Improved Log(gf) Values for Lines of Ti I and Abundance Determinations in the Photospheres of the Sun and Metal-Poor Star HD 84937 (Accurate Transition Probabilities for Ti I)

Access full-text files

2013_04_Lawler.pdf (884.77 KB)

Date

2013-04

Authors

Lawler, James E.
Guzman, A.
Wood, M. P.
Sneden, Christopher
Cowan, John J.

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

New atomic transition probability measurements for 948 lines of Ti I are reported. Branching fractions from Fourier transform spectra and from spectra recorded using a 3 m echelle spectrometer are combined with published radiative lifetimes from laser-induced fluorescence measurements to determine these transition probabilities. Generally good agreement is found in comparisons to the NIST Atomic Spectra Database. The new Ti I data are applied to re-determine the Ti abundance in the photospheres of the Sun and metal-poor star HD 84937 using many lines covering a range of wavelength and excitation potential to explore possible non-local thermal equilibrium effects. The variation of relative Ti/Fe abundance with metallicity in metal-poor stars observed in earlier studies is supported in this study.

Department

Astronomy

Description

Keywords

atomic data, methods: laboratory, stars: abundances, relative oscillator-strengths, galactic chemical evolution, solar, titanium abundance, argon branching ratios, sensitivity, absorption-spectroscopy, spectral-intensity calibration, core-collapse, supernovae, r-process-rich, a1d2 0.90 ev, radiative lifetimes, astronomy & astrophysics

LCSH Subject Headings

Citation

Lawler, J. E., A. Guzman, M. P. Wood, C. Sneden, and J. J. Cowan. "Improved log (gf) Values for Lines of Ti I and Abundance Determinations in the Photospheres of the Sun and Metal-Poor Star HD 84937 (Accurate Transition Probabilities for Ti I)." The Astrophysical Journal Supplement Series, Vol. 205, No. 2 (Apr., 2013): 11.

URI

http://hdl.handle.net/2152/42910

Collections

UT Faculty/Researcher Works