The atmospheres of helium-deficient Bp stars

Details The atmospheres of helium-deficient Bp stars The atmospheres of helium-deficient Bp stars

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006astl...32...54g&link_type=abstract

Astronomy Letters, vol. 32, Issue 1, p.54-68

Astronomy and Astrophysics

Astronomy

3

Pacs Numbers 97.10.Ld - 97.30.Fi

Scientific paper

Based on spectra taken with a 6-m telescope, we analyzed the abundances of chemical elements in the He-weak stars HD 21699 and HD 217833, estimated their surface magnetic fields (Bs = 4000 and 4500 G, respectively) from the magnetic intensification of spectral lines, and determined their microturbulences (V t = 0.80 and 0.75 km s-1, respectively). The low values of V t show that the stellar atmospheres are stabilized by a magnetic field, which explains the presence of diffusion processes that lead to chemical anomalies. Helium is strongly underabundant, and its deficiency is -1.50 and -1.81 dex in HD 21699 and HD 217833, respectively. We used model atmospheres to determine the effective temperatures, T eff = 16 000 and 15 450 K, and surface gravities, log g = 4.15 and 3.88, for the stars from the Hδ line, implying that they lie on the main sequence near the stars of luminosity class V.

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