TY  - GEN
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/13462/
N2  - Herbig Ae/Be stars are intermediate-mass (2-10 solar masses) pre-main-sequence stars and they are the most massive stars with a pre-main-sequence phase. They are the higher-mass counterparts to the T Tauri stars, hence fill the parameter space between TTSs and high-mass young stars in addressing the question of star formation as a function of mass. In the first part of this work, the characterization of three Herbig Ae/Be stars using several high-resolution observation methods is presented. Besides the determination of various stellar parameters, unique discoveries were made for each object. HD 144432 was discovered to be a hierarchical triple system. The rotation period of HD 135344B is found to be only 3.9 h. It is so short that this star is rotating at or close to the break-up velocity. Around the four million years young Herbig star HD 142527, a massive planet with a semi-major axis of only 0.6 AU was discovered using high-resolution optical and near-infrared spectroscopy. In the second part of this work, a new observation mode at VLTI is presented. The mid-infrared interferometric instrument MIDI is used with a near-infrared beam-combiner, called PRIMA FSU-A. The latter one enables the correction for changes in the optical path difference caused by Earths atmosphere in real time. Therefore, the interferometric signal on MIDI is highly stabilized and results in a significant increase of its sensitivity. The setup, the data reduction process with first results, and requirements for the final implementation are presented and described. 
A1  - Müller, André
AV  - public
ID  - heidok13462
KW  - Herbig Ae/Be stars 
KW  -  interferometry
Y1  - 2012///
TI  - Characterization of Herbig Ae/Be stars and PRIMA FSU-A as a fringe tracker for MIDI
ER  -