Research Division Seminar
Supergiants with an Interesting Past
Exciting things may have happened sometimes to the stars we see in the sky today. For example, Betelgeuse, also known as Alpha-Ori, an M-type red supergiant, the 10th brightest sky in the sky (usually), may well have been a binary star in the past. Its rapid rotation, peculiarly large Galactic velocity, and unusual chemical abundances all point to it being kicked out from the birth environment and merging as a binary star. By comparing a Monte-Carlo stellar cluster population model with the observed populations of Galactic O- and B- type stars (progenitors of red supergiants), I will show that the story of Betelgeuse is not at all uncommon. In distant galaxies, closely related scenarios may give rise to peculiar core-collapse supernovae. I will conclude by briefly discussing how the diversity of such binary and triple stellar evolution histories reflects in the variety of the currently discovered core-collapse supernovae.
About the talk
Technion University, Israel
supernovae, supergiants, stellar rotation, stellar populations, stellar kinematics, stellar kinematics, stellar evolution, massive stars, high-mass stars, Hertzsprung-Russell diagram, binary evolution, binaries, stellar dynamics, science
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About the speaker
Dr. Alexey Bobrick recently received his PhD in astrophysics from Lund University in Sweden. He did his masters in theoretical physics in Minsk and is currently a postdoctoral ERC fellow in the Hagai Perets group in Israel. Alexey works on interactions in giant and compact binary stars at various evolutionary stages.