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• W3035004319 abstract "New long Chandra grating observations of the O supergiant $zeta$ Pup show not only a brightening of the x-ray emission line flux of 13 per cent in the 18 years since Chandra's first observing cycle, but also clear evidence - at more than four sigma significance - of increased wind absorption signatures in its Doppler-broadened x-ray emission line profiles. We demonstrate this with non-parametric analysis of the profiles as well as Gaussian fitting and then use the line-profile model fitting to derive a mass-loss rate of $2.47 pm 0.09 times 10^{-6}$ Msun/yr, 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." @default.
• W3035004319 created "2020-06-19" @default.
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• W3035004319 date "2020-10-10" @default.
• W3035004319 modified "2023-09-30" @default.
• W3035004319 title "<i>Chandra</i> spectral measurements of the O supergiant ζ Puppis indicate a surprising increase in the wind mass-loss rate over 18 yr" @default.
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• W3035004319 doi "https://doi.org/10.1093/mnras/staa3124" @default.
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