학술논문
Spectral analysis of the sdO standard star Feige 34
Document Type
Working Paper
Author
Source
Subject
Language
Abstract
We present our current work on the spectral analysis of the hot sdO star Feige 34. We combine high S/N optical spectra and fully-blanketed non-LTE model atmospheres to derive its fundamental parameters (Teff, log g) and helium abundance. Our best fits indicate Teff =63 000 K, log g=6.0 and log N(He)/N(H)=-1.8. We also use available ultraviolet spectra (IUE and FUSE) to measure metal abundances. We find the star to be enriched in iron and nickel by a factor of ten with respect to the solar values, while lighter elements have subsolar abundances. The FUSE spectrum suggests that the spectral lines could be broadened by rotation.
Comment: to be published by Astronomical Society of the Pacific Conference Series in the proceedings of the "20th European Workshop on White Dwarfs"
Comment: to be published by Astronomical Society of the Pacific Conference Series in the proceedings of the "20th European Workshop on White Dwarfs"