Atomic physics with the goddard high resolution spectrograph on the Hubble Space Telescope. V. Oscillator strengths for neutral carbon lines below 1200 Å

S. R. Federman, J. Zsargó

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We analyzed high-resolution spectra of interstellar C I absorption toward λ Ori, 1 Sco, and δ Sco that were obtained with the Goddard High Resolution Spectrograph on the Hubble Space Telescope. Several multiplets were detected within the wavelength interval 1150-1200 Å, where most C I lines have illdefined oscillator strength; multiplets at longer wavelengths with well-defined atomic parameters were also seen. We extracted 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. For many of the lines with wavelengths below 1200 Å, the derived f-values differ appreciably from the values quoted in the compilation by Morton. The present set of f-values extends, and in some cases supersedes, those given by Zsargó, Federman, & Cardelli, which were based on lower resolution data.
Original languageAmerican English
Pages (from-to)1020-1026
Number of pages7
JournalAstrophysical Journal
DOIs
StatePublished - 10 Jul 2001
Externally publishedYes

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atomic physics
Hubble Space Telescope
oscillator strengths
spectrographs
physics
wavelength
carbon
high resolution
fine structure
wavelengths
intervals
parameter

Cite this

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title = "Atomic physics with the goddard high resolution spectrograph on the Hubble Space Telescope. V. Oscillator strengths for neutral carbon lines below 1200 {\AA}",
abstract = "We analyzed high-resolution spectra of interstellar C I absorption toward λ Ori, 1 Sco, and δ Sco that were obtained with the Goddard High Resolution Spectrograph on the Hubble Space Telescope. Several multiplets were detected within the wavelength interval 1150-1200 {\AA}, where most C I lines have illdefined oscillator strength; multiplets at longer wavelengths with well-defined atomic parameters were also seen. We extracted 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. For many of the lines with wavelengths below 1200 {\AA}, the derived f-values differ appreciably from the values quoted in the compilation by Morton. The present set of f-values extends, and in some cases supersedes, those given by Zsarg{\'o}, Federman, & Cardelli, which were based on lower resolution data.",
author = "Federman, {S. R.} and J. Zsarg{\'o}",
year = "2001",
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TY - JOUR

T1 - Atomic physics with the goddard high resolution spectrograph on the Hubble Space Telescope. V. Oscillator strengths for neutral carbon lines below 1200 Å

AU - Federman, S. R.

AU - Zsargó, J.

PY - 2001/7/10

Y1 - 2001/7/10

N2 - We analyzed high-resolution spectra of interstellar C I absorption toward λ Ori, 1 Sco, and δ Sco that were obtained with the Goddard High Resolution Spectrograph on the Hubble Space Telescope. Several multiplets were detected within the wavelength interval 1150-1200 Å, where most C I lines have illdefined oscillator strength; multiplets at longer wavelengths with well-defined atomic parameters were also seen. We extracted 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. For many of the lines with wavelengths below 1200 Å, the derived f-values differ appreciably from the values quoted in the compilation by Morton. The present set of f-values extends, and in some cases supersedes, those given by Zsargó, Federman, & Cardelli, which were based on lower resolution data.

AB - We analyzed high-resolution spectra of interstellar C I absorption toward λ Ori, 1 Sco, and δ Sco that were obtained with the Goddard High Resolution Spectrograph on the Hubble Space Telescope. Several multiplets were detected within the wavelength interval 1150-1200 Å, where most C I lines have illdefined oscillator strength; multiplets at longer wavelengths with well-defined atomic parameters were also seen. We extracted 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. For many of the lines with wavelengths below 1200 Å, the derived f-values differ appreciably from the values quoted in the compilation by Morton. The present set of f-values extends, and in some cases supersedes, those given by Zsargó, Federman, & Cardelli, which were based on lower resolution data.

U2 - 10.1086/321498

DO - 10.1086/321498

M3 - Article

SP - 1020

EP - 1026

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

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