Fig. 4
Chandra X-ray spectra and best-fit models of four bright X-ray sources in S254-258. The crosses show the measured spectra, the solid lines show the best-fit models; in the two cases where a two temperature model was required, the dotted lines show the two individual spectral model components. CXOU J061244.17+175914.0 is the B0.5 star HD 253327 that illuminates the S257 nebula. CXOU J061253.73+175724.7 is the source with the highest derived X-ray luminosity in our sample; it is located in the embedded cluster S255-IR. CXOU 061255.04+175930.7 is another embedded infrared source in S255-IR. CXOU 061312.58+180706.2 is the source with the second highest X-ray luminosity in our sample.
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