SIMBAD references

2005ApJ...622.1044S - Astrophys. J., 622, 1044-1051 (2005/April-1)

The neon abundance of galactic Wolf-Rayet stars.


Abstract (from CDS):

The fast, dense winds that characterize Wolf-Rayet (W-R) stars obscure their underlying cores and complicate the verification of evolving core and nucleosynthesis models. Core evolution can be probed by measuring abundances of wind-borne nuclear-processed elements, partially overcoming this limitation. Using ground-based mid-infrared spectroscopy and the 12.81 µm [Ne II] emission line measured in four Galactic W-R stars, we estimate neon abundances and compare them to long-standing predictions from evolved-core models. For the WC star WR 121, this abundance is found to be ≳11 times the cosmic value, in good agreement with predictions. For the three less-evolved WN stars, little neon enhancement above cosmic values is measured, as expected. We discuss the impact of clumping in W-R winds on this measurement and the promise of using metal abundance ratios to eliminate sensitivity to wind density and ionization structure.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - Stars: Abundances - Stars: Wolf-Rayet - Techniques: Spectroscopic

Simbad objects: 10

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