On the origin of macroturbulence in hot stars

Details On the origin of macroturbulence in hot stars On the origin of macroturbulence in hot stars

2008-12-14

arxiv.org/abs/0812.2641v1

Astronomy and Astrophysics

Astrophysics

To appear in a special volume of the journal Communications in Asteroseismology dedicated to the Proceedings of the Liege conf

Scientific paper

Since the use of high-resolution high signal-to-noise spectroscopy in the study of massive stars, it became clear that an ad-hoc velocity field at the stellar surface, termed macroturbulence, is needed to bring the observed shape of spectral lines into agreement with observations. We seek a physical explanation of this unknown broadening mechanism. We interprete the missing line broadening in terms of collective pulsational velocity broadening due to non-radial gravity-mode oscillations. We also point out that the rotational velocity can be seriously underestimated whenever the line profiles are fitted assuming a Gaussian macroturbulent velocity rather than an appropriate pulsational velocity expression.

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