The RGB tip of galactic globular clusters and the revision of the axion-electron coupling bound

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Table 5.

Uncertainties of cluster parameters and their effects on the tip bolometric magnitude.

Parameter	Reference value	Uncertainty	δM_bol^(a)
Y	0.25	−0.01; +0.05	0.045
[M/H]	C2009 ^(b)	±0.2	0.080
Age	13 Gyr	±10%	0.006

Notes.

^(a)

Full width variation of the tip bolometric magnitude.

^(b)

Carretta et al. (2009). See text for more details.

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