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| Paper: |
The White Dwarf Mass Distributions of PCEB with Different αCE Values |
| Volume: |
469, 18th European White Dwarf Workshop (EUROWD12) |
| Page: |
95 |
| Authors: |
Irawati, P.; Mahasena, P.; Herdiwijaya, D.; Herdiwijaya, D. |
| Abstract: |
We report the preliminary results of our population synthesis study
for post common-envelope binaries (PCEBs) with a detailed evolutionary
process using the STARS code. We concentrate our effort in reproducing
the white dwarf mass distribution, and comparing it with the recent
observational data from the Sloan Digital Sky Survey Data Release 7
for WDMS binaries. We employ the Monte Carlo method to choose the initial
parameters of the progenitors (primary mass, mass ratio and orbital period),
then we follow the evolution from the zero age main sequence to the end of
the common-envelope phase. We include approximate post-Helium flash evolution
for primary masses less than 2.0 M☉. We study the effect of
using different common envelope ejection efficiency values on the white dwarf
mass distribution. In particular, we adopt constant αCE values of
0.25, 0.50, and 0.75. The distributions resulting from our population
synthesis show a double-peak profile, except for the smallest αCE value.
We find that smaller efficiency values significantly affect the post-CE
systems with low-mass white dwarf. |
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