Interaction of massive stars with their surroundings

Abstract

Abstract. Due to their short lifetimes but their enormous energy release in all stages of their lives massive stars are the major engines for the comic matter circuit. They affect not only their close environment but are also responsible to drive mass flows on galactic scales. Recent 2D models of radiation-driven and wind-blown Hii regions are summarized which explore the impact of massive stars to the interstellar medium but find surprisingly small energy transfer efficiencies while an observable Carbon self-enrichment in the Wolf-Rayet phase is detected in the warm ionized gas. Finally, the focus is set on state-of-the-art modelling of Hii regions and its present weaknesses with respect to uncertainties and simplifications but on a perspective of the requested art of their modelling in the 21 st century.

Comparing the spatial and kinematic distribution of gas and young stars around the shell-like structure in the CMa OB1 association

“…The interplay between supernova (SN) events and the star-forming molecular cloud is of key relevance to the star formation process, as shown in several examples from the literature. In particular, it has been proposed that SN are able to affect star formation negatively by suppressing the formation of new stars in their surroundings, as well as positively by triggering it (see review by Hensler et al 2011). In the latter case, the expansion of SN remnant (SNR) shells can sweep up the surrounding gas up to the point of triggering sequential star formation (according to the "collect and collapse" model of Elmegreen & Lada 1977).…”