AAS 206th Meeting, 29 May - 2 June 2005
Session 35 Stars
Poster, Wednesday, 10:00am-7:00pm, Thursday, 9:20am-2:00pm, June 1, 2005, Ballroom A

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[35.08] Terbium in HD 101065 (Przybylski's Star)

S. L. Seagraves, D. J. Bord (UM-Dearborn), G. M. Wahlgren (ULund)

HD 101065 (Przybylski’s star) is a rapidly oscillating Ap star whose spectrum is dominated by lines of singly and doubly ionized lanthanide rare-earth elements. The logarithmic abundance ratios of Nd III/Nd II and Pr III/Pr II are of the order of 1.0 dex, indicating a violation of LTE ionization balance. We have identified features in the spectrum of this star attributable to Tb III and have established the abundance of this ion by spectrum synthesis techniques including hyperfine effects. We find that the previously observed ionization dis-equilibrium extends to terbium with log (NTb III/ NTb II) = 1.2. This result continues the trend established by the other rare-earths in this unusual star and invites explanation in terms of atmospheric stratification, NLTE effects, or both.

The author(s) of this abstract have provided an email address for comments about the abstract: dbord@umd.umich.edu

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Bulletin of the American Astronomical Society, 37 #2
© 2005. The American Astronomical Soceity.