On the metallicity of open clusters - III. Homogenised sample

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Table 2

Photometric metallicity scales.

System	Δ[Fe/H]^a	Median	No. of clusters^b

DDO	−0.001 ± 0.086	−0.002	41/44
DG	+0.022 ± 0.046	+0.030	31/34
	+0.002 ± 0.045^c	+0.010	31/34
UBV _p	−0.051 ± 0.089	−0.057	20/25
UBV^c	−0.192 ± 0.174	−0.180	15/17
Strömgren	−0.034 ± 0.098	−0.043	21/22
Caby	−0.045 ± 0.104	−0.070	7/9
Ca ii	−0.047 ± 0.098	−0.048	14/15
LQS	−0.020 ± 0.089	−0.030	31/32

Friel^d	a = −0.223(17); b = −0.295(81)		28/31

Notes.

^(a)

The mean differences after 2σ clipping are given in the form: photometric system − spectroscopic (HQS/LQS) values, or LQS − HQS.

^(b)

The number of clusters used to derive the zero-points and the total sample in this category.

^(c)

The difference if applying the new transformation as discussed in the text.

^(d)

Δ[Fe/H]= a + b[Fe/H]_H/LQS; the errors of the last significant digits are given in parenthesis. The mean error after the correction is 0.115 dex.

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