珍珠层反应率的推荐质量损失率值，如果可用，我们得到的WR19F产额明显低于Meynet&Arnould(2000，A&A，355,176)的预测，这将使WR星对银河系19F预算不是重要的贡献。然而，考虑到巨大的核损失率和质量损失率的不确定性，我们认为WR对银河系19F的贡献仍然是相当悬而未决的问题。
New models of rotating and non-rotating stars are computed for initial masses between 25 and 120 M ○. and for metallicities Z = 0.004, 0.008, 0.020, and 0.040 with the aim of reexamining the wind contribution of Wolf-Rayet (WR) stars to the 19 F enrichment of the interstellar medium. Models with an initial rotation velocity v i = 300 km s -1 are found to globally eject less 19 F than the non-rotating models. We compare our new predictions with those of Meynet & Arnould (2000, A&A, 355, 176), and demonstrate that the 19 F yields are very sensitive to the still uncertain 19 F(α, ρ) 22 Ne rate and to the adopted mass loss rates. Using the recommended mass loss rate values that take into account the clumping of the WR wind and the NACRE reaction rates, when available, we obtain WR 19 F yields that are significantly lower than predicted by Meynet & Arnould (2000, A&A, 355, 176) and that would make WR stars non-important contributors to the galactic 19 F budget. In view, however, of the large nuclear and mass loss rate uncertainties, we consider that the question of the WR contribution to the galactic 19 F remains quite open.