WHT follow-up observations of extremely metal-poor stars identified from SDSS and LAMOST

D. S. Aguado; J. I. González Hernández; C. Allende Prieto; R. Rebolo

doi:10.1051/0004-6361/201730654

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Volume 605 (September 2017)

A&A, 605 (2017) A40

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Table 2

Stellar parameters and main results obtained from ISIS spectra.

Star	N _exp	⟨ S/N ⟩ ^a	T _eff	Δ T _eff	log g	Δ log g	[ Fe / H ]	Δ [ Fe / H ]	[ C / Fe ]	Δ [ C / Fe ]
	1800 s		[K]	[K]	[cm s^-2]	[cm s^-2]

SDSS J015131+163944	10	40	6032	33	4.8	0.07	–3.8	0.05	1.3	0.35
SDSS J030444+391021	6	44	5859	13	5.0	0.01	–4.0	0.05	<0.7	–
SDSS J105519+232234	4	39	6232	28	4.9	0.03	–4.0	0.07	<0.7	–
SDSS J132917+542027	2	82	6322	18	4.7	0.03	–2.7	0.02	<0.7	–
SDSS J134157+513534	2	76	6358	18	4.8	0.02	–3.5	0.03	<0.7	–
SDSS J134338+484426	2	287	5888	4	4.1	0.01	–3.3	0.01	0.8	0.09
SDSS J152202+305526	6	86	5865	15	4.0	0.04	–3.7	0.02	0.8	0.24
SDSS J173329+332941	12	51	6325	29	4.7	0.05	–3.4	0.04	1.8	0.08
SDSS J200513−104503	4	45	6361	38	4.6	0.06	–3.5	0.05	<0.7	–
SDSS J202109+601605	9	52	5973	28	4.7	0.07	–3.4	0.03	0.7	0.20
SDSS J204524+150825	4	61	5136	32	2.7	0.38	–3.8	0.02	0.3	0.28
SDSS J231027+231003	7	62	6213	20	4.4	0.05	–3.8	0.04	1.5	0.08
SDSS J222505+164322	6	50	5969	21	4.3	0.06	–3.4	0.04	0.8	0.39

HE 0233−0343¹	6	65	6150	16	4.9	0.02	–4.0	0.03	2.2	0.15
SDSS J1029+1729²	6	69	5845	13	5.0	0.01	–4.4	0.04	0.4 ^b	0.75
SDSS J1313−0019^3,4	7	66	5525	17	3.6	0.05	–4.7	0.03	2.8	0.03
HE 1327−2326^5,6	2	133	6101	11	4.3	0.02	–4.8	0.03	3.0	0.03
G64−12⁶	2	321	6377	5	4.8	0.01	–3.2	0.01	0.4 ^b	0.15
SDSS J1442−0015⁷	7	42	6036	31	4.9	0.08	–4.4	0.01	0.5 ^b	0.47

Notes. Δ is the internal uncertainty of the parameters derived with FERRE.

^(a)

Signal-to-noise ratios have been calculated as the average of S/N values for the entire SDSS spectrum.

^(b)

Values below our limit detection.

Reference.

⁽¹⁾

Hansen et al. (2014);

⁽²⁾

Caffau et al. (2012);

⁽³⁾

Allende Prieto et al. (2015);

⁽⁴⁾

Frebel et al. (2015);

⁽⁵⁾

Frebel et al. (2005);

⁽⁶⁾

Aoki et al. (2006);

⁽⁷⁾

Caffau et al. (2013).

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