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Atlas of high-resolution emission and shell lines in Be stars. Line profiles and short-term variability

1996; EDP Sciences; Volume: 116; Issue: 2 Linguagem: Inglês

10.1051/aas

1286-4846

R. W. Hanuschik, W. Hummel, E. Sutorius, O. Dietle, G. Thimm,

Astronomy and Astrophysical Research

We present an atlas of high-, high-resolution ( km ) data of Be star emission and shell profiles. We have collected profiles of Hα and of Fe ii, mostly of the λ5317 transition. These lines have been selected to provide measures for the overall emission strength and for the velocity field in these disks. We have collected data for 77 southern and equatorial programme stars, covering the period 1982-1993. This is the most comprehensive overview of profile shapes in Be disks. We propose a three-dimensional scheme in which most observed profiles can be classified. The parameters are i) inclination, ii) optical depth, and iii) the pattern of the velocity field. A search for short-term variability (timescales between five days and a few minutes) in six stars ended with negative result. Shortest observed timescale for variability is a few days for well-developed disks in binary systems (HR 1910, HR 2142).