Figure 1: Hydrogen Balmer spectrum for HFMWDs. In this work, we use Si:P as an analogue of hydrogen in conditions similar to those at the surface of HFMWDs. The measured Lyman series spectra ...

Evans found that the 4686 series and the Pickering series can be obtained in a helium spectrum ... The lines of the new series have wave-lengths very close to the hydrogen lines of the Balmer series.