Bibcode
Maíz Apellániz, J.; Evans, C. J.; Barbá, R. H.; Gräfener, G.; Bestenlehner, J. M.; Crowther, P. A.; García, M.; Herrero, A.; Sana, H.; Simón-Díaz, S.; Taylor, W. D.; van Loon, J. Th.; Vink, J. S.; Walborn, N. R.
Bibliographical reference
Astronomy and Astrophysics, Volume 564, id.A63, 16 pp.
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4
2014
Journal
Citations
109
Refereed citations
100
Description
Context. The commonly used extinction laws of Cardelli et al. (1989,
ApJ, 345, 245) have limitations that, among other issues, hamper the
determination of the effective temperatures of O and early B stars from
optical and near-infrared (NIR) photometry. Aims: We aim to
develop a new family of extinction laws for 30 Doradus, check their
general applicability within that region and elsewhere, and apply them
to test the feasibility of using optical and NIR photometry to determine
the effective temperature of OB stars. Methods: We use
spectroscopy and NIR photometry from the VLT-FLAMES Tarantula Survey and
optical photometry from HST/WFC3 of 30 Doradus and we analyze them with
the software code CHORIZOS using different assumptions, such as the
family of extinction laws. Results: We derive a new family of
optical and NIR extinction laws for 30 Doradus and confirm its
applicability to extinguished Galactic O-type systems. We conclude that
by using the new extinction laws it is possible to measure the effective
temperatures of OB stars with moderate uncertainties and only a small
bias, at least up to E(4405 - 5495) ~ 1.5 mag.
Appendices are available in electronic form at http://www.aanda.org
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