Direct Method to Compute Doppler Beaming Factors in Binary Stars
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914903427645440 |
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| author | Zheng, Chuanjie Huang, Yang Liu, Jifeng Lu, Youjun Han, Henggeng Tan, Yuan Beers, Timothy C. |
| author_facet | Zheng, Chuanjie Huang, Yang Liu, Jifeng Lu, Youjun Han, Henggeng Tan, Yuan Beers, Timothy C. |
| contents | The Doppler beaming effect, induced by the reflex motion of stars, introduces flux modulations and serves as an efficient method to photometrically determine mass functions for a large number of close binary systems, particularly those involving compact objects. In order to convert observed beaming-flux variations into a radial-velocity curve, precise determination of the beaming factor is essential. Previously, this factor was calculated as a constant, assuming a power-law profile for stellar spectra. In this study, we present a novel approach to directly compute this factor. Our new method not only simplifies the computation, especially for blue bands and cool stars, but also enables us to evaluate whether the relationship between beaming flux and radial velocity can be accurately described as linear. We develop a python code and compute a comprehensive beaming-factor table for commonly used filter systems covering main-sequence, subgiant, and giant stars, as well as hot subdwarf and white dwarf stars. Both the code and our table are archived and publicly available at http://doi.org/10.5281/zenodo.13049419. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_01033 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Direct Method to Compute Doppler Beaming Factors in Binary Stars Zheng, Chuanjie Huang, Yang Liu, Jifeng Lu, Youjun Han, Henggeng Tan, Yuan Beers, Timothy C. Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics The Doppler beaming effect, induced by the reflex motion of stars, introduces flux modulations and serves as an efficient method to photometrically determine mass functions for a large number of close binary systems, particularly those involving compact objects. In order to convert observed beaming-flux variations into a radial-velocity curve, precise determination of the beaming factor is essential. Previously, this factor was calculated as a constant, assuming a power-law profile for stellar spectra. In this study, we present a novel approach to directly compute this factor. Our new method not only simplifies the computation, especially for blue bands and cool stars, but also enables us to evaluate whether the relationship between beaming flux and radial velocity can be accurately described as linear. We develop a python code and compute a comprehensive beaming-factor table for commonly used filter systems covering main-sequence, subgiant, and giant stars, as well as hot subdwarf and white dwarf stars. Both the code and our table are archived and publicly available at http://doi.org/10.5281/zenodo.13049419. |
| title | Direct Method to Compute Doppler Beaming Factors in Binary Stars |
| topic | Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2408.01033 |