Stellar formation in interstellar bubbles around massive stars

M.C. MARTIN, G. A. ROMERO , C. CAPPA

Praga, Rep. Checa

Simposio; Simposio 237: Triggered star formation in a turbulent ISM; 2006

IAU

Stellar formation may be induced in the compressed and dense  regions around the ionized bubbles. Among the processes proposed for the onset of stellar formation, the "collect and collapse" process (Elmegreen & Lada 1977) may work in these neutral structures. Observational evidence of this process includes the presence of dense and neutral gas layers surrounding the ionized regions and high density clumps within the neutral shells. To investigate if stellar forming processes are going on in the outer neutral shells of interstellar bubbles, we analyzed the correlation of the observed neutral gas structures with stellar formation indicators. The selected regions are the neutral gas structures associated with Anon(WR,23), RCW,52, G307.27+0.27,  and RCW,78 (Cappa et al. 2005a,2005b, Mart´{i}n et al. 2007) linked to  WR,23 (WC6), LSS,1887 (O8V), S,221 (O6), and WR,55 (WN7), respectively.