2023
DOI: 10.3847/1538-4357/acdcf1
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The Advanced Spectral Library: The Evolution of Chromospheric Wind Characteristics from Noncoronal to Hybrid Giant Stars*

Abstract: The Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph treasury program Advanced Spectral Library enables investigations of the characteristics and dynamics of the wind and chromosphere of cool stars using high-quality spectral data. This paper shows how the wind features change with spectral class when transferring across the Linsky–Haisch dividing line by comparing the noncoronal M3.5 giant γ Cru with the K5 hybrid γ Dra. We compare the presence of high-ionization diagnostics in the two object… Show more

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“…However, it is Fe II that is the atomic species with by far the most numerous lines in the E230H spectra, many showing wind absorption (Rau et al 2018;Nielsen et al 2023). In Figure 8(a), we show the 2723-2734 Å spectral region of γ Cru, with four Fe II lines and one Cr II line.…”
Section: The Near-ultraviolet Fe II Linesmentioning
confidence: 98%
“…However, it is Fe II that is the atomic species with by far the most numerous lines in the E230H spectra, many showing wind absorption (Rau et al 2018;Nielsen et al 2023). In Figure 8(a), we show the 2723-2734 Å spectral region of γ Cru, with four Fe II lines and one Cr II line.…”
Section: The Near-ultraviolet Fe II Linesmentioning
confidence: 98%