NIR spectral classification of the companion in the gamma-ray binary HESS J1832–093 as an O6 V star

Q1 Earth and Planetary Sciences

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-01-11 DOI:10.1093/mnrasl/slae007

B. V. Soelen, P. Bordas, I. Negueruela, E. Wilhelmi, A. Papitto, M. Rib'o

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Abstract

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 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.

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伽马射线双星 HESS J1832-093 中伴星的近红外光谱分类为 O6 V 星

HESS J1832-093 是罕见的伽马射线双星中的一员，最近探测到的周期为 ∼86 d 的轨道调制 X 射线和伽马射线发射证实了这一点。由于没有光学对应星，因此很难检索到大质量伴星的光谱类型，但该系统与一个近红外源重合。之前的研究结果表明，这颗红外伴星与 O 或 B 型恒星一致，但仍然缺乏明确的分类。我们在 2019 年和 2021 年利用在 VLT 上运行的 X-Shooter 摄谱仪对该对应星进行了两次观测。获得的光谱将这颗对应星归类为 O6 V 型星。我们估计与源的距离为 6.7 ± 0.5 kpc，不过这一估计值可能会受到源的高消光的严重影响。HESS J1832-093中伴星的这一新的O6 V型分类为所有发现的包含O型恒星的伽马射线双星围绕特定光谱型的明显分组提供了进一步的支持。这可能是由于初始质量函数和风动量-光度关系之间的相互作用造成的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science

CiteScore

8.80

自引率

0.00%

发文量

136

期刊介绍： For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.