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One step closer to the First Stars: +150 OB stars in the metal-poor galaxy Sextans A

Published online by Cambridge University Press:  29 August 2024

Marta Lorenzo Open the ORCID record for Marta Lorenzo [Opens in a new window] ,
Miriam Garcia Open the ORCID record for Miriam Garcia [Opens in a new window]  and
Francisco Najarro Open the ORCID record for Francisco Najarro [Opens in a new window]
Marta Lorenzo*
Affiliation:
Centro de Astrobiología, CSIC-INTA, Crtra. de Torrejón a Ajalvir km 4. 28850 Torrejón de Ardoz (Madrid), Spain
Miriam Garcia
Affiliation:
Centro de Astrobiología, CSIC-INTA, Crtra. de Torrejón a Ajalvir km 4. 28850 Torrejón de Ardoz (Madrid), Spain
Francisco Najarro
Affiliation:
Centro de Astrobiología, CSIC-INTA, Crtra. de Torrejón a Ajalvir km 4. 28850 Torrejón de Ardoz (Madrid), Spain
*
*email: mlorenzo@cab.inta-csic.es
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Abstract

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Local Group (LG) very metal-poor massive stars are the best proxy for the First Stars of the Universe, fundamental to model the early evolution of the first galaxies, and key to unravelling new evolutionary pathways restricted to low metallicities, such as chemically homogeneous evolution. Yet, due to the great leap in distance required to reach metal-poor galaxies of the LG and vicinity, no comprehensive spectroscopic studies have been carried out at sub-$$$$ metallicities so far.

We focus on the massive star population of the 1/10Ȯ galaxy Sextans A. After five observing campaigns at the 10.4-m Gran Telescopio Canarias (GTC), we have assembled a spectroscopic catalogue of more than 150 OB stars. This catalogue will be fundamental to test stellar evolution at very low metallicity, to detect the first binary systems at 1/10Ȯ and to unveil the most recent star formation history of this galaxy.

Keywords

Stars: early-typestars: Population IIIgalaxies: stellar contentgalaxies: individual (Sextans A)catalogs
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 52 - 57
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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