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Winds of metal-poor OB stars: Updates from HST-COS UV spectroscopy

Published online by Cambridge University Press:  23 January 2015

M. García ,
A. Herrero ,
F. Najarro ,
D. J. Lennon  and
M. A. Urbaneja
M. García
Affiliation:
Centro de Astrobiología, CSIC-INTA email: [email protected]
A. Herrero
Affiliation:
Instituto de Astrofísica de Canarias Departamento de Astrofísica, Universidad de La Laguna
F. Najarro
Affiliation:
Centro de Astrobiología, CSIC-INTA email: [email protected]
D. J. Lennon
Affiliation:
European Space Astronomy Centre
M. A. Urbaneja
Affiliation:
Institute for Astro- and Particle Physics, University of Innsbruck Institute for Astronomy, University of Hawai'i
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Abstract

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In the race to break the SMC frontier and reach metallicity conditions closer to the First Stars the information from UV spectroscopy is usually overlooked. New HST-COS observations of OB stars in the metal-poor galaxy IC1613, with oxygen content ~1/10 solar, have proved the important role of UV spectroscopy to characterize blue massive stars and their winds. The terminal velocities (υ∞) and abundances derived from the dataset have shed new light on the problem of metal-poor massive stars with strong winds. Furthermore, our results question the υ∞-υesc and υ∞-Z scaling relations whose use in optical-only studies may introduce large uncertainties in the derived mass loss rates and wind-momenta. Finally, our results indicate that the detailed abundance pattern of each star may have a non-negligible impact on its wind properties, and scaling these as a function of one single metallicity parameter is probably too coarse an approximation. Considering, for instance, that the [α/Fe] ratio evolves with the star formation history of each galaxy, we may be in need of updating all our wind recipes.

Keywords

Galaxies: individual: IC 1613 – Stars: early-type – Stars: massive – Stars: Population III – Stars: windsoutflows – Ultraviolet: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 41 - 46
Copyright
Copyright © International Astronomical Union 2015 

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