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Looking for Twins of Przybylski’s Star

  • S. Hubrig (a1), C.R. Cowley (a2), S. Bagnulo (a1), G. Mathys (a1), A. Ritter (a3) and G.M. Wahlgren (a4)...

Abstract

The examination of high resolution spectra of two Ap stars, HD 965 and HD 217522, discloses a spectral appearance similar to Przybylski’s star. Here we present the preliminary results of a comparative study of all three stars. Further, we discuss the possibility of having a good spectroscopic indicator of magnetic fields in Ap stars. In all three studied stars the strong Lu II line at λ 5984 Å is present and very likely not affected by significant blends. Its hyperfine structure has been recently measured and we show the results of a model that accounts for the Paschen-Back effect on hyperfine structure.

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Copyright

References

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Cowley, C.R., Hubrig, S., Ryabchikova, T.A., Mathys, G., Piskunov, N., & Mittermayer, P. 2001, A&A, 367, 939
Cowley, C.R., & Mathys, G. 1998, A&A, 339, 165
Cowley, C.R., Ryabchikova, T., Kupka, F., Bord, D.J., Mathys, G., & Bidel-man, W.P. 2000, MNRAS, 317, 299
Hubrig, S., Kharchenko, N., Mathys, G., & North, P. 2000, A&A, 355, 306
Kurucz, R.L. 1993, Kurucz CD-ROM No. 2 & No. 13 (Cambridge: SAO)
Kurtz, D.W. 1980, MNRAS, 191, 115
Kurtz, D.W., & Wegner, G. 1979, ApJ, 232, 510
Mathys, G., & Hubrig, S. 1997, A&AS, 124, 475
Mathys, G., Manfroid, J., & Wenderoth, E. 2002, in preparation

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