Espectros Multi-Onda de las Estrellas Mas Masivas

Abstract

The systematic trends and relationships among normal OB spectra in the optical, ultraviolet, and X-ray domains are reviewed. The last of these are a recent surprise to many specialists, which establish important constraints on the physical origin of the X-ray emission. Some peculiar categories are also described, including CNO anomalies at the earliest spectral type, O2; the Onfp rapid rotators, a growing class in the Magellanic Clouds that are interesting candidates for stellar mergers and/or gamma-ray burst progenitors; and the Of?p stars, one of which has recently become only the second O star with a detected magnetic field. It is essential to recognize and isolate the peculiar objects in the study of the normal systematics, which they otherwise obstruct and confuse.

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