JWST/MIRI Detection of [Ne v], [Ne vi], and [O iv] Wind Emission in the O9 V Star 10 Lacertae,The Astrophysical Journal Letters

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JWST/MIRI Detection of [Ne v], [Ne vi], and [O iv] Wind Emission in the O9 V Star 10 Lacertae
The Astrophysical Journal Letters ( IF 8.8 ) Pub Date : 2024-11-27 , DOI: 10.3847/2041-8213/ad91a6
David R. Law, Calum Hawcroft, Linda J. Smith, Alexander W. Fullerton, Christopher J. Evans, Karl D. Gordon, Nimisha Kumari, Claus Leitherer

We report the detection of broad, flat-topped emission in the fine-structure lines of [Ne v], [Ne vi], and [O iv] in mid-infrared spectra of the O9 V star 10 Lacertae obtained with James Webb Space Telescope/Mid-Infrared Instrument. Optically thin emission in these high ions traces a hot, low-density component of the wind. The observed line fluxes imply a mass-loss rate of >3 × 10⁻⁸ M_⊙ yr⁻¹, which is 1 order of magnitude larger than previous estimates based on UV and optical diagnostics. The presence of this hot component reconciles measured values of the mass-loss rate with theoretical predictions and appears to solve the “weak wind” problem for the particular case of 10 Lac.

更新日期：2024-11-27

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