Seminář ÚTFA: Alžběta Oplištilová

Ústav teoretické fyziky a astrofyziky vás zve na přednášu ústavního semináře:

Alžběta Oplištilová: Models of Del and Eps Ori based on multi-technique observationsModels of Del and Eps Ori based on multi-technique observations

Massive stars are cosmic engines, by exploding as supernovae, they power galaxies, shape the interstellar medium, and enrich it with heavy elements. Yet, their inner workings remain among the most challenging frontiers in stellar astrophysics. The life of massive stars is critically influenced by multiplicity. Most of them have one or more companions, although a few of them remain single.

This raises the question: Could these single stars be the end state of multiple systems? The Orion complex is the only high-mass star-forming region where we can observe all massive stars from one OB association with interferometry. It hosts several massive stars, especially in the Orion OB1 association, including the famous Belt stars. Thus, it is the most suitable region for detailed studies of massive stars using a combination of interferometry, spectroscopy, and photometry.

Using this approach, I modelled two systems: the triple star Delta Orionis and a single supergiant Epsilon Orionis. The analysis indicates that Delta Orionis is a pre-mass-transfer object, and an unusual tertiary indicates a previous mass transfer. The only massive single star in the Orion Belt, Epsilon Orionis, is a fast-rotating oblate star and might represent an evolved state of other stars in the Orion Belt.