On the metallicity of open clusters - III. Homogenised sample

Free Access

Table 3

Derived metallicity gradients based on open cluster data.

Range	N	ZP	Slope	Notes

<12 kpc	88	+0.72 ± 0.08	−0.086 ± 0.009	all data
<12 kpc	82	+0.54 ± 0.07	−0.066 ± 0.007	^a
≤9 kpc	64	+0.71 ± 0.14	−0.085 ± 0.017	all data
≤9 kpc	61	+0.51 ± 0.12	−0.061 ± 0.015	^a
9–12 kpc	24	+0.52 ± 0.39	−0.068 ± 0.037	all data
9–12 kpc	21	+0.41 ± 0.29	−0.054 ± 0.028	^a
>12 kpc	12	−0.04 ± 0.12	−0.016 ± 0.007	all data
>12 kpc	10	−0.26 ± 0.07		^b

≤0.5 Gyr	35	+0.62 ± 0.12	−0.079 ± 0.015	all data
1–2.5 Gyr	18	+0.74 ± 0.11	−0.082 ± 0.013	all data
1–2.5 Gyr	17	+0.63 ± 0.12	−0.072 ± 0.013	^a

Notes. Zero points (ZP) and slopes of the linear fits.

^(a)

Excluding the strong over- or underabundant objects as discussed in the text.

^(b)

Mean metallicity excluding the most distant objects Berkeley 29 and Saurer 1.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.