The most metal-poor tail of the Galactic halo: Hypothesis for its origin from precise spectral analysis

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Table A.3

Stellar parameters of the stars

Star	T_eff	log g	[Fe/H]	v_mic	[Mg/Fe]				age
(SIMBAD identifier)	[K]	[dex]	[dex]	[km/s]	1D LTE [dex]	1DNLTE [dex]	3DLTE [dex]	3D NLTE [dex]	[Gyr]
Precision Sample I

BD+24 1676	6433 ± 23	4.09 ± 0.04	−2.24 ± 0.05	1.35	0.26	0.24 ± 0.05	0.29	0.40	12.9 ± 0.5
BD-10 388	6285 ±19	3.90 ± 0.04	−2.22 ± 0.05	1.33	0.27	0.26 ± 0.05	0.30	0.41	12.1 ± 0.5
BPS CS22166-030	6203 ±130	3.76 ± 0.04	−3.16 ± 0.05	0	0.40	0.39 ± 0.11	0.44	0.52	13.2 ± 0.6
CD-35 14849	6380 ±10	4.37 ± 0.04	−2.15 ± 0.05	1.14	0.28	0.23 ± 0.06	0.30	0.40	$10.9 \pm_{1.4}^{1.3}$ $10.9 \pm _\frame{1.4}^\frame{1.3}$
BD+03 740	6388 ± 13	3.99 ± 0.04	−2.52 ± 0.05	1.22	0.19	0.17 ± 0.06	0.23	0.31	13.9 ± 0.6
BD-13 3442	6444 ± 6	4.00 ± 0.04	−2.61 ± 0.05	1.34	0.36	0.35 ± .0.06	0.40	0.49	13.0 ± 0.5
BD+26 2621	6436 ± 65	4.31 ± 0.04	−2.42 ± 0.05	1.08	0.22	0.21 ± 0.07	0.25	0.33	$11.9 \pm_{1.0}^{0.9}$ $11.9 \pm _\frame{1.0}^\frame{0.9}$
CD-33 1173	6617 ± 46	4.30 ± 0.04	−2.72 ± 0.05	0.76	0.27	0.26 ± 0.07	0.31	0.38	$11.2 \pm_{0.8}^{0.7}$ $11.2 \pm _\frame{0.8}^\frame{0.7}$
CD-71 1234	6427 ±13	4.28 ± 0.04	−2.23 ± 0.05	1.20	0.18	0.17 ± 0.05	0.21	0.30	$12.3 \pm_{1.0}^{0.8}$ $12.3 \pm _\frame{1.0}^\frame{0.8}$
HE 0926−0508	6457 ± 3	4.10 ± 0.04	−2.50 ± 0.05	1.09	0.43	0.30 ± 0.10	0.35	0.38	13.2 ± 0.5
LP 815−43	6538 ± 2	4.11 ± 0.04	−2.85 ± 0.05	1.10	0.41	0.40 ± 0.06	0.46	0.52	11.1 ± 0.4
LP 831−70	6389 ±16	4.48 ± 0.04	−2.84 ± 0.05	0.50	0.52	0.51 ± 0.06	0.56	0.62	$8.7 \pm_{18}^{2.0}$ $8.7 \pm _\frame{18}^\frame{2.0}$
UCAC2 20056019	6401 ± 25	3.93 ± 0.03	−2.64 ± 0.05	0.50	0.25	0.24 ± 0.16	0.28	0.36	12.1 ±0.7
Wolf 1492	6572 ± 44	4.29 ± 0.04	−3.04 ± 0.05	0.50	0.44	0.43 ± 0.16	0.48	0.54	13.6 ± 0.7
HD 140283	5805 ± 11	3.67 ± 0.02	−2.30 ± 0.05	1.17	0.19	0.14 ± 0.05	0.21	0.31	13.8 ± 0.55
BPS BS 16023−046	6502 ± 7	4.25 ± 0.05	−2.78 ± 0.09	0.80	0.15	0.14 ± 0.22	0.20	0.26	${13.1}_{1.3}^{1.0}$ $13.11_\frame{1.3}^\frame{1.0}$
BPS BS 16968−061	6252 ±12	3.79 ± 0.03	−2.79 ± 0.11	0.80	0.36	0.34 ± 0.15	0.40	0.48	12.4 ± 0.6
BPS CS 22177−009	6353 ± 74	4.38 ± 0.04	−2.99 ± 0.15	0.80	0.39	0.38 ± 0.20	0.44	0.50	$12.4 \pm_{1.8}^{1.2}$ $12.4 \pm _\frame{1.8}^\frame{1.2}$
BPS CS 22953−037	6510±9	4.16 ± 0.03	−2.83 ± 0.11	0.80	0.51	0.50 ± 0.13	0.55	0.63	13.7 ± 0.5
BPS CS 29518−043	6519 ±15	4.18 ± 0.05	−3.15 ± 0.13	0.80	0.54	0.53 ± 0.24	0.59	0.65	13.9 ± 0.5

Precision Sample II

BPS BS 17569−049	4794 ± 6	1.04 ± 0.15	−2.53 ± 0.13	1.70	0.50	0.34 ± 0.13	0.54	—	—
BPS CS 22953−003	5160 ±12	1.95 ± 0.15	−2.55 ± 0.13	0.90	0.17	0.12 ± 0.14	0.10	—	—
HD 186478	4793 ± 22	1.59 ± 0.15	−2.25 ± 0.09	1.40	0.64	0.35 ± 0.10^⋆	0.63	—	—
BD+09 2870	4724 ± 1	1.38 ± 0.15	−2.22 ± 0.08	1.10	0.57	0.19 ± 0.10^⋆	0.45	—	—
BD-18 5550	4981 ± 85	1.83 ± 0.15^◊	−2.63 ± 0.10	1.30	0.26	0.20 ± 0.11	0.22	—	—
BPS CS 22186−025	5042 ±14	1.69 ± 0.15	−2.67 ± 0.10	1.70	0.36	0.31 ± 0.12	0.38	—	—
BPS CS 22891−209	4835 ± 43	0.93 ± 0.15^◊	−3.01 ± 0.08	1.40	0.37	0.34 ± 0.09	0.32	—	—
BPS CS 22896−154	5288 ± 25	2.61 ± 0.15	−2.46 ± 0.08	0.80	0.34	0.27 ± 0.10	0.28	—	—
BPS CS 22956−050	5028 ± 32	1.75 ± 0.15	−3.07 ± 0.07	1.20	0.46	0.43 ± 0.09	0.42	—	—
BPS CS 22966−057	5536 ± 40	3.36 ± 0.15	−2.23 ± 0.08	0.90	0.33	0.27 ± 0.09	0.30	—	—
BPS CS 29491−053	4834 ± 38	1.56 ± 0.15	−2.76 ± 0.08	1.30	0.46	0.37 ± 0.09	0.40	—	—
BPS CS 29518−051	5339 ± 6	2.68 ± 0.15^◊	−2.36 ± 0.07	1.10	0.31	0.23 ± 0.08	0.28	—	—
HD 122563	4627 ±13	1.09 ± 0.15	−2.59 ± 0.09	1.20	0.43	0.20 ± 0.09	0.34	—	—

Gaia-ESO sample

GESJ17543319-4110487	5108 ±21	1.90 ± 0.25	−2.97 ± 0.11	0.90	0.43	0.40 ± 0.32	0.39	—	—
GESJ17545552-3803393	4748 ± 20	1.10 ± 0.25	−3.16 ± 0.24	1.20	0.26	0.24 ± 0.37	0.21	—	—
GESJ17574658-3847500^⋆	5251 ± 306	2.10 ± 0.25	−2.43 ± 0.15	1.50	0.39	0.29 ± 0.36	0.36	—	—
GESJ18185545-2738118^⋆	4921 ± 197	1.90 ± 0.25	−2.68 ± 0.18	1.20	0.35	0.28 ± 0.42	0.31	—	—
GESJ18215385-3410188	4925 ± 10	1.10 ± 0.25	−2.34 ± 0.04	1.35	0.66	0.45 ± 0.09	0.62	—	—
GESJ18261627-3154272	4924 ± 132	1.50 ± 0.25	−2.05 ± 0.11	1.20	0.74	0.36 ± 0.15	0.70	—	—
GESJ18265160-3159404^⋆	4586 ±102	1.00 ± 0.25	−2.82 ± 0.02	1.80	0.46	0.31 ± 0.09	0.48	—	—
GESJ18361733-2700053	4818 ± 65	2.05 ± 0.25	−2.52 ± 0.06	1.10	0.35	0.27 ± 0.08	0.29	—	—
GESJ18370372-2806385	4878 ±122	1.50 ± 0.25	−2.20 ± 0.04	1.10	0.60	0.22 ± 0.14^⋆	0.50	—	—
GESJ18374490-2808311	4627 ± 99	1.00 ± 0.25	−2.00 ± 0.16	1.40	0.23	0.12 ± 0.58	0.20	—	—
GESJ01293652-5020327^‡	6368 ± 35	3.00 ± 0.25	−2.18 ± 0.20	0.70	0.17	0.14 ± 0.50	0.14	—	—
GESJ03372526-2724127^⋆	5816 ±61	3.70 ± 0.25	−2.18 ± 0.07	1.20	0.37	0.32 ± 0.16	0.37	0.50	$13.5 \pm_{1.2}^{1.0}$ $13.5 \pm _\frame{1.2}^\frame{1.0}$
GESJ09475504-1027247^⋆	5403 ± 64	3.20 ± 0.25	−2.53 ± 0.05	1.20	0.36	0.29 ± 0.09	0.38	—	—
GESJ10091577-4127155^⋆	5361 ±100	3.00 ± 0.25	−2.30 ± 0.10	1.30	0.35	0.26 ± 0.12	0.35	—	—
GESJ10142785-4052503^⋆	5201 ±102	2.40 ± 0.25	−2.46 ± 0.06	1.60	0.79	0.64 ± 0.09	0.78	—	—
GESJ10580638-1542390	4838 ± 53	1.60 ± 0.25	−2.27 ± 0.08	1.50	0.23	0.09 ± 0.09	0.24	—	—
GESJ12555146-4507342^⋆	5057 ± 73	1.50 ± 0.25	−2.45 ± 0.07	1.50	0.36	0.27 ± 0.19	0.35	—	—
GESJ14214860-4408399^⋆	4674 ± 69	1.10 ± 0.25	−2.41 ± 0.10	1.30	0.46	0.25 ± 0.12	0.40	—	—
GESJ14410090-4007413	4926 ± 43	1.50 ± 0.25	−2.41 ± 0.03	1.50	0.49	0.27 ± 0.09	0.47	—	—
GESJ15300154-2005148	5811 ± 65	2.20 ± 0.25	−1.94 ± 0.07	1.60	0.39	0.31 ± 0.09	0.33	—	—
GESJ22125747-4539203	5500 ± 62	3.40 ± 0.25	−2.12 ± 0.06	1.30	0.32	0.24 ± 0.16	0.31	—	—
GESJ22494718-5001048	6302 ± 25	3.90 ± 0.25	−2.42 ± 0.17	1.50	0.40	0.37 ± 0.40	0.45	0.57	$13.5 \pm_{1.0}^{0.9}$ $13.5 \pm _\frame{1.0}^\frame{0.9}$

Notes. The second part of the table lists the atmospheric parameters of the TITANS II giants Giribaldi et al. (2023). Unlike the original source, here [Fe/H] is derived fully under NLTE and therefore our values are slightly different. Surface gravity values accompanied by the symbol (?) are slightly different to those in Giribaldi et al. (2023) (see main text in Sect. 3). Stars accompanied by with the symbol (⋆) indicate T_eff determined only with Gaia colour calibrations. The star accompanied by the symbol (‡) has unreliable atmospheric parameters, see main text in Sect. 3. Magnesium-to-iron ratios indicated with the symbol (♠) indicate uncertain values according to the analysis in Sect. 4.1.

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