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SUMMARY:What transients can teach us about common envelope evolution? - Na
 dejda Blagorodnova
DTSTART:20191009T121500Z
DTEND:20191009T124500Z
UID:TALK130354@talks.cam.ac.uk
CONTACT:Catrina Diener
DESCRIPTION:Most stars in our Universe live in binaries. Unstable mass tra
 nsfer from one star to another can lead to the formation of a common envel
 ope: a shared gaseous shell where both stars orbit. The end of this phase 
 is marked by the quick spiral-in of the secondary star towards its compani
 on\, leading to violent interactions between the components. The whole\, o
 r part of the binary's common envelope may get ejected\, and the binary ma
 y even completely merge. This last phase has been observed as astrophysica
 l transients called luminous red novae (LRNe)\, allowing us to study the p
 rogenitor stars\, the energetics of the outburst and the properties of the
  ejected material. In my talk I In my talk\, I will provide an overview of
  LRNe progenitor systems and their main formation scenarios\, as explored 
 by recent theoretical models. In particular\, I will present the results o
 f our photometric and spectroscopic follow-up campaign for one well studie
 d LRN in M31\, where several mass loss episodes can be clearly identified.
LOCATION:Sackler Lecture Theatre\, IoA
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