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We report the results of a new survey of massive, OB stars throughout theCarina Nebula using the X-ray point source catalog provided by the ChandraCarina Complex Project (CCCP) in conjunction with infrared (IR) photometry fromthe Two Micron All-Sky Survey and the Spitzer Space Telescope Vela--Carinasurvey. Mid-IR photometry is relatively unaffected by extinction, hence itprovides strong constraints on the luminosities of OB stars, assuming thattheir association with the Carina Nebula, and hence their distance, isconfirmed. We fit model stellar atmospheres to the optical (UBV) and IRspectral energy distributions (SEDs) of 182 OB stars with known spectral typesand measure the bolometric luminosity and extinction for each star. We findthat the extinction law measured toward the OB stars has two components:Av=1--1.5 mag produced by foreground dust with a ratio of total-to-selectiveabsorption Rv=3.1 plus a contribution from local dust with Rv>4.0 in the Carinamolecular clouds that increases as Av increases. Using X-ray emission as astrong indicator of association with Carina, we identify 94 candidate OB starswith Lbol\geq10^4 Lsun by fitting their IR SEDs. If the candidate OB stars areeventually confirmed by follow-up spectroscopic observations, the number ofcataloged OB stars in the Carina Nebula will increase by ~50%. Correcting forincompleteness due to OB stars falling below the Lbol cutoff or the CCCPdetection limit, these results potentially double the size of the young massivestellar population.

Candidate X-ray-Emitting OB Stars in the Carina Nebula Identified Via Infrared Spectral Energy Distributions