Maíz Apellániz, J.; Sota, A.
Massive Stars: Fundamental Parameters and Circumstellar Interactions (Eds. P. Benaglia, G. L. Bosch, & C. E. Cappa) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 33, pp. 44-46 (2008)
It has been traditionally stated that it is not possible to use optical/NIR photometry to measure the temperatures of O stars. In this contribution we describe the steps required to overcome the hurdles that have prevented this from happening in the past and we present our preliminary results for the low-extinction case.