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Abundance analysis of HD 22920 spectra†

Published online by Cambridge University Press:  23 January 2015

Viktor Khalack  and
Patrick Poitras
Viktor Khalack
Affiliation:
Université de Moncton, Moncton, Canada email: [email protected]
Patrick Poitras
Affiliation:
Université de Moncton, Moncton, Canada email: [email protected]
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Abstract

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The new spectropolarimetric observations of HD 22920 with ESPaDOnS at CFHT reveal a strong variability of its spectral line profiles with the phase of stellar rotation. We have obtained Teff = 13640 K, logg=3.72 for this star from the best fit of its nine Balmer line profiles. The respective model of stellar atmosphere was calculated to perform abundance analysis of HD 22920 using the spectra obtained for three different phases of stellar rotation. We have found that silicon and chromium abundances appear to be vertically stratified in the atmosphere of HD 22920. Meanwhile, silicon shows hints for a possible variability of vertical abundance stratification with rotational phase.

Keywords

stars: atmospheresstars: chemically peculiarstars: abundancesstars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 383 - 384
Copyright
Copyright © International Astronomical Union 2015 

References

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