Carbon enrichment in APOGEE disk stars as evidence of mass transfer in binaries

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Table 4

Summary of observed binary fraction, f_b, by population.

Population	Base count	Binaries	f_b	$σ_{f_{b}}$ $\[\sigma_{f_b}\]$
Low α	39174	6610	16.9%	0.2%
Early High α	11860	1959	16.5%	0.3%
Late High α	5632	870	15.5%	0.5%

Notes. See Sec. 2.5 for description of populations. The final column shows binomial standard deviation in binary fraction assuming a uniform distribution and expressed as a percentage of population for ease of comparison with f_b.

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