Chemical homogeneity in the Orion Association: Oxygen abundances of B stars

K. Cunha, Ivan - Hubeny, T. Lanz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We present non-LTE oxygen abundances for a sample of B stars in the Orion association. The abundance calculations included non-LTE line formation and used fully blanketed non-LTE model atmospheres. The stellar parameters were the same as adopted in the previous study by Cunha & Lambert (1994). We find that the young Orion stars in this sample of 10 stars are described by a single oxygen abundance with an average value of A(O) = 8.78 and a small dispersion of ±0.05, dex which is of the order of the uncertainties in the analysis. This average oxygen abundance compares well with the average oxygen abundance obtained previously in Cunha & Lambert (1994): A(O) = 8.72 ± 0.13 although this earlier study, based upon non-blanketed model atmospheres in LTE, displayed larger scatter. Small scatter of chemical abundances in Orion B stars had also been found in our previous studies for neon and argon; all based on the same effective temperature scale. The derived oxygen abundance distribution for the Orion association compares well with other results for the oxygen abundance in the solar neighborhood.

Original languageEnglish (US)
Title of host publicationEPJ Web of Conferences
Volume19
DOIs
StatePublished - 2012
EventInternational Conference on Assembling the Puzzle of the Milky Way - Le Grand-Bornand, France
Duration: Apr 17 2011Apr 22 2011

Other

OtherInternational Conference on Assembling the Puzzle of the Milky Way
CountryFrance
CityLe Grand-Bornand
Period4/17/114/22/11

Fingerprint

B stars
homogeneity
oxygen
atmospheres
stars
solar neighborhood
temperature scales
local thermodynamic equilibrium
neon
argon

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Chemical homogeneity in the Orion Association : Oxygen abundances of B stars. / Cunha, K.; Hubeny, Ivan -; Lanz, T.

EPJ Web of Conferences. Vol. 19 2012. 08005.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Cunha, K, Hubeny, I & Lanz, T 2012, Chemical homogeneity in the Orion Association: Oxygen abundances of B stars. in EPJ Web of Conferences. vol. 19, 08005, International Conference on Assembling the Puzzle of the Milky Way, Le Grand-Bornand, France, 4/17/11. https://doi.org/10.1051/epjconf/20121908005
Cunha, K. ; Hubeny, Ivan - ; Lanz, T. / Chemical homogeneity in the Orion Association : Oxygen abundances of B stars. EPJ Web of Conferences. Vol. 19 2012.
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