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Baltic Astronomy, vol. 14, XXXXXX, 2005. IMPROVED HE LINE FORMATION FOR EHE STARS
 

Summary: Baltic Astronomy, vol. 14, XXX­XXX, 2005.
IMPROVED HE LINE FORMATION FOR EHE STARS
N. Przybilla1
K. Butler2
U. Heber1
and C.S. Jeffery3
1
Dr. Remeis-Sternwarte Bamberg, Sternwartstr. 7, D-96049 Bamberg, Germany
2
Universit¨atssternwarte M¨unchen, Scheinerstr. 1, D-81679 M¨unchen, Germany
3
Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
Received 2005 July 31
Abstract. Quantitative analyses of extreme helium stars to date face the dif-
ficulty that theory fails to reproduce the observed helium lines in their entirety,
wings and line cores. Here, we demonstrate how the issues can be resolved
using state-of-the-art non-LTE line formation for these chemically peculiar ob-
jects. Two unique B-type objects are discussed in detail, the pulsating variable
V652Her and the metal-poor star HD 144941. The improved non-LTE compu-
tations for helium show that analyses assuming LTE or based on older non-LTE

  

Source: Armagh Observatory

 

Collections: Physics