New evidence of binarity in young α-rich turn-off and subgiant stars: fast rotation and strong magnetic activity
Article
Yu, Jie, Casagrande, Luca, Ciuca, Ioana, Ting, Yuan-Sen, Murphy, Simon J. and Chen, Boquan. 2024. "New evidence of binarity in young α-rich turn-off and subgiant stars: fast rotation and strong magnetic activity." Monthly Notices of the Royal Astronomical Society. 530 (3), pp. 2953-2959. https://doi.org/10.1093/mnras/stae1091
Article Title | New evidence of binarity in young α-rich turn-off and subgiant stars: fast rotation and strong magnetic activity |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Yu, Jie, Casagrande, Luca, Ciuca, Ioana, Ting, Yuan-Sen, Murphy, Simon J. and Chen, Boquan |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 530 (3), pp. 2953-2959 |
Number of Pages | 7 |
Year | 2024 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stae1091 |
Web Address (URL) | https://academic.oup.com/mnras/article/530/3/2953/7656963 |
Abstract | Young α-rich (YAR) stars within the old Galactic thick disc exhibit a dual characteristic of relative youth determined with asteroseismology and abundance enhancement in α elements measured from high-resolution spectroscopy. The youth origin of YAR stars has been proposed to be binary evolution via mass transfer or stellar mergers. If that is the case, YAR stars should spin rapidly and thus be magnetically active, because they are mass and angular momentum gainers. In this study, to seek this binary footprint, we select YAR stars on the main-sequence turn-off or the subgiant branch (MSTO-SGB) from APOGEE DR17, whose ages and projected rotation velocities (vsin i) can be precisely measured. With APOGEE vsin i and LAMOST spectra, we find that YAR stars are indeed fast rotators and magnetically active. In addition, we observe low [C/N] ratios and high Gaia RUWE in some YAR stars, suggesting that these MSTO-SGB stars probably have experienced mass transfer from red-giant companions. Our findings underscore that magnetic activity can serve as a valuable tool for probing the binary evolution for other chemically peculiar stars, such as red giants with lithium anomalies and carbon-enhanced metal-poor stars. |
Keywords | binaries: general; stars: abundances; stars: activity; stars: rotation; Galaxy: disc |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | Australian National University |
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia | |
Ohio State University, United States | |
Centre for Astrophysics |
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