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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.21117 |
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| _version_ | 1866913453574193152 |
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| author | Vinokurov, A. S. Kostenkov, A. E. Atapin, K. E. Solovyeva, Yu. N. |
| author_facet | Vinokurov, A. S. Kostenkov, A. E. Atapin, K. E. Solovyeva, Yu. N. |
| contents | We continue to study the ultra-luminous X-ray source NGC 7793 P13 in the optical range. In this work, we are testing the model of a spherically symmetric wind atmosphere of the donor star, previously identified as a B9 Ia supergiant. The model spectrum has shown good agreement with the observed one at a relatively high mass loss rate of $\dot{M} \approx 6\times10^{-6}\,M_{\odot}\,\text{yr}^{-1}$; other parameters turned out to be close to those expected for late B-supergiants. The increased mass loss rate can be explained by the high rotation velocity of the star. In addition, we have qualitatively demonstrated the effect of X-ray irradiation on the observed spectrum and discuss the fundamental possibility of wind acceleration under conditions of powerful irradiation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_21117 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Nature of the Emission Spectrum of NGC 7793 P13: modeling the atmosphere of the donor star Vinokurov, A. S. Kostenkov, A. E. Atapin, K. E. Solovyeva, Yu. N. High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We continue to study the ultra-luminous X-ray source NGC 7793 P13 in the optical range. In this work, we are testing the model of a spherically symmetric wind atmosphere of the donor star, previously identified as a B9 Ia supergiant. The model spectrum has shown good agreement with the observed one at a relatively high mass loss rate of $\dot{M} \approx 6\times10^{-6}\,M_{\odot}\,\text{yr}^{-1}$; other parameters turned out to be close to those expected for late B-supergiants. The increased mass loss rate can be explained by the high rotation velocity of the star. In addition, we have qualitatively demonstrated the effect of X-ray irradiation on the observed spectrum and discuss the fundamental possibility of wind acceleration under conditions of powerful irradiation. |
| title | The Nature of the Emission Spectrum of NGC 7793 P13: modeling the atmosphere of the donor star |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2407.21117 |