Spectrophotometry of the He-weak star HD 217833

Details Spectrophotometry of the He-weak star HD 217833 Spectrophotometry of the He-weak star HD 217833

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mast.conf..198g&link_type=abstract

Magnetic stars, Proceedings of the International Conference, held in the Special Astrophysical Observatory of the Russian AS, Au

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Chemically Peculiar, Magnetic Fields, Spectrophotometry, Hd 217833

Scientific paper

Using spectra obtained at the 6 m telescope, the chemical composition was measured, an estimate of the strength of the surface magnetic field, Bs = 4500 G, was made from magnetic intensification of spectral lines, and the turbulent velocity value, Vt = 0.75 ± 1.00 km/s, was derived. The small value of Vt may indicate that the atmosphere of the star is stabilized by the magnetic field, which explains the presence of diffusion processes causing chemical anomalies. Fe has slight excess (0.6 dex), He is strongly deficient, N(He)/N(H) = 0.001. Seemingly, this star can be classified as an extreme He-deficient one. Another characteristic distinction of HD 217833 is the presence of strong and numerous chromium lines in its spectrum, which are not observed in the spectrum of normal stars. At the same time the doublet SiI I λ4128 Å and λ4131 Å have an approximately the same intensity as a normal star. The model atmosphere method was used to obtain the temperature Te = 16000K and the acceleration of gravity lg g = 3.88, which correspond to the position of the star on the main sequence between the ZAMS and V luminosity class stars.

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