Abstract

Challenges to massive stars theories

Artemio Herrero (Instituto de Astrofisica de Canarias)

M. Garcia (IAC), S.Simon-Diaz (IAC), M.A. Urbaneja (IfA, Hawaii), N. Castro (Obs. Athens), C. Sabin-Sanjulian (IAC)

The theory of stellar structure and evolution, together with the theories of stellar atmospheres, is one of the best established astrophysical theories. Yet, a large number of objects carefully analyzed present problems, either from the point of view of one of the theories or from the consistency between them. In this talk we present some recent results from the IAC group in the Milky Way and nearby galaxies of different metallicities (IC1613, M33, NGC55), where we find objects that challenge our present standard knowledge, either as apparent individual objects (e.g., with winds stronger than expected or abundances that are difficult to explain) , as a coherent stellar group (e.g., the masses of B supergiants) or from the relation to their host clusters (e.g., whether they belong to a given cluster or not). The contribution of the Tarantula-FLAMES collaboration to these issues is also addressed and illustrated with some early results.