Erratum to: Astrophysics Space Science (2011) 332:365

DOI 10.1007/s10509-010-0512-x

Equation (14) should read

$$H_{\mathrm{app}}(1\mu)/H_{\mathrm{integ}}(\omega_0,\mu)=1+\sum^{K_2}_{k=0}C_k(\omega_0)x^k $$

and hence Eq. (16) also needs to be corrected to

$$H_{\mathrm{app}}(\omega_0,\mu)=H_{\mathrm{app}}(1,\mu)/\Biggl[1+\sum^{K_2}_{k=0}C_k(\omega_0)x^k\Biggr] $$

We are grateful to Manuel Antonio Salgueiro da Silva for his suggestion which led us to locate the typesetting errors indicated above.