- Nombre : CONSTRAINING THE EVOLUTION OF YOUNG STAR CLUSTERS
- Número/Código : G/2011A/009
- Nombre Concurso : CONCURSO PROPUESTAS DE OBSERVACIÓN ASTRONÓMICA PARA TIEMPO CHILENO EN EL OBSERVATORIO GEMINI SUR 2011A
- Año Concurso : 2011
- Tiempo asignado : 8.7 HORAS
Observations show that young star clusters lose a significant fraction of their initial content of massive stars owing to dynamical processes in their dense cores. The ejected (runaway) stars generate bow shocks, whose geometry allows us to back-trace the orbits of the stars to parent clusters. Search for bow shocks in star-forming regions and subsequent identification of their associated stars serve as a useful tool for constraining the dynamical evolution of their parent clusters, and particularly for distinguishing between the primordial and the dynamical origins of mass segregation in star clusters. In the current project, we propose spectroscopic follow-up of nine bow shock-producing stars, detected around the young clusters NGC 3603 and Trumpler 16 using the Spitzer Space Telescope archival data. With the spectroscopic data, we will be able to determine the spectral types, luminosities and masses of the stars, to measure their radial velocities and thereby to determine their cluster membership. Together with the proper motion measurements for our program stars, the results of the spectroscopic follow-up will provide novel constraints on the modeling of young star clusters, which in turn would have profound consequences for understanding the origin of the field OB stars.