Bibcode
Cassatella, A.; Fernandez-Castro, T.; Gonzalez-Riestra, R.; Fuensalida, J. J.
Referencia bibliográfica
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 368-378.
Fecha de publicación:
5
1992
Número de citas
16
Número de citas referidas
15
Descripción
The activity phase of BF Cygni discovered in May 1989 and which lasted
about two years is examined. The UV emission lines, usually strong
during quiescence, were not detectable during the outburst. UV
high-resolution spectra in the outburst indicate the development of an
expanding shell giving rise to a considerable number of violet-shifted
absorption lines, especially from Fe II. Curves of growth analyses and
radial velocity measurements of the Fe II lines indicate a decrease with
time of the electron temperature and of the Fe II column density in the
shell, while the expansion velocities increased. It is suggested that
the activity phase of BF Cygni was triggered by an enhancement of the
mass loss rate from the cool component taking place when the system was
at periastron.