First direct detection of an RR Lyrae star conclusively associated with an intermediate-age cluster

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Table 1

Astrometric and physical parameters for the Trumpler 5 cluster and the RRL star.

Trumpler 5 cluster

(RA, Dec)	(99.12705764, +9.45854713) deg
(l, b)	(202.82, +1.02) deg
Parallax	(0.302 ± 0.002) mas
pmRA^*	(−0.618 ± 0.003) mas/yr
pmDec	(0.269 ± 0.002) mas/yr
Mass	(2.46 ± +0.17) × 10⁴ M_⊙
Age	2.2-4.2 Gyr
	2.5 Gyr (O25)
	( ${2.17}_{- 0.70}^{+ 1.00}$ $Mathematical equation: $2.17_{-0.70}^{+1.00}$$ ) Gyr(H23)
	(3.5 ± 1.7)Gyr(D21)
	4.2 Gyr (CG20)
Distance	( ${2.905}_{- 0.009}^{+ 0.010}$ $Mathematical equation: $2.905_{-0.009}^{+0.010}$$ ) kpc(H23)
	3.047 kpc (CG20)
[Fe/H]	−0.403 ± 0.006 (D15)
A_v	(1.71 ± +0.19) mag(H23)
r_t	(0.50 deg, 25.5 pc) (H23)
r_c	(0.077 deg, 3.9 pc) (H23)
r₅₀	(0.11 deg, 5.4 pc) (H23)

RRL

source_id	3326852328563919744
(RA, Dec)	(98.90796904, 9.72592814) deg
(l, b)	(202°.48, 0°.95) deg
Parallax	(0.306 ± 0.028) mas
Distance (trig.)	2.95 ± 0.27 kpc (from parallax)
A_v	(1.65 ± 0.15) mag (G19)
	(1.503 ± 0.090) mag (L22)
pmRA^*	(−0.627 ± 0.031) mas/yr
pmDec	(0.328 ± 0.026) mas/yr
G	(14.874 ± 0.012) mag
ruwe	1.1
BEP	1.3

Notes. O25 = Özdemir et al. (2025), H23 = Hunt & Reffert (2023), D21 = Dias et al. (2021), CG20 = Cantat-Gaudin et al. (2020), D15 = Donati et al. (2015), G19 = Green et al. (2019), L22 = Lallement et al. (2022).

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