4 Results

For spectrum synthesis the only molecule added was CN ($\mbox{A}^2\Pi-\mbox{X}^2\Sigma$), which was applied in the infrared part of Arcturus spectrum. The mean parameters (the effective temperature, the gravity, the microturbulent velocity and the metallicity) obtained in this work are given in Table 2.

 

Table 2: Derived atmosphere parameters of program stars

 

4.1 $\alpha$ Ari

Results of the FFT optimization described in Sect. 3.3.2 in each wavelength interval are given in Table 3. Parameters of $\alpha$ Ari determined by other authors are given in Table 4.

 

Table 3: Derived atmosphere parameters of $\alpha$ Ari

 

 

Table 4: Available determinations of atmosphere parameters of $\alpha$ Ari

 

A comparison of the results indicated by the program ATLAS9 and POSMARCS shows negligible differences.

4.2 $\alpha$ Boo

The derived parameters obtained in each wavelength interval are summarized in Table 5. The spectra from Wallace & Hinkle (1996) were fitted using the direct method (Sect. 3.3.1), and spectra from Horn et al. (1996) were fitted by means of the FFT method (Sect. 3.3.2). The parameters finally obtained are given in Table 2, except the rotational velocity which is equal to $6.4\pm 0.7\,\mathrm{km}\,\mathrm{s}^{-1}$.

 

Table 5: Derived atmosphere parameters of $\alpha$ Boo

 

The parameters of $\alpha$ Boo taken from the quoted articles are summarized in Table 6. The metallicity obtained in this work is slightly higher than that determined by other authors.

 

Table 6: Parameters of $\alpha$ Boo, available in the quoted articles

 

4.3 $\alpha$ Cas

  Results of the FFT optimization in each interval are given in Table 7. Parameters of $\alpha$ Cas determined by other authors are given in Table 8.

 

Table 7: Derived atmosphere parameters of $\alpha$ Cas. Spectra in the first row are taken from Horn et al. (1996), and the rest is taken from ,Stefl (1985, 1994)

 

 

Table 8: Parameters of $\alpha$ Cas obtained from the literature

 

4.4 $\beta$ Gem

  Results of optimization in individual intervals are given in Table 9. The parameters of $\beta$ Gem available in the quoted literature are given in Table 10.

 

Table 9: Derived atmosphere parameters of $\beta$ Gem

 

 

Table 10: Parameters of $\beta$ Gem, taken from the literature