The GAPS programme with HARPS-N at TNG - X. Differential abundances in the XO-2 planet-hosting binary

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Volume 583 (November 2015)

A&A, 583 (2015) A135

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Table 2

Differential elemental abundances for the XO-2 system.

Element	T_C^a	XO-2N^b	XO-2S^b	Δ[X/H]^c

[C/H]	40	0.41 ± 0.04	0.36 ± 0.05	0.050 ± 0.02
[N/H]	123	0.47 ± 0.05	0.49 ± 0.05	−0.020 ± 0.02
[O/H]	180	0.32 ± 0.03	0.27 ± 0.03	0.050 ± 0.02
[Na/H]	958	0.485 ± 0.043	0.445 ± 0.043	0.040 ± 0.011
[Mg/H]	1336	0.377 ± 0.051	0.333 ± 0.048	0.044 ± 0.011
[Al/H]	1653	0.440 ± 0.139	0.343 ± 0.141	0.097 ± 0.017
[Si/H]	1310	0.471 ± 0.082	0.419 ± 0.082	0.052 ± 0.010
[S/H]	664	0.530 ± 0.020	0.525 ± 0.025	0.005 ± 0.027
[Ca/H]	1517	0.365 ± 0.075	0.301 ± 0.065	0.064 ± 0.023
[Sc/H]	1659	0.462 ± 0.067	0.388 ± 0.060	0.074 ± 0.009
[Ti/H]^∗	1582	0.456 ± 0.096	0.351 ± 0.091	0.105 ± 0.030
[V/H]	1429	0.431 ± 0.060	0.329 ± 0.062	0.102 ± 0.013
[Cr/H]^∗	1296	0.423 ± 0.059	0.339 ± 0.054	0.084 ± 0.043
[Mn/H]	1158	0.576 ± 0.065	0.506 ± 0.074	0.070 ± 0.043
[Fe/H]^∗	1334	0.370 ± 0.072	0.315 ± 0.078	0.055 ± 0.013
[Co/H]	1352	0.524 ± 0.127	0.448 ± 0.126	0.076 ± 0.009
[Ni/H]	1353	0.538 ± 0.094	0.455 ± 0.096	0.083 ± 0.020
[Cu/H]	1037	0.627 ± 0.109	0.542 ± 0.107	0.085 ± 0.019
[Zn/H]	726	0.467 ± 0.044	0.427 ± 0.059	0.040 ± 0.023
[Y/H]	1659	0.472 ± 0.134	0.360 ± 0.110	0.112 ± 0.036
[Zr/H]	1741	0.460 ± 0.084	0.350 ± 0.084	0.110 ± 0.026
[Ba/H]	1455	0.410 ± 0.022	0.310 ± 0.049	0.100 ± 0.049
[La/H]	1578	0.530 ± 0.036	0.460 ± 0.022	0.070 ± 0.014
[Nd/H]	1602	0.547 ± 0.151	0.460 ± 0.147	0.087 ± 0.013
[Eu/H]	1356	0.520 ± 0.108	0.477 ± 0.104	0.043 ± 0.091

Notes.

^(a)

As condensation temperatures we considered the 50% T_C values derived by Lodders (2003) at a total pressure of 10^-4 bar.

^(b)

Abundances relative to the Sun.

^(c)

Abundances of XO-2N relative to XO-2S. Errors refer to the differential elemental abundances (see text).

^(∗)

Ti, Cr, and Fe abundances refer to the values obtained with the first ionization state.

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