SIMBAD references

This paper deals with the calculation of line widths and lineshapes of the lower Rydberg lines of atomic hydrogen (n∼5-20) in the conditions of stellar envelopes and atmospheres - electron densities scaling from 10⁹ to 10¹⁶cm^–3 and temperatures varying between 5000 and 40000K. For these lines, the traditional semi-classical method breaks down, especially at low densities. Another or other theoretical approaches are needed for the determination of linewidths. An alternative tool is proposed in terms of collision rate methods. Data are provided for n_α, n_β and n_γ lines.