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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.
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