Speckle imaging of 81 RR Lyrae stars detects 10 likely bound companions at 20-220 AU separations, yielding a binary fraction estimate above 12 percent.
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A revised parallel chemical evolution model with pre-enriched delayed second infall explains the Milky Way's alpha-element abundance patterns, co-evolution phase, and old low-alpha stars from APOGEE data.
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Finding the elusive RR Lyrae companions via speckle imaging
Speckle imaging of 81 RR Lyrae stars detects 10 likely bound companions at 20-220 AU separations, yielding a binary fraction estimate above 12 percent.
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Co-evolution of the Milky Way high- and low-{\alpha} sequences with chemical evolution models
A revised parallel chemical evolution model with pre-enriched delayed second infall explains the Milky Way's alpha-element abundance patterns, co-evolution phase, and old low-alpha stars from APOGEE data.