| |
 |
| Paper: |
Rotational Properties of Single and Wide Binary Subdwarf B Stars |
| Volume: |
452, Fifth Meeting on Hot Subdwarf Stars and Related Objects |
| Page: |
81 |
| Authors: |
Geier, S.; Heber, U.; Edelmann, H.; Napiwotzki, R.; Morales-Rueda, L. |
| Abstract: |
We measured projected rotational velocities of more than a hundred apparently single sdBs. A comparison is made with sdB stars in binary systems with orbits so wide, that tidal interaction becomes negligible. All of these stars are slow rotators (vrot sin i < 10 km s–1) with EC 22081–1916 being the only exception. This single star has the highest projected rotational velocity ever measured for an sdB (vrot sin i = 163 km s–1) and might have been formed by a merger event. The merger of a red-giant core and a low-mass, main-sequence star or substellar object during a common envelope phase fits particularly well with observations. The implications of our results for hot subdwarf formation are briefly discussed. |
|
|
|
|
|
