| |
 |
| Paper: |
Wind Roche-Lobe Overflow: A New Mass Transfer Mode for Mira-type Binaries |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
355 |
| Authors: |
Mohamed, S.; Podsiadlowski, Ph. |
| Abstract: |
We investigate mass transfer in binaries
consisting of a mass-losing Mira variable and an accreting
compact companion. Although these systems are
generally assumed to interact via Bondi-Hoyle-Littleton (BHL)
wind accretion, this mechanism cannot adequately explain the
observations of the nearest and best-studied symbiotic binary,
Mira. We propose a new mass-transfer mode,
“wind Roche-Lobe Overflow” (wind RLOF), which we demonstrate
with 3-D numerical hydrodynamic simulations. We show that this
mode occurs when the wind acceleration zone lies close to, or
is a significant fraction of, the Roche-lobe radius. The
circumstellar outflows which result tend to be highly aspherical
and strongly focused towards the binary orbital plane. The
mass-transfer rates are also at least an order of magnitude
greater than the analogous BHL values. We discuss the implications
of these results for symbiotic binaries and other related systems,
e.g. barium stars, bipolar planetary nebulae, and Ia supernovae. |
|
|
|
|
|
