The interstellar carbon abundance. II - Rho Ophiuchi and Beta Scorpii

Astronomy and Astrophysics – Astronomy

Scientific paper

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Abundance, Carbon, Interstellar Matter, Iue, Ophiuchi Clouds, Stellar Spectra, Ultraviolet Spectra, High Dispersion Spectrographs, Ultraviolet Astronomy, Ultraviolet Detectors

Scientific paper

The authors describe a procedure designed to obtain increased sensitivity from high-dispersion IUE spectra by using a flat-field spectrum to remove nonrandom noise due to the response pattern of the SEC vidicon detector. Application of this procedure to spectra of ρ Oph and β1Sco near the spin-forbidden interstellar λ2325 line of C II yields 2 σ upper limits on absorption of Wλ ⪉ 4 mÅ. The resulting depletion of carbon from the interstellar gas toward ρ Oph exceeds a factor of 1.4.

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