5 Discussion

  

Table 6: Comparison of derived and solar abundances

Table 6 compares the derived abundances for HD 133029 and HD 192913 with solar values (Grevesse et al. 1996). Also given are the abundances of HD 43819 (Lopez-Garcia & Adelman 1994). Compared with the Sun, the light elements of the silicon stars are mostly solar except for Si, and all the heavier elements except nickel in HD 133029, which is solar, are greatly overabundant. HD 133029 has underabundant C, Mg, and S and overabundant Ca while HD 192913 underabundant Mg. The iron peak elements are typically 10 times overabundant except Cr in HD 133029 which is 100 times solar, Mn in HD 192913 which is of order 100 times solar, and Ni which is highly variable. SrYZr are of order 100 times solar when observed. The rare earths are 1000 or more times overabundant. HD 43819 appears to be in general a slightly less metal rich star than the other two silicon stars.

For a substantial confrontation with theory, we need to analyze additional magnetic CP stars with higher signal-to-noise spectra. This will also give additional information on the line-to-line magnetic intensification. We need to extend the range of effective temperatures to look for temperature dependences and for theoretical tests.

Acknowledgements

ZLG thanks the Director of CASLEO for the use of their facilities in connection with this project. Her research was support by a grant from the CICYTCA, UNSJ. SJA acknowledges partial support from grants from The Citadel Development Foundation. Both authors appreciate Drs. R.L. Kurucz and I. Hubeny for making their codes available to them, and Mrs. C. Puigdengolas for partial measurement of the equivalent widths.