|
|||||
|
|
The orbital period distribution of subdwarf-B binaries |
|
| Authors: | Luisa Morales-Rueda Pierre FL Maxted Tom R Marsh |
| Institution: | 1. Department of Physics and Astronomy, University of Southampton, Southampton, S017 1BJ, UK 2. Astrophysics Group, School of Chemistry & Physics, Keele University, Staffordshire, ST5 5BG, UK 3. Department of Physics, Warwick University, Coventry, CV4 7AL, UK |
| Abstract: | We present the results of a 3.5 year long campaign to measure orbital periods of subdwarf-B (sdB) star binaries. We directly compare our observed orbital period distribution with that predicted by using binary population synthesis. Up to now, most of our systems seem to have been formed through two of the formation channels discussed by Han et al. (2003, MNRAS 341, p. 669), i.e. the first and the second common envelope ejection (CE) channels. At this point, thanks to the long baseline of our observations, we are starting to detect also very long orbital period systems. These have probably come from a complete different formation path, the first stable Roche Lobe overflow (RLOF) channel in which the first mass transfer phase is stable. This channel is expected to lead to the formation of very wide binaries with typical orbital periods ranging from 1 month to 1 year. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |