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
中科院分区:
文献类型:
--
作者:
Cohen, David H;Wang, Jiaming;Petit, Véronique;Leutenegger, Maurice A;Dakir, Lamiaa;Mayhue, Chloe;David-Uraz, Alexandre
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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DOI:
10.1086/309710
发表时间:
1995
期刊:
The Astrophysical Journal Letters
影响因子:
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作者:
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DOI:
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影响因子:
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发表时间:
2001
期刊:
The Astrophysical Journal Letters
影响因子:
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作者:
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