Extended Data Fig. 4: Visualization of the quantitative spectral analysis results of BAT99 5.
From: Discovery of a transitional type of evolved massive star with a hard ionizing flux
Observed spectral and photometric data (blue and green) for BAT99 5 over-plotted with the best-fitting atmosphere model (red). The uppermost panel shows the spectral energy distribution while the lower panels compare the normalized observed and model spectrum the UV and optical regime. The UV panel (secondmost upper panel) contains an inlet showing a zoom-in around the C IV 1550 wind line compared to models with different carbon abundance (indicated by different colors and line styles). The presence (or absence) of major spectral lines is indicated by black vertical dashes annotated with the corresponding ion.
