Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118...39h&link_type=abstract
Astronomy and Astrophysics, vol. 118, no. 1, Feb. 1983, p. 39-56. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
59
B Stars, Fine Structure, Spectrum Analysis, Stellar Atmospheres, Stellar Spectra, Ultraviolet Spectra, Visible Spectrum, Abundance, Carbon, Helium, Hydrogen, Linear Energy Transfer (Let), Magnesium, Nitrogen, Stellar Evolution, Stellar Mass, Stellar Temperature
Scientific paper
Line blanketed linear transfer of energy (LTE) model atmospheres were used to analyze UV and visual spectra of the extreme He star BD +10.2179. Model inputs included a temperature within 600 K of 16,000 K, an He component totaling 0.989, and a microturbulent velocity within 1.5 km/sec of 7 km/sec. Hydrogen abundance was calculated to be 0.1% by number, and the star displayed metal abundances very different from that of the sun. C and Mg were found to be overabundant, nitrogen content is close to that of the sun, and an oxygen shortage was projected. A less than one solar mass is indicated, together with a radius within 1.7 solar radius of 6.6 solar radii, and a process of evolution toward white dwarf star is indicated. Finally, the evolutionary directions of other He stars are discussed.
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