S stars and s-process in the Gaia era - I. Stellar parameters and chemical abundances in a sub-sample of S stars with new MARCS model atmospheres

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Volume 620 (December 2018)

A&A, 620 (2018) A148

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Table 7

Sensitivity of the elemental abundances of NQ Pup upon variations of the atmospheric parameters.

Model	T_eff	log g	[Fe/H]	C/O	[s/Fe]	χ_t
	(K)	(cm s⁻²)	(dex)		(dex)	(km s⁻¹)
A	3700	1.0	−0.5	0.50	1.00	2.0
B	3600	1.0	−0.5	0.50	1.00	2.0
C	3800	1.0	−0.5	0.50	1.00	2.0
D	3700	0.0	−0.5	0.50	1.00	2.0
E	3700	1.0	0.0	0.50	1.00	2.0
F	3700	1.0	−0.5	0.50	1.00	1.5
G	3700	1.0	−0.5	0.75	1.00	2.0
H	3600	1.0	−0.5	0.75	1.00	2.0

Element	Δ _B−A	Δ _C−A	Δ _D−A	Δ_E−A	Δ_F−A	Δ_G−A	Δ_H−A

[N/Fe]	− 0.02	− 0.17	− 0.72	−0.21	−0.13	−1.05	−0.11
[Fe/H]	0.01	− 0.24	− 0.30	−0.20	−0.04	−0.16	0.00
[Y/Fe]	− 0.07	0.22	0.00	0.04	0.03	−0.04	−0.30
[Zr/Fe]	0.08	0.37	0.13	0.13	0.22	0.04	−0.02
[Nb/Fe]	0.03	0.17	0.13	0.03	0.02	0.11	0.09
[Ba/Fe]	− 0.26	− 0.11	−	−	−	0.01	−0.15
[La/Fe]	− 0.22	− 0.12	0.09	−0.16	−0.32	−0.50	−0.36
[Ce/Fe]	− 0.01	0.24	− 0.15	0.30	0.04	0.11	0.08
[Nd/Fe]	− 0.24	0.10	− 0.12	0.09	0.00	−0.16	−0.25
[Sm/Fe]	0.19	0.24	0.30	0.05	0.34	0.12	−0.16
[Eu/Fe]	0.17	0.31	0.48	0.38	0.22	0.46	−

Notes. A dash in the Δ column indicates that the agreement between the observed and the synthetic spectra was too poor and that the (unique) line usually providing the abundance for the considered element had to be rejected.

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