Results are presented from rapid spectrophotometric observations of the Be stars HR 7403 and HR 8762. The observations were conducted between November, 1984 and December, 1985. No ultrarapid variations were detected in the spectra of the stars, with the exception of a few flare-like events. For HR 7403, a flare-like event was recorded only at H-alpha. For HR 8762, two events were obtained from H-alpha photometric observations. The time-scales of the events were a few minutes. The total energies from the events were of the order between 10 to the 34th and 10 to the 37th ergs.
Babu, G. S. D; Shylaja, B. S(D. Reidel Publishing Company, 1982-01)
Based on the observed energy distribution curves of about a hundred Ap stars, the various relationships among their physical parameters: namely, the temperatue, colour index, bolometric correction and bolometric magnitude ...
The H α profile in the spectrum of δ Orionis shows phase-dependent changes, with a period of variation equal to the orbital period fo the binary system. The profile shape changes from a normal absorption profile at zero ...
Mallik, D. C. V(Astronomical Society of Australia, 1991)
The review describes some of the progress made in observations and their interpretation, particularly in the context of the evolution of the nebulae and the central stars. It includes a discussion on the improved determinations ...
