A study of the role of Lyman {\beta} fluorescence on OI line strengths   in Be stars
  The possibility of the Ly{\beta} fluorescence mechanism being operational in classical Be stars and thereby contributing to the strength of the OI 8446 {\AA} line has been recognized for long. However this supposition needs to be quantified by comparing observed and predicted OI line ratios. In the present work, optical and near-infrared spectra of classical Be stars are presented. We analyse the observed strengths of the OI 7774, 8446, 11287 and 13165 {\AA} lines which have been theoretically proposed as diagnostics for identifying the excitation mechanism. We have considered and examined the effects of Ly{\beta} fluorescence, collisional excitation, recombination and continuum fluorescence on these OI line strengths. From our analysis it appears that the Ly{\beta} fluorescence process is indeed operative in Be stars. 
Blesson Mathew (1), Dipankar P. K. Banerjee (1), Annapurni Subramaniam   (2) and N. M. Ashok (1) ((1) Astronomy and Astrophy...
astro-ph.SR