Deriving extinction laws with O stars: from the IR to the UV

TL;DR

This paper derives comprehensive extinction laws from IR to UV for O stars, improving understanding of interstellar dust effects across different environments and extending previous surveys with new photometric data.

Contribution

It presents new extinction laws for O stars from IR to UV, combining photometric data and spectral types, and compares them with laws from other stellar types and regions.

Findings

New IR to UV extinction laws for O stars in the solar neighborhood.

Comparison with extinction laws from late-type stars and H II regions.

Plans to extend extinction laws into the UV wavelength range.

Abstract

We have recently derived a family of extinction laws for 30 Doradus that provides better fits to the optical photometry of obscured stars in the Galaxy and the LMC. Simultaneously, we are extending our Galactic O-Star Spectroscopic Survey (GOSSS) to fainter, more extinguished stars to obtain accurate spectral types for massive stars with more than 6 magnitudes of $V$-band extinction. I have combined both lines of research with 2MASS, WISE, and Spitzer photometry to obtain the 1-10 micron extinction law for O stars in the solar neighborhood. I present these results and compare them with the extinction laws in the same wavelength range derived from late-type stars and H II regions. I also discuss plans to extend the newly derived optical-IR extinction laws to the UV.