High-resolution X-ray spectra in arbitrary flux units of different SSS (Super soft Sources), CN (Classical Novae) and RN (Recurrent Novae). Left column: SSe. Right column: SSa. Blue thin lines are absorbed blackbody curves, indicating the presence of photospheric emission in all cases.
Comparison plot of grating spectra: Examples of the SSa class : Comparison of high-resolution X-ray spectra of the two CN e KT Eri and V4743 Sgr. X axis: entire wavelength range. Y axis: X-ray spectra flux. Prominent bound-bound transitions are marked with vertical lines at their rest wavelengths, and a label on top of each line gives the corresponding element/ion descriptor.
Examples of the SSe class: Comparison of high-resolution X-ray spectra of Usco (RN) and of the prototype SSS Cal 87, scaled by a factor 10 in brightness.
Examples of intermediate cases: Comparison of high-resolution X-ray spectra of the CN e V5116 Sgr, HVCet, and V1494 Aql. The wavelengths of important transitions are marked and labelled. Lines found in other nova spectra in absorption but without having been identified are included with their wavelength values.