Half a Million M Dwarf Stars Characterized Using Domain-Adapted Spectral Analysis
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866929697012580352 |
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| author | Zhang, Shuo Zhang, Hua-Wei Ting, Yuan-Sen Wang, Rui O'Briain, Teaghan Jones, Hugh R. A. Homeier, Derek Luo, A-Li |
| author_facet | Zhang, Shuo Zhang, Hua-Wei Ting, Yuan-Sen Wang, Rui O'Briain, Teaghan Jones, Hugh R. A. Homeier, Derek Luo, A-Li |
| contents | We present fundamental atmospheric parameters (Teff and log g) and metallicities ([M/H]) for 507,513 M dwarf stars using low-resolution spectra (R~1800) from LAMOST DR10. By employing Cycle-StarNet, an innovative domain adaptation approach, we successfully bridge the gap between theoretical PHOENIX synthetic spectra and observed LAMOST spectra, enabling parameter measurements even for lower signal-to-noise data (S/N>5). The fitting residual analysis shows a reduction from 2.0 times to 1.68 times the flux uncertainty. Comparing with available literature values, we find systematic offsets and precisions of 12$\pm$70 K in Teff, -0.04$\pm$0.17 dex in log g, and -0.06$\pm$0.20 dex in [M/H]. The precision improves for higher quality spectra (S/N>50) to 47 K, 0.12 dex, and 0.14 dex respectively. The metallicity consistency between wide binaries shows a scatter of 0.24 dex, improving to 0.15 dex at S/N>50. We provide a comprehensive catalog including stellar parameters, spectral classifications, activity indicators, and binary/variability flags, establishing a resource for studies of the most numerous stellar population. The complete catalog is available at https://doi.org/10.5281/zenodo.14030249. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_01910 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Half a Million M Dwarf Stars Characterized Using Domain-Adapted Spectral Analysis Zhang, Shuo Zhang, Hua-Wei Ting, Yuan-Sen Wang, Rui O'Briain, Teaghan Jones, Hugh R. A. Homeier, Derek Luo, A-Li Solar and Stellar Astrophysics We present fundamental atmospheric parameters (Teff and log g) and metallicities ([M/H]) for 507,513 M dwarf stars using low-resolution spectra (R~1800) from LAMOST DR10. By employing Cycle-StarNet, an innovative domain adaptation approach, we successfully bridge the gap between theoretical PHOENIX synthetic spectra and observed LAMOST spectra, enabling parameter measurements even for lower signal-to-noise data (S/N>5). The fitting residual analysis shows a reduction from 2.0 times to 1.68 times the flux uncertainty. Comparing with available literature values, we find systematic offsets and precisions of 12$\pm$70 K in Teff, -0.04$\pm$0.17 dex in log g, and -0.06$\pm$0.20 dex in [M/H]. The precision improves for higher quality spectra (S/N>50) to 47 K, 0.12 dex, and 0.14 dex respectively. The metallicity consistency between wide binaries shows a scatter of 0.24 dex, improving to 0.15 dex at S/N>50. We provide a comprehensive catalog including stellar parameters, spectral classifications, activity indicators, and binary/variability flags, establishing a resource for studies of the most numerous stellar population. The complete catalog is available at https://doi.org/10.5281/zenodo.14030249. |
| title | Half a Million M Dwarf Stars Characterized Using Domain-Adapted Spectral Analysis |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2502.01910 |