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• W2933962022 startingPage "47" @default.
• W2933962022 abstract "At an age of 4 Gyr, typical solar-type stars in M67 have rotation rates of 20–30 days. Using K2 Campaign 5 and 16 light curves and the spectral archive of the WIYN Open Cluster Study, we identify 11 3D kinematic members of M67 with anomalously fast rotation periods of 2–8 days, implying ages of less than 1 Gyr. We hypothesize that these anomalously fast rotators have been spun up by mass transfer, mergers, or stellar collisions during dynamical encounters within the 1 Gyr and thus represent lower-luminosity counterparts to the blue straggler stars. These 11 candidate post-interaction stellar systems have much in common with the blue stragglers, including a high binary fraction (73%); a number of long-period, low-eccentricity binary systems; and in at least one case a UV excess consistent with the presence of a hot white dwarf companion. The identification of these 11 systems provides the first picture of the low-luminosity end of the blue straggler distribution, providing new constraints for detailed binary evolution models and cluster population studies. This result also clearly demonstrates the need to properly account for the impact of binaries on stellar evolution, as significant numbers of post-interaction binaries likely exist on cluster main sequences and in the field. These stars are not always easy to identify but make up ∼10% or more of the spectroscopic binary population among the solar-type stars in M67." @default.
• W2933962022 created "2019-04-11" @default.
• W2933962022 creator A5011850064 @default.
• W2933962022 creator A5032293375 @default.
• W2933962022 creator A5053727482 @default.
• W2933962022 creator A5054100395 @default.
• W2933962022 creator A5068127095 @default.
• W2933962022 date "2019-08-12" @default.
• W2933962022 modified "2023-10-01" @default.
• W2933962022 title "Blue Lurkers: Hidden Blue Stragglers on the M67 Main Sequence Identified from Their <i>Kepler</i>/<i>K</i>2 Rotation Periods" @default.
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