Simulations of magnetoconvection in cool main-sequence stars

Beeck, Benjamin

dc.contributor.advisor	Reiners, Ansgar Prof. Dr.
dc.contributor.author	Beeck, Benjamin
dc.date.accessioned	2014-05-26T08:24:52Z
dc.date.available	2014-05-26T08:24:52Z
dc.date.issued	2014-05-26
dc.identifier.uri	http://hdl.handle.net/11858/00-1735-0000-0022-5EC8-D
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-4493
dc.language.iso	eng	de
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/
dc.subject.ddc	530	de
dc.title	Simulations of magnetoconvection in cool main-sequence stars	de
dc.type	doctoralThesis	de
dc.contributor.referee	Reiners, Ansgar Prof. Dr.
dc.date.examination	2014-02-14
dc.subject.gok	Physik (PPN621336750)	de
dc.description.abstracteng	In this thesis, the magnetoconvective processes in the nearsurface layers of cool main-sequence stars were studied in 24 three-dimensional local “box-in-a-star” simulations. For each of six sets of stellar parameters corresponding to spectral types F3V –M2V including the solar case (G2V), one non-magnetic and three magnetic simulations with an initially vertical and homogeneous field of 20, 100, and 500G were performed. A granule segmentation and tracking algorithm was developed and the granulation was analysed for the non-magnetic and some magnetic runs. For a few wavelength passbands, the centre-tolimb variation of the intensity and its rms contrast were calculated on the basis of snapshots from the simulations. Synthetic spectral line profiles were calculated for the simulated stars. A discintegration including differential rotation was carried out in order to study the effects of the three-dimensional atmospheric structure on spectral line profiles. The simulations presented in this thesis are an essential step towards a physically comprehensive description of magnetoconvective processes in stars, which is needed, e. g. for the improvement of inversion methods and the correct interpretation of spectroscopic observations.	de
dc.contributor.coReferee	Schüssler, Manfred Prof. Dr.
dc.contributor.thirdReferee	Stein, Robert F. Prof. Dr.
dc.subject.eng	astrophysics	de
dc.subject.eng	stellar physics	de
dc.subject.eng	magnetic fields	de
dc.subject.eng	convection	de
dc.subject.eng	hydrodynamcs	de
dc.subject.eng	magnetohydrodynamics	de
dc.subject.eng	turbulence	de
dc.subject.eng	cool stars	de
dc.subject.eng	main-sequence stars	de
dc.subject.eng	magnetic activity	de
dc.identifier.urn	urn:nbn:de:gbv:7-11858/00-1735-0000-0022-5EC8-D-0
dc.affiliation.institute	Fakultät für Physik	de
dc.identifier.ppn	786482281