SN 1987A's anomalous oxygen line ratios are best explained by foreground hot halo gas absorption, which raises its inferred oxygen abundance by about 20%.
V., Beiersdorfer, P., Liedahl, D
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Unusual X-ray Oxygen Line Ratios of SN 1987A Arising From the Absorption of Galactic Hot Interstellar Medium
SN 1987A's anomalous oxygen line ratios are best explained by foreground hot halo gas absorption, which raises its inferred oxygen abundance by about 20%.