Absolute oscillator strengths for lines of neutral cobalt between 2276 A and 9357 A and a redetermination of the solar cobalt abundance

Journal Article · Wed Sep 01 00:00:00 EDT 1982 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160264· OSTI ID:7063920

Cardon, B L; Smith, P L; Scalo, J M; Testerman, L; Whaling, W

Absolute oscillator strengths of neutral cobalt have been determined from hook measurements for 159 transitions and emission intensity measurements for 314 transitions between 2276 A and 9357 A. Ninety-five of these transitions were subjected to the procedure developed by Cardon, Smith, and Whaling which fits combined absorption and emission data to a set of consistent, optimum, relative oscillator strengths and upper level lifetimes. These relative values were normalized to the radiative lifetimes of Figger et al. and of Marek and Vogt obtained by pulsed laser fluorescence. Absolute oscillator strengths for 362 transitions and 36 lifetimes were determined. Typical uncertainties in the reported absolute oscillator strengths are +- 15-25% (2/3 confidence level). Equivalent widths were obtained for nineteen solar cobalt lines with the McMath solar telescope at Kitt Peak National Observatory. These widths were used to redetermine the solar cobalt abundance, assuming the photospheric model of Holweger and a microturbulence velocity of 1.0 km s/sup -1/. The adopted solar cobalt abundance is the mean value log +12 = 4.92 +- 0.08 ( +- 19%), from the 19 cobalt transitions. This value is in excellent agreement with the solar values of Ross and Aller, of Biemont, and of Holweger and that of Cameron for carbonaceous chondrites.

• Research Organization: Harvard-Smithsonian Center of Astrophysics
• OSTI ID: 7063920
• Journal Information: Astrophys. J.; (United States), Vol. 260:1
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COBALT
ENERGY-LEVEL TRANSITIONS
OSCILLATOR STRENGTHS
ABSORPTION SPECTRA
CHEMICAL COMPOSITION
EMISSION SPECTRA
ENERGY LEVELS
LINE WIDTHS
SUN
ELEMENTS
MAIN SEQUENCE STARS
METALS
SPECTRA
STARS
TRANSITION ELEMENTS
640104* - Astrophysics & Cosmology- Solar Phenomena