Probing the origins - I. Generalised additive model inference of birth radii for Milky Way stars in the solar vicinity

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Volume 696 (April 2025)

A&A, 696 (2025) A205

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Table 3

Comprehensive data summary of stars affected by either churning (C) or a combination of blurring and undisturbed motion (B/U) in the various cluster groups.

Group	Movement	Direction	N_★	%	〈[Fe/H])〈	${\bar{t}}_{⋆}$ $\overline{t}_{\star}$ (Gyr)	〈e〈	〈Z_max〈 (kpcs)	〈L_r〈	〈L_ϕ〈 (kpc · km/s)	〈L_z〈
	C	Inward	0	0.00	N/A	N/A	N/A	N/A	N/A	N/A	N/A
2		Outward	148	91.36	0.32	7.76	0.15	0.60	29.38	29.12	1649.04
	B/U	Equal	14	8.64	0.27	3.89	0.18	0.68	58.47	−11.51	1404.36

	C	Inward	3	1.47	0.08	3.72	0.19	0.54	96.16	−11.62	1314.92
1		Outward	153	76.50	0.16	8.51	0.13	0.64	56.04	17.92	1792.52
	B/U	Equal	44	21.57	0.13	6.46	0.14	0.49	39.77	12.46	1595.18

	C	Inward	15	3.88	0.02	3.09	0.11	0.52	63.30	9.93	1547.70
6		Outward	248	66.31	0.01	10.23	0.13	0.71	52.20	4.95	1831.85
	B/U	Equal	111	28.68	−0.01	6.17	0.12	0.57	−31.71	30.72	1741.60

	C	Inward	38	12.88	−0.23	3.72	0.12	0.59	−87.58	−23.39	1689.26
5		Outward	163	55.25	−0.18	11.75	0.14	0.71	74.99	20.21	1837.53
	B/U	Equal	94	31.86	−0.17	6.76	0.12	0.61	35.58	−9.93	1850.79

	C	Inward	43	31.62	−0.46	5.78	0.14	1.00	−87.70	50.58	1828.45
4		Outward	70	51.47	−0.34	12.88	0.14	0.67	19.07	17.86	1879.33
	B/U	Equal	23	16.91	−0.45	8.51	0.17	1.34	158.55	−44.37	1888.64

	C	Inward	9	42.86	−0.66	7.08	0.13	1.25	−56.03	−88.74	2029.65
3		Outward	2	9.52	−0.70	13.49	0.13	2.06	229.44	66.17	1826.74
	B/U	Equal	10	47.62	−0.65	9.55	0.19	1.25	52.70	86.62	2042.02

	C	Inward	108	9.09	−0.23	3.72	0.13	0.59	−56.03	−11.62	1689.26
Total		Outward	784	65.99	−0.08	10.99	0.14	0.69	54.12	19.07	1829.29
	B/U	Equal	296	24.92	−0.09	6.61	0.15	0.65	46.24	1.27	1796.19

Notes. This table presents key parameters for stars in different HC groups, categorised by their movement: churning (C) or blurring/undisturbed motion (B/U). Stars with nearly unchanged orbital radii (〈R_g〈 = 〈R_b〈 within a 2σ_tot threshold) are considered blurred or undisturbed (B/U). Stars with divergent orbital radii (〈R_g〈 and 〈R_b〈) beyond the same threshold are considered churned (C). Churned stars are further subdivided into those moving inward (〈R_g〈 < 〈R_b〈) and outward (〈R_g〈 > 〈R_b〈). For each group, the table shows the number of stars (N_★), the percentage of stars within the group (%), median metallicities ({[Fe/H])), median ages ( ${\bar{t}}_{⋆}$ $\overline{t}_{\star}$ ), median eccentricities (〈e〈), median maximum Galactic scale-heights (〈Z_max〈), and median angular momentum in the r, ϕ, and z directions (〈L_r4, 〈L_ϕ〈, 〈L_z〈).

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