The binary fraction of blue horizontal branch stars

Open Access

Table 3.

Observed and intrinsic binary fractions for all BHB stars, and for halo-like, disk-like, redder, and bluer BHB subgroups, including sample size N and number of observed binaries N_b.

	OBS time	N	N_b	$f_{b}^{obs}$ $f_{\mathrm{b}}^{\mathrm{obs}}$	$f_{b}^{in}$ $f_{\mathrm{b}}^{\mathrm{in}}$
	2	299	55	18%±2%	31%±3%
All	3	263	55	21%±3%	32%±3%
	2	247	38	15%±2%	28%±3%
Halo-like	3	214	38	18%±3%	29%±3%
	2	56	17	30%±6%	46%±11%
Disk-like	3	49	17	35%±7%	51%±11%
	2	159	22	14%±3%	24%±5%
Redder	3	139	22	16%±3%	23%±5%
	2	144	33	23%±4%	42%±6%
Bluer	3	124	33	27%±4%	45%±6%

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