Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..224..652i&link_type=abstract
The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004. Edited by J. Zverko, J. Ziznovsky, S.J. Adelman, and W.W. Weiss,
Physics
Techniques: Spectroscopic, Stars: Atmospheres, Stars: Chemically Peculiar, Stars: Individual (Hd 31295, Hd 91130, Hd 110411, Hd 125162, Hd 183324, Hd 192640, Hd 221756).
Scientific paper
High S/N high-resolution spectroscopic observations of seven bright well-known λ Bootis stars: HD 31295, HD 91130, HD 110411, HD 125162, HD 183324, HD 192640, and HD 221756 are presented. Sharp absorption details observed in the bottoms of the Na-D lines in HD 192640 and HD 221756 do not show any radial velocity changes with an accuracy up to 1 km s-1. They are of interstellar origin. Manifestations of non-radial pulsation reported earlier in literature are observed both in the Na-D and the Hα line profiles. The Inglis-Teller formula was used to evaluate the electron density in the upper atmospheric layers (τ ˜ 0.1). The values obtained for log{Ne} are typical for normal A stars with similar effective temperatures and spectral classes.
Barzova I.
Iliev Ilian Kh.
Paunzen E. E.
Stateva I.
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