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- W3100464807 endingPage "138" @default.
- W3100464807 startingPage "138" @default.
- W3100464807 abstract "We report and discuss the discovery of a comoving pair of bright solar-type stars, HD 240430 and HD 240429, with a significant difference in their chemical abundances. The two stars have an estimated 3D separation of $approx 0.6$ pc ($approx 0.01$ pc projected) at a distance of $rapprox 100$ pc with nearly identical three-dimensional velocities, as inferred from Gaia TGAS parallaxes and proper motions, and high-precision radial velocity measurements. Stellar parameters determined from high-resolution Keck HIRES spectra indicate that both stars are $sim 4$ Gyr old. The more metal-rich of the two, HD 240430, shows an enhancement of refractory ($T_C>1200$ K) elements by $approx 0.2$ dex and a marginal enhancement of (moderately) volatile elements ($T_C<1200$ K, C, N, O, Na, and Mn). This is the largest metallicity difference found in a wide binary pair yet. Additionally, HD 240430 shows an anomalously high surface lithium abundance ($A(mathrm{Li})=2.75$), higher than its companion by $0.5$ dex. The proximity in phase-space and ages between the two stars suggests that they formed together with the same composition, at odds with the observed differences in metallicity and abundance patterns. We therefore suggest that the star HD~240430, Kronos, accreted 15 $M_oplus$ of rocky material after birth, selectively enhancing the refractory elements as well as lithium in its surface and convective envelope." @default.
- W3100464807 created "2020-11-23" @default.
- W3100464807 creator A5006763412 @default.
- W3100464807 creator A5025226631 @default.
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- W3100464807 creator A5041361704 @default.
- W3100464807 creator A5048918898 @default.
- W3100464807 creator A5091900050 @default.
- W3100464807 date "2018-02-21" @default.
- W3100464807 modified "2023-10-10" @default.
- W3100464807 title "Kronos and Krios: Evidence for Accretion of a Massive, Rocky Planetary System in a Comoving Pair of Solar-type Stars" @default.
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- W3100464807 doi "https://doi.org/10.3847/1538-4357/aaab4d" @default.