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astronomy instrumentation 1exoplanet biosignatures 1habitable worlds observatory 1high-contrast imaging 1ultraviolet spectroscopy 1

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20242026
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astro-ph.SR2026

Near UV Stellar Activity and Brightness Fluctuations of the Alpha Centauri AB Star System from Weeks to Decades -- Inputs for Reflected Light Spectroscopy with HWO

Dolon Bhattacharyya, Kevin France, Soumit Rao +6

We present the most comprehensive near-ultraviolet (NUV: 2550-3255 Angstrom) activity record to date for the Alpha Centauri AB system, combining archival IUE and HST observations s…