2026-04-17T03:30:18Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2203432025-12-05T16:48:14Zcom_2072_1057col_2072_478823col_2072_478917

urn:hdl:2445/220343 NIR spectral classification of the companion in the gamma-ray binary HESS J1832-093 as an O6 V star Van Soelen, Brian Bordas Coma, Pol Negueruela, Ignacio De Oña Wilhelmi, E. Papitto, A. Ribó Gomis, Marc Estels de neutrons Estels binaris Raigs X Neutron stars Double stars X-rays 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. 2025-04-08T16:48:18Z 2025-04-08T16:48:18Z 2024-03-01 2025-04-08T16:48:18Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1093/mnrasl/slae007 Monthly Notices of the Royal Astronomical Society: Letters, 2024, vol. 529, num.1 https://doi.org/10.1093/mnrasl/slae007 (c) Van Soelen, B. et al., 2024 info:eu-repo/semantics/openAccess Royal Astronomical Society Articles publicats en revistes (Física Quàntica i Astrofísica)