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Arxiv: JWST/MIRI detection of [Ne V], [Ne VI], and [O IV] wind emission in the O9V star 10 Lacertae Published: 10/7/2024 11:03:52 PM Updated: 11/11/2024 6:05:31 PM

Paper abstract: We report the detection of broad, flat-topped emission in the fine-structurelines of [Ne V], [Ne VI], and [O IV] in mid-infrared spectra of the O9 V star10 Lacertae obtained with JWST/MIRI. Optically thin emission in these high ionstraces a hot, low-density component of the wind. The observed line fluxes implya mass-loss rate of > 3 x 10^8 Msun/yr, which is an order of magnitude largerthan previous estimates based on UV and optical diagnostics. The presence ofthis hot component reconciles measured values of the mass-loss rate withtheoretical predictions, and appears to solve the "weak wind" problem for theparticular case of 10 Lac.