Radial velocities of giant stars: an investigation of line profile variations

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dc.creatorHekker, S.
dc.creatorSnellen, I. A. G.
dc.creatorAerts, C.
dc.creatorQuirrenbach, A.
dc.creatorReffert, S.
dc.creatorMitchell, D. S.
dc.date2007-10-22
dc.date.accessioned2026-07-07T11:53:44Z
dc.date.available2026-07-07T11:53:44Z
dc.descriptionSince 1999, a radial velocity survey of 179 red giant stars is ongoing at Lick Observatory with a one month cadence. At present ~20-100 measurements have been collected per star with an accuracy of 5 to 8 m/s. Of the stars monitored, 145 (80%) show radial velocity (RV) variations at a level >20 m/s, of which 43 exhibit significant periodicities. Here, we investigate the mechanism causing the observed radial velocity variations. Firstly, we search for a correlation between the radial velocity amplitude and an intrinsic parameter of the star, in this case surface gravity (log g). Secondly, we investigate line profile variations and compare these with theoretical predictions.
dc.descriptionTo appear in the proceedings of the Helas II workshop: Helioseismology, Asteroseismology and MHD Connections; published in the Journal of Physics: Conference Series, ed. L. Gizon; 7 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/0710.4134
dc.identifierhttp://arxiv.org/abs/0710.4134
dc.identifierJ.Phys.Conf.Ser.118:012058,2008
dc.identifierdoi:10.1088/1742-6596/118/1/012058
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204646
dc.subjectAstrophysics
dc.titleRadial velocities of giant stars: an investigation of line profile variations
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