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Context: The commonly used extinction laws of Cardelli et al. (1989) havelimitations that, among other issues, hamper the determination of the effectivetemperatures of O and early B stars from optical+NIR photometry. Aims: We aimto develop a new family of extinction laws for 30 Doradus, check their generalapplicability within that region and elsewhere, and apply them to test thefeasibility of using optical+NIR photometry to determine the effectivetemperature of OB stars. Methods: We use spectroscopy and NIR photometry fromthe VLT-FLAMES Tarantula Survey and optical photometry from HST/WFC3 of 30Doradus and we analyze them with the software code CHORIZOS using differentassumptions such as the family of extinction laws. Results: We derive a newfamily of optical+NIR extinction laws for 30 Doradus and confirm itsapplicability to extinguished Galactic O-type systems. We conclude that byusing the new extinction laws it is possible to measure the effectivetemperatures of OB stars with moderate uncertainties and only a small bias, atleast up to E(4405-5495) ~ 1.5 mag.

astronomy and astrophysics

The VLT-FLAMES Tarantula Survey XVI. The optical+NIR extinction laws in  30 Doradus and the photometric determination of the effective temperatures of  OB stars