SIMBAD references

This paper presents a study of the wavelength region 9840 - 10200 centered upon P 7 in 74 Be type stars (B0-A0). We find a correlation of the P 7 emission with spectral type, the emission being strongest in early types and disappearing toward A0. All emission lines are double peaked. Besides P 7 also several Fe II lines appear in emission, the strongest being λ 9997. A strong positive correlation exists between all emissions and we conclude that Fe II is in emission whenever P 7 is in emission. P 7 and λ 9997 also show a strong similarity in the details of the line structure. By comparison to stellar radii, the radii of emission-line regions are small and are similar for P 7 and the Fe II emission lines.