Rotation studies of young very low mass stars and brown dwarfs [Elektronische Ressource] / presented by María Victoria Rodríguez-Ledesma

Rotation Studies ofYoung very low Mass Starsand Brown DwarfsMar´ıa Victoria Rodr´ıguez-LedesmaMax-Planck-Institut fur¨ AstronomieHeidelberg 2009Dissertation in Astronomysubmitted to theCombined Faculties for the Natural Sciences and for Mathematicsof the Ruperto-Carola University of Heidelberg, Germany.for the degree ofDoctor of Natural Sciencespresented byDipl.-Phys. Mar´ıa Victoria Rodr´ıguez-Ledesmaborn in Cap. Fed., Buenos Aires, ArgentinaOral examination: 06.07.2009Rotation Studies ofYoung very low Mass Starsand Brown DwarfsReferees: Prof. Dr. Reinhard MundtProf. Dr. Immo AppenzelleriAbstractRotation studies over as large a range of ages and masses as possible are important for constraining theangular momentum evolution of young stellar objects (YSO). Of particular interest are the very low mass(VLM) stars and brown dwarfs (BDs), because of the relatively small number of known rotational periods(P ) in that mass range. This thesis for the first time provides important information on rotationalrotproperties of a large sample of young VLM stars and BDs.The extensive rotational period study of YSOs in the 1 Myr old Orion Nebula Cluster (ONC) presentedhere is based on a deep photometric monitoring campaign. As a result, 487 periodic variables (PVs)were found (377 of which are new) with estimated masses between 0.5-0.015M , 124 of which are BDflcandidates.