Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8520
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dc.contributor.authorSingh, Raghubar-
dc.contributor.authorMallick, Anohita-
dc.contributor.authorReddy, B. E-
dc.contributor.authorPandey, Jeewan C-
dc.contributor.authorZhao, Gang-
dc.date.accessioned2024-08-30T05:00:57Z-
dc.date.available2024-08-30T05:00:57Z-
dc.date.issued2024-08-10-
dc.identifier.citationThe Astrophysical Journal Letters, Vol. 971, No. 1, L3en_US
dc.identifier.issn2041-8205-
dc.identifier.urihttp://hdl.handle.net/2248/8520-
dc.descriptionOpen Accessen_US
dc.descriptionOriginal content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.-
dc.description.abstractThis 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 Prot = 30.4 ± 0.1 days, which translates to rotational velocity Vrot = 19.5 ± 1.7 km s−1. The star's location in the Hertzsprung–Russell diagram, derived values of 12C/13C = 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 Vrot 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.en_US
dc.language.isoenen_US
dc.publisherAmerican Astronomical Societyen_US
dc.relation.urihttps://doi.org/10.3847/2041-8213/ad62f6-
dc.rights© 2024. The Author(s).-
dc.subjectLow mass starsen_US
dc.subjectStellar rotationen_US
dc.subjectStellar flaresen_US
dc.subjectAsteroseismologyen_US
dc.subjectStellar abundancesen_US
dc.titleStudy of a Red Clump Giant, KIC 11087027, with High Rotation and Strong Infrared Excess—Evidence of Tidal Interaction for High Lithium Abundanceen_US
dc.typeArticleen_US
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