The binary frequency of the OBN and OBC stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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62

Abundance, Atomic Spectra, Binary Stars, Line Spectra, Stellar Spectra, Boron, Carbon, Nitrogen, Oxygen Spectra, Periodic Variations, Tables (Data)

Scientific paper

Radial velocity measurements for a class of early-type stars having either enhanced carbon or nitrogen line strengths (termed OBCN stars) are undertaken to evaluate the binary frequency of the OBN and OBC subgroups. Between 50 and 100% of the OBN stars appear to be short-period binaries, while none of the OBC stars fall into this category. Mass-transfer evolution in binary systems may thus offer a reasonable explanation for the abundance anomalies exhibited by the OBN stars. The possibility that the OBN and OBC stars are kinematically distinct subgroups is also discussed.

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