HST Observations of HD 166620 and τ Ceti: First UV Spectra of a Magnetic Grand Minimum Star and the Extent of τ Ceti’s Astrosphere
Brian E. Wood et al 2026 ApJ 998 113 The star HD 166620 is experiencing a magnetic activity lull similar to the Sun’s Maunder minimum; its Lyman-alpha surface flux is about a factor of two lower than…
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