{"id":70,"date":"2021-06-11T11:38:40","date_gmt":"2021-06-11T09:38:40","guid":{"rendered":"https:\/\/stel.asu.cas.cz\/en\/?page_id=70"},"modified":"2026-01-27T17:57:30","modified_gmt":"2026-01-27T16:57:30","slug":"hotstars","status":"publish","type":"page","link":"https:\/\/stel.asu.cas.cz\/en\/hotstars\/","title":{"rendered":"Physics of Hot Stars"},"content":{"rendered":"\n
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The cluster R136 within the Tarantula Nebula (30 Doradus) in the Large Magellanic Cloud contains many of the most massive and luminous stars known. Credit: NASA, ESA.<\/figcaption><\/figure>\n\n\n\n


<\/strong>The research of this group, led by Michaela Kraus<\/a>, can be characterised by its dominant focus on studies of massive hot stars. In particular, the long-term, almost exclusive focus on Be- and shell stars in binary systems has been successfully extended to studies of hot massive stars in their different evolutionary stages, which now represent the main research topics of the group. The research includes studies of luminous, hot, massive B\u2011 and O\u2011type stars, as well as massive stars in transition phases, i.e., Wolf-Rayet (WR) stars, Luminous Blue Variables (LBVs), Blue Supergiants (BSGs), B[e] Supergiants (B[e]SGs), Yellow Hypergiants (YHGs), and Red Supergiants (RSGs). The objects studied can be either single or in binary or multiple systems. The group is also involved in observational and theoretical studies of the chemistry and dynamics of the circumstellar material of evolved massive stars. <\/p>\n\n\n\n

Theoretical studies in the modelling of stellar atmospheres, with a natural focus on hot massive stars, are also part of the group’s research. These studies include full NLTE (i.e. without the assumption of local thermodynamic equilibrium) model atmospheres as well as NLTE models of stellar winds.<\/p>\n\n\n\n

Research topics of the group: stellar atmospheres, stellar winds and their modelling; massive stars in short-lived transition phases.<\/p>\n\n\n\n

Members of the group<\/h4>\n\n\n\n