Detailed spectroscopic analysis of the Trapezium cluster stars inside the Orion nebula. Rotational v

  title={Detailed spectroscopic analysis of the Trapezium cluster stars inside the Orion nebula. Rotational v},
  author={Sergio Sim{\'o}n-D{\'i}az and Artemio Herrero and C{\'e}sar Esteban and F. Kneer Instituto de Astrofisica de Canarias and Isaac Newton Group and Departamento de Astrof'isica de la Universidad de La Laguna and Instituto de Estructura de la Materia Csic},
  journal={Astronomy and Astrophysics},
We present the results of a spectroscopic analysis of the Trapezium cluster stars inside the Orion Nebula. The rotational velocities have been obtained using Fourier analysis method, finding agreement with values derived from the usual method, based on linewidth measurements. The rotational velocity derived for theta 1 Ori C through this method is consistent with the variability of some of its spectral features that have a period of 15.42 days. By means of the fit of H, HeI and HeII observed… 
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