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| Paper: |
Common Envelope: The Progress and the Pitfalls |
| Volume: |
447, Evolution of Compact Binaries |
| Page: |
91 |
| Authors: |
Ivanova, N. |
| Abstract: |
The common envelope event is one of the most important and uncertain evolutionary stages
that lead to formation of compact binaries.
While the problem is almost 30 years old, its theoretical foundation did not progress much
from the first proposed consideration.
For many years, the simple estimate provided by αλ-formalism has been
intensively used by population synthesis studies and, not surprisingly, frequently
contradicted observations.
In recent years, the advancements in our studies of stellar structure, progress of the numerical techniques
for hydrodynamical simulations as well as increase of the computer power and new observations started
to bring improvements to our understanding of the common envelope phase.
We review main physical processes taking place during the common envelope phase
from the theoretical point of view and how they affect the values of classical formal parameters.
In particular, we discuss the energy budget problem
– what are the energy sources, sinks
and what is the condition for the envelope to disperse,
as well as the importance of choosing the definition of the remnant core to the common envelope outcome. |
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