| |
 |
| Paper: |
A Population Synthesis Study of the MS+WD Population in the SDSS |
| Volume: |
493, 19th European Workshop on White Dwarfs |
| Page: |
361 |
| Authors: |
García–Berro, E.; Torres, S.; Camacho, J.; Rebassa–Mansergas, A.; Gänsicke, B. T.; Schreiber, M. R.; Zorotovic, M. |
| Abstract: |
Detached white dwarf + main sequence (WD+MS) systems represent the
simplest population of post-common envelope binaries (PCEBs), and
their ensemble properties carry important information about
common-envelope phase. However, most population synthesis studies do
not fully consider the effects of the observational selection biases
of the samples used to compare with the theoretical simulations. We
present a set of detailed Monte Carlo simulations of the population of
WD+MS binaries in the Sloan Digital Sky Survey (SDSS) Data Release 7,
which allows us to make a sound comparison with the available observed
data. We find that our simulations correctly reproduce the properties
of the observed distribution of WD+MS PCEBs. This includes the
distribution of orbital periods and of masses of the white dwarf and
main sequence stars. These distributions can be correctly reproduced
for several choices of the free parameters, although models in which
≤ 10% of the internal energy is used to eject the common
envelope, and in which a small common envelope efficiency ≤ 0.3
seem to fit the observational data better. We also find that systems
with He-core white dwarfs are over-represented in the observed sample,
because of selection effects. |
|
|
|
|
|
