Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136..331h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 2, July 1984, p. 331-337.
Astronomy and Astrophysics
Astronomy
27
Abundance, Nonequilibrium Thermodynamics, O Stars, Stellar Atmospheres, Stellar Spectra, Subdwarf Stars, Atmospheric Models, Carbon, Helium, Nitrogen, Silicon, Stellar Composition, Ultraviolet Astronomy
Scientific paper
An analysis of the ultraviolet (1150-2000 A) and the blue 4000-5100 A) spectra of the subdwarf O-star Feige 110 is presented. Effective temperature, gravity and helium abundance of Feige 110 are determined on the basis of NLTE model atmospheres. The effective temperature of Feige 110 is found to be 40,000 K (+5000 or -3000 K). Helium abundances in the star were deficient, between 1 and 6 percent. The abundances of carbon and nitrogen were obtained from the ultraviolet resonance lines C IV and N V. The nitrogen abundance was found to be close to that of the sun but carbon was extremely deficient. Si IV resonance lines were absent in the UV spectrum of Feige 110. It is suggested that the abundance pattern of Feige 110 may have been affected by diffusion, and that, therefore, the photospheric abundance of helium, carbon, and silicon may have been larger before the onset of diffusion.
Hamann Wolf-Rainer
Heber Uli
Hunger Kurt
Kudritzki Rolf Peter
Mendez Roberto H.
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