title: Modeling the formation of massive stars
creator: Kuiper, Rolf Gerd
subject: ddc-520
subject: 520 Astronomy and allied sciences
description: I investigate the radiation pressure problem in the formation of massive stars using a newly developed frequency  dependent radiation transport module for three-dimensional hydrodynamics simulations. The nature of the  radiative impact depending on the morphology of the stellar environment is examined in one-, two-, and three-  dimensional monolithic collapse calculations of massive pre-stellar cores. Contrary to previous research, a  highly superior frequency dependent stellar feedback is considered, the vicinity of the forming star is resolved  down to 1.27 AU, and the evolution is computed for a factor of ten longer. For the first time a broad survey of the  parameter space is possible. The simulations demonstrate the need of including the dust condensation front to  compute the radiative feedback correctly. Earlier calculations, which ignore these physics, lead to an artificial truncation of the accretion phase. The most fundamental result is that the formation of a massive accretion  disk in slowly rotating cores bypasses the radiative flux through the optically thin atmosphere, enabling steady  accretion. A revealed close-by gravitational instability in the disk drives a sufficiently high accretion rate to  overcome the residual stellar radiation feedback. This mechanisms allow the star to grow far beyond any limit  found in earlier calculations.
date: 2009
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/10201/1/UB.pdf
identifier: DOI:10.11588/heidok.00010201
identifier: urn:nbn:de:bsz:16-opus-102015
identifier:   Kuiper, Rolf Gerd  (2009) Modeling the formation of massive stars.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/10201/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng