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• W3100846355 endingPage "A63" @default.
• W3100846355 startingPage "A63" @default.
• W3100846355 abstract "The objective of this work is to determine what fraction of red-giant (RG) stars shows photometric rotational modulation, and understand its origin. One of the underlying questions is the role of close binarity in this population, standing upon the fact that RGs in short-period binary systems (<150 days or so) have been observed to display strong rotational modulation. We select a sample of about 4500 relatively bright RGs observed by Kepler, and show that 370 of them (8%) display rotational modulation. Almost all have oscillation amplitudes below the median of the sample, while 30 of them are not oscillating at all. Of the 85 of these RGs with rotational modulation chosen for follow-up radial-velocity observation and analysis, 34 show clear evidence of spectroscopic binarity. Surprisingly, 26 of the 30 non-oscillators are in this group of binaries. To the contrary, about 85% of the active RGs with detectable oscillations are not part of close binaries. With the help of stellar masses and evolutionary states computed from the oscillation properties, it appears that low-mass red-giant branch stars tend to be magnetically inactive, while intermediate-mass ones tend to be highly active. The opposite trends are true for helium-core burning (red clump) stars, whereby the lower-mass clump stars are comparatively more active and the higher-mass ones less so. In other words, we find that low-mass red-giant branch stars gain angular momentum as they evolve to clump stars, while higher-mass ones lose angular momentum. The trend observed with low-mass stars leads to possible scenarios of planet engulfment or other merging events during the shell-burning phase. Regarding intermediate-mass stars, the rotation periods are long with respect to theoretical expectations reported in the literature, which reinforces the existence of an unidentified sink of angular momentum after the main sequence." @default.
• W3100846355 created "2020-11-23" @default.
• W3100846355 creator A5003492847 @default.
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• W3100846355 creator A5084705037 @default.
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• W3100846355 date "2020-07-01" @default.
• W3100846355 modified "2023-10-16" @default.
• W3100846355 title "Active red giants: Close binaries versus single rapid rotators" @default.
• W3100846355 cites W1559350678 @default.
• W3100846355 cites W1855557644 @default.
• W3100846355 cites W1942647475 @default.
• W3100846355 cites W1968705911 @default.
• W3100846355 cites W1988960185 @default.
• W3100846355 cites W1996572743 @default.
• W3100846355 cites W1999393445 @default.
• W3100846355 cites W2001478608 @default.
• W3100846355 cites W2002731525 @default.
• W3100846355 cites W2014129085 @default.
• W3100846355 cites W2030093702 @default.
• W3100846355 cites W2032789937 @default.
• W3100846355 cites W2044183576 @default.
• W3100846355 cites W2055626279 @default.
• W3100846355 cites W2055806021 @default.
• W3100846355 cites W2055960232 @default.
• W3100846355 cites W2059510669 @default.
• W3100846355 cites W2060096296 @default.
• W3100846355 cites W2071157209 @default.
• W3100846355 cites W2077333009 @default.
• W3100846355 cites W2106129223 @default.
• W3100846355 cites W2108910145 @default.
• W3100846355 cites W2127400668 @default.
• W3100846355 cites W2130023882 @default.
• W3100846355 cites W2132117032 @default.
• W3100846355 cites W2136480578 @default.
• W3100846355 cites W2142065254 @default.
• W3100846355 cites W2144214856 @default.
• W3100846355 cites W2150562197 @default.
• W3100846355 cites W2152543234 @default.
• W3100846355 cites W2161805421 @default.
• W3100846355 cites W2162606529 @default.
• W3100846355 cites W2162956769 @default.
• W3100846355 cites W2167549591 @default.
• W3100846355 cites W2167758423 @default.
• W3100846355 cites W2204423677 @default.
• W3100846355 cites W2225476321 @default.
• W3100846355 cites W2227238449 @default.
• W3100846355 cites W2321855333 @default.
• W3100846355 cites W2337071322 @default.
• W3100846355 cites W2341399662 @default.
• W3100846355 cites W2479514960 @default.
• W3100846355 cites W2522971153 @default.
• W3100846355 cites W2533445604 @default.
• W3100846355 cites W2593224863 @default.
• W3100846355 cites W2605051315 @default.
• W3100846355 cites W2761986865 @default.
• W3100846355 cites W2784922861 @default.
• W3100846355 cites W2797663741 @default.
• W3100846355 cites W2798279369 @default.
• W3100846355 cites W2798336535 @default.
• W3100846355 cites W2798341770 @default.
• W3100846355 cites W2811509563 @default.
• W3100846355 cites W2908396867 @default.
• W3100846355 cites W2919458541 @default.
• W3100846355 cites W2943439031 @default.
• W3100846355 cites W2949380767 @default.
• W3100846355 cites W3098530119 @default.
• W3100846355 cites W3098742043 @default.
• W3100846355 cites W3099100952 @default.
• W3100846355 cites W3099265952 @default.
• W3100846355 cites W3099353780 @default.
• W3100846355 cites W3099462664 @default.
• W3100846355 cites W3100125708 @default.
• W3100846355 cites W3100757578 @default.
• W3100846355 cites W3101551363 @default.
• W3100846355 cites W3101566868 @default.
• W3100846355 cites W3101659855 @default.
• W3100846355 cites W3101721752 @default.
• W3100846355 cites W3102975160 @default.
• W3100846355 cites W3103183622 @default.
• W3100846355 cites W3103512176 @default.
• W3100846355 cites W3103804222 @default.
• W3100846355 cites W3104736107 @default.
• W3100846355 cites W3104805092 @default.
• W3100846355 cites W3105624912 @default.
• W3100846355 cites W3106216904 @default.
• W3100846355 cites W3122235257 @default.
• W3100846355 cites W3124573333 @default.
• W3100846355 cites W3125167775 @default.
• W3100846355 cites W4289861673 @default.
• W3100846355 cites W4291272239 @default.
• W3100846355 cites W4291432632 @default.

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