This is an informational portal about the non-local thermodynamic equilibrium (non-LTE, NLTE) spectral line-formation calculations in stellar atmospheres.

Non-LTE can lead to either stronger or weaker spectral lines compared to LTE depending on the investigated species, atomic parameters of the spectral line, and stellar atmosphere parameters. We compiled the literature data on the departures from LTE based on the original model atoms of different chemical species. This collection is presented in the section Bibliography.

Atomic data for the non-LTE calculations.

For on-line calculation (interpolation in a pre-calculated grid) of the non-LTE abundance correction for a given spectral line and stellar parameters, see spectrum.inasan.ru/nLTE2, nlte.mpia.de, and inspect-stars.com