title: High Spatial Resolution Observations of Young Stellar Binaries
creator: Ratzka, Thorsten
subject: ddc-520
subject: 520 Astronomy and allied sciences
description: In the first part of this work a volume-limited multiplicity survey with magnitude cutoff (m_K <= 10.5 mag) of 158 young stellar objects located in the Ophiuchus molecular clouds is presented. All companions in the separation range 0.13 arcsec to 6.4 arcsec with flux ratios >= 0.1 at the diffraction limit could be detected by using speckle techniques. The degree of multiplicity is 29.1%+-4.3% and thus only marginally higher than the value 23.5%+-4.8% derived for the given separation range for the main-sequence solar-like stars in the solar neighbourhood. The implications of these findings will be discussed. Afterwards observations with both speckle-cameras and adaptive optics systems are used to improve our knowledge of the dynamical mass of the two companions of the M-dwarf LHS 1070 located in the solar neighbourhood.    In the third part observations in the mid-infrared with the interferometric instrument MIDI at the VLTI are described. The reduction of the data with the Fourierspectrum analysis is explained and the interpretation of the results is demonstrated for the binary Z CMa and the triple system T Tau. In the case of Z CMa the position angle, the separation, and the relative brightness of the infrared companion could be determined. From the T Tau data the projected separation between the southern components and their flux ratio is derived. Separate spectra of T Tau N and T Tau S that reveal a silicate absorption towards T Tau S and a spatially resolved spectrum of T Tau N are shown.  
date: 2005
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/5516/1/Ratzka.pdf
identifier: DOI:10.11588/heidok.00005516
identifier: urn:nbn:de:bsz:16-opus-55161
identifier:   Ratzka, Thorsten  (2005) High Spatial Resolution Observations of Young Stellar Binaries.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/5516/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng