Abundance analyses of roAp stars - VI. 10 Aql and HD 122970

In this sixth paper in a sequence on abundance analyses of roAp stars we pr esent the results for two further members of this group, which are fairly s imilar and have only a small magnetic field. The analysis of 10 Aql and HD 122970 did not require, for the first time in this long term project, the d evelopment of tools and hence was rather straight-forward. We reanalyzed Sm , Eu and Gd in HD 203932, because better atomic parameters have become avai lable with VALD-2; and for Eu we also took hyperfine-structure effects into account. Similar to the five roAp stars analysed so far (alpha Cir: Kupka et al. 199 6, HD 203932: Gelbmann et al. 1997, gamma Equ: Ryabchi- kova et al. 1997a, HD 24712: Ryabchikova et al. 1997b, and HD 166473: Gelbmann ct al. 2000) we find nearly solar abundances of Fe and Ni, and a definite overabundance of Cr and especially Co, with large overabundances of rare earth elements. Th is pattern seems to be a common property of chemically peculiar (CP2, Ap) s tars. HD 101065 (Przybylski's star), another roAp star, has a similar pecul iarity pattern, except of iron (Cowley et al. 2000) which is underabundant. 10 Aql and HD 122970 provide another example for the anomalous line strengt hs of the second ions of rare earth elements resulting in an abundance incr ease of up to 2 dex (!) compared to values obtained from lines of the first ions. As we mentioned in an earlier paper, this anomaly yet is not found i n non-roAp and "normal" stars.