Astron. Astrophys. 342, 756-762 (1999)

4. Results of calculations

In Table 1 we give the equivalent widths W of selected N ii lines calculated in the NLTE approximation, as well as - values found under LTE approach. Measured equivalent widths in  Peg spectrum are also given in Table 1.

Calculations were performed for temperature and gravity that are close to  Peg atmosphere parameters: and , (Gies & Lambert [1992] give the following parameters: and ), with microturbulent velocity . Adopted absolute nitrogen abundance was . Calculated line profiles were convolved using (Slettebak et al. (1975) give for ). A comparison of the calculated and observed profiles is given in Fig. 1a-f. From this figure and from Table 1 one can conclude that calculated profiles and equivalent widths of N ii lines agree very well with the observational data.

Fig. 1a-f. Calculated (NLTE) and observed in  Peg spectrum profiles of selected N ii lines. Synthetic spectrum - solid line, observed - dots.

© European Southern Observatory (ESO) 1999

Online publication: February 23, 1999
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