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Magnetism in Massive Stars

Henrichs, H. F.

Stars with mass more than 8 solar masses end their lives as neutron stars, which we mostly observe as highly magnetized objects. Where does this magnetic field come from? Such a field could be formed during the collapse, or is a (modified) remnant of a fossil field since the birth of the star, or otherwise generated by a dynamo during its lifetime…

The complex structure of the Mg II regions of 40 BeV stars

Danezis, E.; Lyratzi, E.; Theodossiou, E. +4 more

In this paper we present a study of the UV Mg II resonance lines in 40 BeV stars' spectra. We used the model proposed by Danezis et al. (2002, 2003). This model is based on the idea of independent density layers in the regions where the spectral lines that present SACs (DACs) are created. We calculated the apparent rotation (V_rot) and e…

Analysis of the Mg II h spectral line shapes in HR 7275 and IM Peg.

Popović, L. Č.; Jankov, S.; Djurašević, G. +3 more

The analysis of high-resolution IUE spectra of the RS CVn type stars HR 7275 and IM Peg is presented. The inverse method technique was applied to the Mg II h chromospheric emission line, that shows the presence of interstellar absorption, in order to recover the intrinsic stellar line profile parameters.