دورية أكاديمية
Projected Rotational Velocities for LAMOST Stars with Effective Temperatures Lower than 9000 K
| العنوان: | Projected Rotational Velocities for LAMOST Stars with Effective Temperatures Lower than 9000 K |
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| المؤلفون: | Fang Zuo, A-Li Luo, Bing Du, Yinbi Li, Hugh R. A. Jones, Yi-han Song, Xiao Kong, Yan-xin Guo |
| المصدر: | The Astrophysical Journal Supplement Series, Vol 271, Iss 1, p 4 (2024) |
| بيانات النشر: | IOP Publishing, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Astrophysics |
| مصطلحات موضوعية: | Astronomical techniques, Stellar rotation, Astrophysics, QB460-466 |
| الوصف: | In Data Release 9 of LAMOST, we present measurements of v sin i for a total of 121,698 stars measured using the Medium Resolution Spectrograph (MRS) and 80,108 stars using the Low Resolution Spectrograph (LRS). These values were obtained through a χ ^2 minimization process, comparing LAMOST spectra with corresponding grids of synthetically broadened spectra. Due to the resolution and the spectral range of LAMOST, v sin i measurements are limited to stars with an effective temperature ( T _eff ) ranging from 5000 to 8500 K for MRS and 7000 to 9000 K for LRS. The detectable v sin i for MRS is set between 27 and 350 km s ^−1 , and for LRS between 110 and 350 km s ^−1 . This limitation is because the convolved reference spectra become less informative beyond 350 km s ^−1 . The intrinsic precision of v sin i , determined from multiepoch observations, is approximately ∼4.0 km s ^−1 for MRS and ∼10.0 km s ^−1 for LRS at a signal-to-noise ratio greater than 50. Our v sin i values show consistency with those from APOGEE17, displaying a scatter of 8.79 km s ^−1 . They are also in agreement with measurements from the Gaia DR3 and Sun et al. catalogs. An observed trend in LAMOST MRS data is the decrease in v sin i with a drop in T _eff , particularly transiting around 7000 K for dwarfs and 6500 K for giants, primarily observed in stars with near-solar abundances. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1538-4365 0067-0049 |
| Relation: | https://doaj.org/toc/0067-0049 |
| DOI: | 10.3847/1538-4365/ad1eeb |
| URL الوصول: | https://doaj.org/article/477e83259cd34b1d86802e26461a6601 |
| رقم الأكسشن: | edsdoj.477e83259cd34b1d86802e26461a6601 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 15384365 00670049 |
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| DOI: | 10.3847/1538-4365/ad1eeb |