NIR spectral classification of the companion in the gamma-ray binary HESS J1832−093 as an O6 V star
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Título: | NIR spectral classification of the companion in the gamma-ray binary HESS J1832−093 as an O6 V star |
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Autor/es: | van Soelen, Brian | Bordas, Pol | Negueruela, Ignacio | de Oña Wilhelmi, Emma | Papitto, Alessandro | Ribó, Marc |
Grupo/s de investigación o GITE: | Astrofísica Estelar (AE) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Binaries: spectroscopic | Stars: neutron | Gamma-rays: stars | X-rays: binaries | X-rays: individual: (HESS J1832−093, 2MASS J18324516−0921545) |
Fecha de publicación: | 12-ene-2024 |
Editor: | Oxford University Press |
Cita bibliográfica: | Monthly Notices of the Royal Astronomical Society: Letters. 2024, 529(1): L102–L107. https://doi.org/10.1093/mnrasl/slae007 |
Resumen: | HESS J1832−093 is a member of the rare class of gamma-ray binaries, as recently confirmed by the detection of orbitally modulated X-ray and gamma-ray emission with a period of ∼86 d. The spectral type of the massive companion star has been difficult to retrieve as there is no optical counterpart, but the system is coincident with a near-infrared source. Previous results have shown that the infrared counterpart is consistent with an O or B-type star, but a clear classification is still lacking. We observed the counterpart twice, in 2019 and 2021, with the X-Shooter spectrograph operating on the Very Large Telescope (VLT). The obtained spectra classify the counterpart as an O6 V-type star. We estimate a distance to the source of 6.7 ± 0.5 kpc, although this estimate can be severely affected by the high extinction towards the source. This new O6 V classification for the companion star in HESS J1832−093 provides further support to an apparent grouping around a given spectral type for all discovered gamma-ray binaries that contain an O-type star. This may be due to the interplay between the initial mass function and the wind momentum–luminosity relation. |
Patrocinador/es: | BvS acknowledges support by the National Research Foundation of South Africa (grant number 119430). PB and MR acknowledge the financial support from the State Agency for Research of the Spanish Ministry of Science and Innovation under grants PID2019-105510GB-C31/AEI/10.13039/501100011033, PID2019-104114RB-C33/AEI/10.13039/501100011033, and PID2022-138172NB-C43/AEI/10.13039/501100011033/ERDF/EU, and through the Unit of Excellence María de Maeztu 2020–2023 award to the Institute of Cosmos Sciences (CEX2019-000918-M). We acknowledge financial support from Departament de Recerca i Universitats of Generalitat de Catalunya through grant 2021SGR00679. IN acknowledges the financial support of the Spanish Ministerio de Ciencia e Innovación (MCIN) with funding from the European Union NextGenerationEU and Generalitat Valenciana in the call Programa de Planes Complementarios de I+D + i (PRTR 2022), project HIAMAS (reference ASFAE/2022/017), as well as the Agencia Estatal de Investigación (MCIN/AEI/10.130 39/501 100 011 033/FEDER, UE) under grant PID2021-122397NB-C22. AP acknowledges funding from the INAF Research Grant ‘Uncovering the optical beat of the fastest magnetised neutron stars (FANS)’ and from the Italian Ministry of University and Research (MUR), PRIN 2020 (prot. 2020BRP57Z) ‘Gravitational and Electromagnetic-wave Sources in the Universe with current and next generation detectors (GEMS)’. |
URI: | http://hdl.handle.net/10045/140169 |
ISSN: | 1745-3925 (Print) | 1745-3933 (Online) |
DOI: | 10.1093/mnrasl/slae007 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © The Author(s) 2024. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1093/mnrasl/slae007 |
Aparece en las colecciones: | INV - Astrofísica Estelar - Artículos de Revistas |
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