Boron abundances of B stars of the Orion association

Katia Cunha, David L. Lambert, Michael Lemke, Douglas R. Gies, Lewis C. Roberts

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25 Scopus citations


The boron abundance of four B-type stars from the Orion association has been determined from Goddard High Resolution Spectrograph (GHRS)/Hubble Space Telescope (HST) spectra covering the B II 1362 Å resonance line. After correction for large non-LTE effects, the mean boron abundance is similar to the meteoritic abundance, but a factor of 4 (0.6 dex) greater than published abundances of boron in interstellar gas. This difference in boron abundance between young stars and gas is unexplained. The Orion stars were selected by their oxygen abundances: two are enriched in oxygen by about 60% relative to the others. Analysis of the GHRS spectra shows that the O-rich stars are deficient in boron by about 250% (0.4 dex) relative to the O-poor stars. Then, if the differences in oxygen abundance reflect differing levels of contamination of the natal clouds with (O-rich) ejecta of local Type II supernovae, the ejecta were not enriched in boron synthesized by the v-process.

Original languageEnglish (US)
Pages (from-to)211-224
Number of pages14
JournalAstrophysical Journal
Issue number1 PART I
StatePublished - 1997
Externally publishedYes


  • Open clusters and associations: individual (Orion)
  • Stars: abundances
  • Stars: early-type
  • Ultraviolet: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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