Table 3: Abundance results for the subgiant stars. Number of transitions used to derive the abundances of the different elements ( N), mean values ( $\langle\rangle$) and error bars, corresponding to 1$\sigma $ of the atmospheric parameters and abundances, as determined from Methods 1, 2 and 3. The notation is the usual one: $[A/B]=\log [A/B]_{\star}-\log [A/B]_{\odot}$.
  HD 23249 ($\delta $ Eri) HD 198149 ($\eta$ Cep)
  Method 1 Method 2 Method 3 Method 1 Method 2 Method 3
  N $\langle\rangle$ N $\langle\rangle$ N $\langle\rangle$ N $\langle\rangle$ N $\langle\rangle$ N $\langle\rangle$
$T_{\rm eff}$ (K)   $ 5140\pm105$   $4982\pm180$   $5140\pm50$   $5080\pm137$   $4889\pm181 $   $5085\pm80$
log g (cm s-2)   $4.10\pm0.26$   $3.80\pm0.28$   $4.10\pm0.25$   $3.66\pm0.22$   $3.27\pm0.26$   $3.68\pm0.19$
$\xi$ (km s-1)   $1.32\pm0.18$   $1.36\pm0.30$   $1.25\pm0.15$   $1.09\pm0.10$   $1.20\pm0.28$   $1.13\pm0.12$
$v\sin i$ (km s-1)           3.0           3.3
${\rm [Fe/H]}$ 38 $0.05\pm0.13$ 34 $-0.05\pm0.19$ 34 $0.06\pm0.14$ 38 $-0.12\pm0.14$ 34 $-0.25\pm0.19$ 34 $-0.12\pm0.14$
${\rm [O/Fe]}$ 3 $0.14\pm0.10$ 3 $0.29\pm0.12$ 3 $0.09\pm0.16$ 3 $0.17\pm0.10$ 3 $0.42\pm0.12$ 3 $0.17\pm0.08$
${\rm [Na/Fe]}$ 1 $0.30\pm0.05$ 1 $0.31\pm0.12$ 1 $0.29\pm0.03$ 1 $0.07\pm0.08$ 1 $0.08\pm0.11$ 1 $0.07\pm0.04$
${\rm [Mg/Fe]}$ 1 $-0.10\pm0.03$ 1 $-0.07\pm0.11$ 1 $-0.10\pm0.03$ 1 $-0.05\pm0.04$ 1 $-0.02\pm0.11$ 1 $-0.05\pm0.04$
${\rm [Al/Fe]}$ 2 $0.10\pm0.03$ 2 $0.14\pm0.09$ 1 $0.10\pm0.05$ 1 $0.06\pm0.08$ 1 $0.08\pm0.11$ 1 $0.06\pm0.05$
${\rm [Si/Fe]}$ 7 $0.11\pm0.09$ 7 $0.19\pm0.09$ 7 $0.11\pm0.10$ 7 $0.15\pm0.20$ 7 $0.24\pm0.20$ 7 $0.15\pm0.20$
${\rm [Ca/Fe]}$ 3 $0.08\pm0.14$ 3 $0.08\pm0.15$ 3 $0.10\pm0.14$ 3 $0.08\pm0.13$ 3 $0.06\pm0.23$ 3 $0.09\pm0.10$
${\rm [Sc/Fe]}$ 1 $0.25\pm0.12$ 1 $0.16\pm0.19$ 1 $0.24\pm0.14$ 1 $0.10\pm0.15$ 1 $0.01\pm0.18$ 1 $0.10\pm0.08$
${\rm [Ti/Fe]}$ 1 $0.07\pm0.07$ 1 $0.05\pm0.17$ 1 $0.07\pm0.05$ 1 $-0.05\pm0.11$ 1 $-0.07\pm0.14$ 1 $-0.05\pm0.06$
${\rm [Cr/Fe]}$ 2 $-0.02\pm0.13$ 2 $-0.03\pm0.12$ 1 $-0.01\pm0.16$ 1 $-0.07\pm0.10$ 1 $-0.10\pm0.20$ 1 $-0.06\pm0.08$
${\rm [Co/Fe]}$ 1 $0.16\pm0.10$ 1 $0.13\pm0.18$ 1 $0.16\pm0.12$ 1 $0.16\pm0.10$ 1 $0.12\pm0.17$ 1 $0.17\pm0.07$
${\rm [Ni/Fe]}$ 5 $0.07\pm0.14$ 5 $0.08\pm0.15$ 5 $0.08\pm0.17$ 5 $0.02\pm0.12$ 5 $0.02\pm0.17$ 5 $0.03\pm0.11$
${\rm [Ba/Fe]}$ 1 $-0.06\pm0.24$ 1 $-0.20\pm0.19$ 1 $-0.02\pm0.26$ 1 $0.05\pm0.21$ 1 $-0.15\pm0.18$ 1 $0.05\pm0.15$
${\rm [\alpha/Fe]}$   $0.04\pm0.05$           $0.03\pm0.07$        

  HD 222404 ($\gamma$ Cep)
  Method 1 Method 2 Method 3
  N $\langle\rangle$ N $\langle\rangle$ N $\langle\rangle$
$T_{\rm eff}$ (K)   $4935\pm139$   $4781\pm179$   $5020\pm115$
log g (cm s-2)   $3.63\pm0.38$   $3.22\pm0.42$   $3.85\pm0.27$
$\xi$ (km s-1)   $1.41\pm0.17$   $1.56\pm0.26$   $1.26\pm0.17$
$v\sin i$ (km s-1)           3.0
${\rm [Fe/H]}$ 38 $0.14\pm0.19$ 34 $0.01\pm0.23$ 34 $0.22\pm0.25$
${\rm [O/Fe]}$ 3 $0.04\pm0.31$ 3 $0.24\pm0.30$ 3 $-0.06\pm0.15$
${\rm [Na/Fe]}$ 1 $0.06\pm0.08$ 1 $0.09\pm0.13$ 1 $0.05\pm0.07$
${\rm [Mg/Fe]}$ 1 $-0.03\pm0.05$ 1 $0.02\pm0.12$ 1 $-0.06\pm0.06$
${\rm [Al/Fe]}$ 1 $0.12\pm0.09$ 1 $0.14\pm0.15$ 1 $0.10\pm0.12$
${\rm [Si/Fe]}$ 7 $0.10\pm0.20$ 7 $0.19\pm0.20$ 7 $0.05\pm0.09$
${\rm [Ca/Fe]}$ 3 $-0.09\pm0.18$ 3 $-0.13\pm0.29$ 3 $-0.06\pm0.15$
${\rm [Sc/Fe]}$ 1 $0.40\pm0.24$ 1 $0.32\pm0.27$ 1 $0.45\pm0.26$
${\rm [Ti/Fe]}$ 1 $-0.02\pm0.12$ 1 $-0.03\pm0.18$ 1 $-0.02\pm0.14$
${\rm [Cr/Fe]}$ 1 $-0.08\pm0.15$ 1 $-0.12\pm0.27$ 1 $-0.04\pm0.11$
${\rm [Co/Fe]}$ 1 $0.31\pm0.17$ 1 $0.28\pm0.23$ 1 $0.35\pm0.19$
${\rm [Ni/Fe]}$ 5 $-0.02\pm0.18$ 5 $-0.03\pm0.22$ 5 $0.00\pm0.15$
${\rm [Ba/Fe]}$ 1 $-0.30\pm0.27$ 1 $-0.51\pm0.54$ 1 $-0.13\pm0.17$
${\rm [\alpha/Fe]}$   $-0.01\pm0.07$        


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