Chandra spectral measurements of the O supergiant ζ Puppis indicate a surprising increase in the wind mass-loss rate over 18 yr

Chandra spectral measurements of the O supergiant ζ Puppis indicate a surprising increase in the wind mass-loss rate over 18 yr
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O 超巨星 ζ Puppis 的钱德拉光谱测量表明,18 年来风质量损失率出现了令人惊讶的增加

DOI:
10.1093/mnras/staa3124
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发表时间:
2020
影响因子:
4.8
通讯作者:
David-Uraz, Alexandre
David-Uraz, Alexandre
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cohen, David H;Wang, Jiaming;Petit, Véronique;Leutenegger, Maurice A;Dakir, Lamiaa;Mayhue, Chloe;David-Uraz, Alexandre

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对O超巨星ζPUP的新的长光栅式观测表明,自钱德拉第一次观测周期以来的18σ年中,X射线发射线通量不仅变亮了13 / ,而且也清楚地证据--重要性超过4σ--其多普勒加宽的线轮廓中的风吸收特征增加了。我们通过对轮廓的非参数分析以及高斯拟合来证明这一点,然后使用线轮廓模型拟合得出质量损失率为2.47g±0.09g×10−6,比从周期1数据获得的值增加了40 / %。对于短波长线路,单个发射线通量的增加比长波长线路更大,如果线路发射的均匀增加伴随着嵌入激波加热等离子体的冷风对波长的依赖吸收的增加,这是可以预期的。
New longChandragrating observations of the O supergiant ζ Pup show not only a brightening of the X-ray emission line flux of 13 per cent in the 18 yr sinceChandra’s first observing cycle, but also clear evidence – at more than 4σ significance – of increased wind absorption signatures in its Doppler-broadened line profiles. We demonstrate this with non-parametric analysis of the profiles as well as Gaussian fitting and then use line-profile model fitting to derive a mass-loss rate of 2.47 ± 0.09 × 10−6, which is a 40 per cent increase over the value obtained from the cycle 1 data. The increase in the individual emission line fluxes is greater for short-wavelength lines than long-wavelength lines, as would be expected if a uniform increase in line emission is accompanied by an increase in the wavelength-dependent absorption by the cold wind in which the shock-heated plasma is embedded.
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