Indeed, both helium and hydrogen atmospheres could fit the data if the emission was dominated by a hot-spot about a quarter of the area of the entire neutron star surface.

In our model of tidal disruption, you are seeing the broad line region being built." More recently, another TDE was detected (PS1-11af), and its spectrum had neither hydrogen nor helium emission ...

LONDON. Royal Society, Jan. 17.—A. S. Eddington: The charge of an electron (see p. 138 of this issue).—R. H. Fowler: The thermionic emission constant A. Nordheim's theory of the emission ...

The emission spectrum of helium. Laser pulses can expose quantum aspects of pairs of helium atoms. Credit: Dept. of Physics, Imperial College/SPL ...