Issue |
A&A
Volume 693, January 2025
|
|
---|---|---|
Article Number | A266 | |
Number of page(s) | 11 | |
Section | Astrophysical processes | |
DOI | https://doi.org/10.1051/0004-6361/202452599 | |
Published online | 27 January 2025 |
Chandra high-resolution spectra of Apep Plume: Exploring the colliding-wind picture in X-rays
Institute of Astronomy and National Astronomical Observatory (Bulgarian Academy of Sciences), 72 Tsarigradsko Chaussee Blvd., Sofia 1784, Bulgaria
⋆ Corresponding authors; szhekov@astro.bas.bg; bpetrov@astro.bas.bg
Received:
14
October
2024
Accepted:
2
December
2024
We present results of the first high-resolution observations of the massive Wolf-Rayet (WR) binary Apep Plume, taken with the Chandra High-Energy Transmission Grating in 2023 May. Analysis of these high-quality spectra showed that the spectral lines in this massive binary are broadened (full width at half-maximum, FWHM ≥ 2400 km s−1) and marginally blueshifted (∼ − 150 km s−1). A direct modelling of these spectra in the framework of the standard colliding stellar wind (CSW) picture provided a very good correspondence between the shape of the theoretical and observed spectra, but required a mass-loss reduction of 0.42 to be adopted. For a global view on this WR+WR binary, we performed a direct fitting of its optical spectrum by making use of stellar atmosphere models. The corresponding stellar parameters (mass-loss rate and wind velocities) from this analysis were used as input parameters for the CSW modelling of the X-ray emission from Apep Plume.
Key words: shock waves / stars: individual: Apep Plume / stars: winds / outflows / stars: Wolf-Rayet / X-rays: stars
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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