Looking for Signs of Unresolved Binarity in the Continuum of LAMOST Stellar Spectra
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Prokhorov, Mikhail Tan, Kefeng Samus, Nikolay Luo, Ali Kovaleva, Dana Zhao, Jingkun Liu, Yujuan Kaygorodov, Pavel Malkov, Oleg Song, Yihan Sichevskij, Sergey Yungelson, Lev Zhao, Gang |
| author_facet | Prokhorov, Mikhail Tan, Kefeng Samus, Nikolay Luo, Ali Kovaleva, Dana Zhao, Jingkun Liu, Yujuan Kaygorodov, Pavel Malkov, Oleg Song, Yihan Sichevskij, Sergey Yungelson, Lev Zhao, Gang |
| contents | We describe an attempt to derive the binarity rate of samples of 166 A-, F-, G-, and K-type stars from LAMOST DR5 and 1000 randomly selected presumably single stars from Gaia DR3 catalogs. To this end, we compared continua of the observed spectra with the continua of synthetic spectra in the 3700 to 9097 Angstrom range. The latter spectra were reduced to the LAMOST set of wavelengths, while the former ones were smoothed. Next, we searched for every observed star the nearest synthetic spectrum using a four-parameter representation - effective temperature, gravity, [Fe/H], and a range of interstellar absorption values. However, rms deviations of observed spectra from synthetic ones appeared to be not sufficient to claim that any of the stars is a binary. We conclude that comparison of the intensity of pairs of spectral lines remains the best way to detect binarity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_20802 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Looking for Signs of Unresolved Binarity in the Continuum of LAMOST Stellar Spectra Prokhorov, Mikhail Tan, Kefeng Samus, Nikolay Luo, Ali Kovaleva, Dana Zhao, Jingkun Liu, Yujuan Kaygorodov, Pavel Malkov, Oleg Song, Yihan Sichevskij, Sergey Yungelson, Lev Zhao, Gang Solar and Stellar Astrophysics Astrophysics of Galaxies We describe an attempt to derive the binarity rate of samples of 166 A-, F-, G-, and K-type stars from LAMOST DR5 and 1000 randomly selected presumably single stars from Gaia DR3 catalogs. To this end, we compared continua of the observed spectra with the continua of synthetic spectra in the 3700 to 9097 Angstrom range. The latter spectra were reduced to the LAMOST set of wavelengths, while the former ones were smoothed. Next, we searched for every observed star the nearest synthetic spectrum using a four-parameter representation - effective temperature, gravity, [Fe/H], and a range of interstellar absorption values. However, rms deviations of observed spectra from synthetic ones appeared to be not sufficient to claim that any of the stars is a binary. We conclude that comparison of the intensity of pairs of spectral lines remains the best way to detect binarity. |
| title | Looking for Signs of Unresolved Binarity in the Continuum of LAMOST Stellar Spectra |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2508.20802 |