Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...399..287r&link_type=abstract
Astronomy and Astrophysics, v.399, p.287-296 (2003)
Astronomy and Astrophysics
Astrophysics
8
Line: Profiles, Stars: Early-Type, Stars: Mass-Loss, Stars: Individual: Bd +60Deg 2522, Stars: Variables: General
Scientific paper
We report the analysis of a long term observing campaign designed to monitor the spectroscopic variability of the Oef star BD +60deg 2522. We find that the double-peaked He {II} lambda 4686 emission line undergoes strong profile variability on time scales of 2-3 day. However, the time scale as well as the pattern of these variations turn out to be epoch dependent and the phenomenon is thus most likely not ruled by a single stable clock. On the other hand, the absorption lines in the spectrum of BD +60deg 2522 display line profile variability on time scales of a few hours that might be related to non-radial pulsations. We tentatively propose that the beating of several non-radial pulsation modes triggers transient large-scale density perturbations in a confined stellar wind that produce the 2-3 day time scale variability.
Based on observations collected at the Observatoire de Haute Provence, France.
de Becker Martine
Rauw Gregor
Vreux Jean-Marie
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