Dynamical masses across the Hertzsprung-Russell diagram
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913531055570944 |
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| author | Hwang, Hsiang-Chih Ting, Yuan-Sen Cheng, Sihao Speagle, Joshua S. |
| author_facet | Hwang, Hsiang-Chih Ting, Yuan-Sen Cheng, Sihao Speagle, Joshua S. |
| contents | We infer the dynamical masses of stars across the Hertzsprung-Russell (H-R) diagram using wide binaries from the Gaia survey. Gaia's high-precision astrometry measures the wide binaries' orbital motion, which contains the mass information. Using wide binaries as the training sample, we measure the mass of stars across the two-dimensional H-R diagram using the combination of statistical inference and neural networks. Our results provide the dynamical mass measurements for main-sequence stars from 0.1 to 2 M$_\odot$, unresolved binaries and unresolved triples on the main sequence, and the mean masses of giants and white dwarfs. Two regions in the H-R diagram show interesting behaviors in mass, where one of them is pre-main-sequence stars, and the other one may be related to close compact object companions like M dwarf-white dwarf binaries. These mass measurements depend solely on Newtonian dynamics, providing independent constraints on stellar evolutionary models and the occurrence rate of compact objects. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_08584 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Dynamical masses across the Hertzsprung-Russell diagram Hwang, Hsiang-Chih Ting, Yuan-Sen Cheng, Sihao Speagle, Joshua S. Solar and Stellar Astrophysics Astrophysics of Galaxies We infer the dynamical masses of stars across the Hertzsprung-Russell (H-R) diagram using wide binaries from the Gaia survey. Gaia's high-precision astrometry measures the wide binaries' orbital motion, which contains the mass information. Using wide binaries as the training sample, we measure the mass of stars across the two-dimensional H-R diagram using the combination of statistical inference and neural networks. Our results provide the dynamical mass measurements for main-sequence stars from 0.1 to 2 M$_\odot$, unresolved binaries and unresolved triples on the main sequence, and the mean masses of giants and white dwarfs. Two regions in the H-R diagram show interesting behaviors in mass, where one of them is pre-main-sequence stars, and the other one may be related to close compact object companions like M dwarf-white dwarf binaries. These mass measurements depend solely on Newtonian dynamics, providing independent constraints on stellar evolutionary models and the occurrence rate of compact objects. |
| title | Dynamical masses across the Hertzsprung-Russell diagram |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2308.08584 |