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Low-metallicity (sub-SMC) massive stars

Published online by Cambridge University Press:  28 July 2017

Miriam Garcia ,
Artemio Herrero ,
Francisco Najarro ,
Inés Camacho ,
Daniel J. Lennon ,
Miguel A. Urbaneja  and
Norberto Castro
Miriam Garcia
Affiliation:
Centro de Astrobiología (INTA-CSIC), Departamento de Astrofísica. Ctra. Torrejón a Ajalvir km.4, E-28850 Torrejón de Ardoz (Madrid), Spain email: mgg@cab.inta-csic.es
Artemio Herrero
Affiliation:
Instituto de Astrofísica de Canarias, 38205 La Laguna (Tenerife), Spain Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna (Tenerife), Spain
Francisco Najarro
Affiliation:
Centro de Astrobiología (INTA-CSIC), Departamento de Astrofísica. Ctra. Torrejón a Ajalvir km.4, E-28850 Torrejón de Ardoz (Madrid), Spain email: mgg@cab.inta-csic.es
Inés Camacho
Affiliation:
Instituto de Astrofísica de Canarias, 38205 La Laguna (Tenerife), Spain Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna (Tenerife), Spain
Daniel J. Lennon
Affiliation:
European Space Astronomy Centre (ESA/ESAC), Villanueva de la Cañada (Madrid), Spain
Miguel A. Urbaneja
Affiliation:
Institut fuer Astro- und Teilchenphysik, Universitaet Innsbruck, Innsbruck, Austria
Norberto Castro
Affiliation:
Astronomy Department, University of Michigan, Ann Arbor, MI 48109, USA
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Abstract

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The double distance and metallicity frontier marked by the SMC has been finally broken with the aid of powerful multi-object spectrographs installed at 8-10m class telescopes. VLT, GTC and Keck have enabled studies of massive stars in dwarf irregular galaxies of the Local Group with poorer metal-content than the SMC. The community is working to test the predictions of evolutionary models in the low-metallicity regime, set the new standard for the metal-poor high-redshift Universe, and test the extrapolation of the physics of massive stars to environments of decreasing metallicity. In this paper, we review current knowledge on this topic.

Keywords

Galaxies: individual: IC 1613NGC 3109WLMSextans AStars: early-typeStars: Population IIIStars: windsoutflowsUltraviolet: stars

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