Combined Gemini-South and HST photometric analysis of the globular cluster NGC 6558 - The age of the metal-poor population of the Galactic bulge

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Volume 690 (October 2024)

A&A, 690 (2024) A37

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Table 1

Parameters of five RR Lyrae classified as members of NGC 6558 from their membership probabilities.

OGLE ID	14866	14886	14888	14892	14912	< >
RA	272.555	272.565	272.566	272.568	272.582	–
DEC	−31.771	−31.765	−31.778	−31.762	−31.768	–
$μ_{α}^{}$ $\mu _\alpha ^$	−0.138	0.113	0.055	0.281	−0.273	–
µ_δ	−0.009	−0.139	0.008	−0.026	−0.087	–
I (OGLE)	15.548	15.636	15.633	15.253	15.418	15.50 ± 0.03
V (OGLE)	16.498	16.619	16.489	16.234	16.577	16.49 ± 0.03
G (Gaia)	16.297	16.326	16.251	15.979	16.291	16.23 ± 0.03
m_F606W	16.058	16.331	16.343	15.942	16.377	16.21 ± 0.04
m_F814W	15.622	15.224	15.583	15.261	15.422	15.42 ± 0.03
J	–	15.153	–	14.560	14.660	14.79 ± 0.08
K_S	–	14.616	–	14.024	14.111	14.25 ± 0.08
Period	0.504	0.467	0.312	0.756	0.687	–
Type	RRab	RRab	RRc	RRab	RRab	–
𝒫_memb	0.833	0.923	0.846	0.845	0.865	–

Notes The last column is the weighted average of the RR Lyrae mean magnitudes in different photometric systems.

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