Massive stars in NGC 604: an HST/NICMOS+ACS perspective

Barbá, R. H.; Maíz Apellániz, J.; Pérez, E.; Rubio, M.; Bolatto, A. D.; Fariña, C.; Bosch, G.; Walborn, N. R.
XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 35, pp. 50-51 (2009)


This is a report in advance of an in-depth analysis of the extragalactic giant H 0 region NGC 604 in M33. This object is the prototypical scale OB association and its properties (massive stellar content, young, and low foreground extinction) make it an ideal object to a detailed analysis. Here, we present the very early results of new Hubble Space Telescope observations obtained with the NICMOS Camera 2 and the Advanced Camera for Surveys (ACS), namely: (a) the discovery of four new red supergiant star candidates which are closely (parsec-scale) associated to known Wolf-Rayet stars; (b) the discovery of a large population of young stellar objects associated to the previously known molecular cores and regions with high extinction, some of them being high luminosity objects.