Emission line ratios such as [SII] 6731/[OIII] 5007 shift by up to a factor of 470 with distance from an OB star, offering an unresolved-spectroscopy route to identifying externally photoevaporating disks in clusters.
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Line ratio identification of external photoevaporation
Emission line ratios such as [SII] 6731/[OIII] 5007 shift by up to a factor of 470 with distance from an OB star, offering an unresolved-spectroscopy route to identifying externally photoevaporating disks in clusters.