Hydrodynamical simulations of convection-related stellar micro-variability

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dc.creatorSvensson, F.
dc.creatorLudwig, H. -G.
dc.date2004-09-29
dc.date.accessioned2026-07-07T02:14:48Z
dc.date.available2026-07-07T02:14:48Z
dc.descriptionWe used a series of COBOLD hydrodynamical model atmospheres covering stellar objects from white dwarfs to red giants to derive theoretical estimates of the photometric and photocentric stellar variability in wavelength-integrated light across the Hertzsprung-Russell diagram. We validated our models against solar measurements from the SOHO/VIRGO instrument. Within our set of models we find a systematic increase of the photometric as well as photocentric variability - which turn out to be closely connected - with decreasing surface gravity. The estimated absolute levels of the photocentric variability do not affect astrometric observations on a precision level expected to be achieved by the GAIA mission - with the exception of close-by giants. The case of supergiants remains to be investigated. In view of the ongoing debate about the photometric non-detection of p-modes in Procyon by the Canadian MOST satellite we remark that we obtain a factor of ca. 3 in amplitude between the granular background noise in the Sun and Procyon. This statement refers to a particular representation of temporal power spectra as discussed in Sect. 5.
dc.descriptionProc. 13th Cool Stars Workshop, Hamburg, 5-9 July 2004, F.Favata et al., eds., 5 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0409714
dc.identifierhttp://arxiv.org/abs/astro-ph/0409714
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8261
dc.subjectAstrophysics
dc.titleHydrodynamical simulations of convection-related stellar micro-variability
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