Abstract
High quality spectra of interstellar absorption from C I toward β1 Sco, ρ Oph A, and χ Oph were obtained with the Goddard High Resolution Spectrograph on HST. Many weak lines were detected within the observed wavelength intervals: 1150-1200 Å for β1 Sco and 1250-1290 Å for ρ Oph A and χ Oph. Curve-of-growth analyses were performed in order to extract accurate column densities and Doppler parameters from lines with precise laboratory-based f-values. These column densities and b-values were used to obtain a self-consistent set of f-values for all the observed C I lines. A particularly important constraint was the need to reproduce data for more than one line of sight. For about 50% of the lines, the derived f-values differ appreciably from the values quoted by Morton.
Original language | English |
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Pages (from-to) | 820-827 |
Number of pages | 8 |
Journal | Astrophysical Journal |
Volume | 484 |
Issue number | 2 |
DOIs | |
State | Published - 1997 |
Externally published | Yes |
Keywords
- Atomic data
- ISM: Abundances
- Ultraviolet: ISM