On the origin of macroturbulence in hot stars

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dc.creatorAerts, C.
dc.creatorPuls, J.
dc.creatorGodart, M.
dc.creatorDupret, M. -A.
dc.date2008-12-14
dc.date.accessioned2026-07-07T12:12:47Z
dc.date.available2026-07-07T12:12:47Z
dc.descriptionSince 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.
dc.descriptionTo appear in a special volume of the journal Communications in Asteroseismology dedicated to the Proceedings of the Liege conference; 6 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0812.2641
dc.identifierhttp://arxiv.org/abs/0812.2641
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/210656
dc.subjectAstrophysics
dc.titleOn the origin of macroturbulence in hot stars
dc.typetext

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