دورية أكاديمية
Study of a Red Clump Giant, KIC 11087027, with High Rotation and Strong Infrared Excess—Evidence of Tidal Interaction for High Lithium Abundance
| العنوان: | Study of a Red Clump Giant, KIC 11087027, with High Rotation and Strong Infrared Excess—Evidence of Tidal Interaction for High Lithium Abundance |
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| المؤلفون: | Raghubar Singh, Anohita Mallick, Bacham E. Reddy, Jeewan C. Pandey, Gang Zhao |
| المصدر: | The Astrophysical Journal Letters, Vol 971, Iss 1, p L3 (2024) |
| بيانات النشر: | IOP Publishing, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Astrophysics |
| مصطلحات موضوعية: | Low mass stars, Stellar rotation, Stellar flares, Asteroseismology, Stellar abundances, Astrophysics, QB460-466 |
| الوصف: | This Letter presents results from Kepler photometric light curves and a high-resolution spectroscopic study of a super-Li-rich giant KIC11087027. Using the light-curve analysis, we measured the star’s rotational period P _rot = 30.4 ± 0.1 days, which translates to rotational velocity V _rot = 19.5 ± 1.7 km s ^−1 . The star’s location in the Hertzsprung–Russell diagram, derived values of ^12 C/ ^13 C = 7 ± 1 and [C/N] = −0.95 ± 0.2, and the inferred asteroseismic parameters from secondary calibration based on spectra suggest the star is a low-mass red clump giant in the He-core burning phase. Using Gaia data, we found evidence of variation in radial velocity and proper motion, indicative of presence of an unresolved binary. The large V _rot is probably a result of tidal synchronization combined with the aftereffects of He flash, in which the size of the star is reduced significantly. The simultaneous presence of features like high rotation, very high Li abundance, strong dust shell, and strong flares in a single star is relatively uncommon, suggesting that the star experiencing tidal synchronization has recently undergone He flash. The results pose a question whether the binary interaction, hence the high rotation, is a prerequisite for the dredging up of the high amounts of Li from the interior to the photosphere during or immediately after the He-flash event. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2041-8213 2041-8205 |
| Relation: | https://doaj.org/toc/2041-8205 |
| DOI: | 10.3847/2041-8213/ad62f6 |
| URL الوصول: | https://doaj.org/article/fe33aac9429741e7865022c8ebefb1ee |
| رقم الأكسشن: | edsdoj.fe33aac9429741e7865022c8ebefb1ee |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 20418213 20418205 |
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| DOI: | 10.3847/2041-8213/ad62f6 |