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Observations south of HD 5980

Published online by Cambridge University Press:  29 August 2024

Andrés Sixtos Open the ORCID record for Andrés Sixtos [Opens in a new window] ,
Aida Wofford Open the ORCID record for Aida Wofford [Opens in a new window]  and
Antonio Peimbert
Andrés Sixtos*
Affiliation:
Intituto de Astronomía, UNAM
Aida Wofford
Affiliation:
Intituto de Astronomía, UNAM
Antonio Peimbert
Affiliation:
Intituto de Astronomía, UNAM
*
email: jasixtos@astro.unam.mx
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Abstract

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We study the He II λ4686 emission south of multiple-star system HD 5980, which hosts two WN-type stars. We use optical VLT FORS1 long-slit spectra. The observations are close to the eclipse phase. Broad He II emission with a SNR >5 is observed as far as 7.6 pc from HD 5980. The He II emission that is closest to HD 5980 is 1.2 pc directly south and has a redshifted component with FWHM 1450 km s-1 originating in the eclipsing WN5-6 star, and a blueshifted component with FWHM 600 km s-1. The second component cannot be explained by either the nearly- eclipsed WN star or the nearby supernova remnant, SNR B0057-724. We suggest that the additional He II emission comes from the colliding winds of the two WN stars.

Keywords

binaries: eclipsingstars: individual (HD 5980)stars: Wolf–RayetHII regionsMagellanic Clouds
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 334 - 335
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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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