Period-luminosity and period-luminosity-metallicity relation for $δ$ Scuti Stars
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arXiv
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| Format: | Preprint |
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2025
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| author | Liu, Yan-qi Chen, Xiao-dian Wang, Shu Wang, Kun Jia, Qi Deng, Li-cai |
| author_facet | Liu, Yan-qi Chen, Xiao-dian Wang, Shu Wang, Kun Jia, Qi Deng, Li-cai |
| contents | $δ$ Scuti ($δ$ Sct) stars are potential distance tracers for studying the Milky Way structure. We conduct a comprehensive analysis of the period-luminosity (PL) and period-luminosity-metallicity (PLZ) relation for $δ$ Sct stars, integrating data from the Zwicky Transient Facility (ZTF), the Transiting Exoplanet Survey Satellite (TESS), Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), Apache Point Observatory Galactic Evolution Experiment (APOGEE), and Gaia. To mitigate the impact of the Gaia parallax zero point offset, we applied a correction method, determining the optimal zero point value to be $zp_\varpi = 35 \pm 2 \, μ\text{as}$. Using the three best bands, by varying the parallax error threshold, we found that the total error of the PLR zero point was minimized to 0.9\% at a parallax error threshold of 6\%. With this threshold, we derived the PL and PLZ relation for nine bands (from optical to mid-infrared) and five Wesenheit bands. Through our analysis, we conclude that the influence of metallicity on the PLR of $δ$ Sct stars is not significant, and the differences across various bands are minimal. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_15045 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Period-luminosity and period-luminosity-metallicity relation for $δ$ Scuti Stars Liu, Yan-qi Chen, Xiao-dian Wang, Shu Wang, Kun Jia, Qi Deng, Li-cai Solar and Stellar Astrophysics Astrophysics of Galaxies $δ$ Scuti ($δ$ Sct) stars are potential distance tracers for studying the Milky Way structure. We conduct a comprehensive analysis of the period-luminosity (PL) and period-luminosity-metallicity (PLZ) relation for $δ$ Sct stars, integrating data from the Zwicky Transient Facility (ZTF), the Transiting Exoplanet Survey Satellite (TESS), Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), Apache Point Observatory Galactic Evolution Experiment (APOGEE), and Gaia. To mitigate the impact of the Gaia parallax zero point offset, we applied a correction method, determining the optimal zero point value to be $zp_\varpi = 35 \pm 2 \, μ\text{as}$. Using the three best bands, by varying the parallax error threshold, we found that the total error of the PLR zero point was minimized to 0.9\% at a parallax error threshold of 6\%. With this threshold, we derived the PL and PLZ relation for nine bands (from optical to mid-infrared) and five Wesenheit bands. Through our analysis, we conclude that the influence of metallicity on the PLR of $δ$ Sct stars is not significant, and the differences across various bands are minimal. |
| title | Period-luminosity and period-luminosity-metallicity relation for $δ$ Scuti Stars |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.15045 |