Figure 2 from The Secret Lives of Cepheids: δ Cep—The Prototype of a New Class of Pulsating X-Ray Variable Stars

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The Secret Lives of Cepheids: δ Cep—The Prototype of a New Class of Pulsating X-Ray Variable Stars

Authors: Scott G. Engle, Edward F. Guinan, Graham M. Harper, Manfred Cuntz, Nancy Remage Evans, Hilding R. Neilson, and Diaa E. Fawzy

2017 The Astrophysical Journal 838 67.

Provider: AAS Journals

Caption: Figure 2.

X-ray energy distributions for the 2015 Chandra observation of δ Cep are shown, along with model-derived plasma temperatures, X-ray fluxes, and luminosities. For both models (plotted as dashed lines), a neutral hydrogen (﹩{N}_{{\rm{H}}}﹩) column density value of ﹩3.5\times {10}^{20}﹩ cm⁻² (﹩\mathrm{log}\,{N}_{{\rm{H}}}=20.5﹩) was adopted (Engle et al. 2014).

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