Astrophysical Determination of Optical Oscillator Strengths for Ti II

Details Astrophysical Determination of Optical Oscillator Strengths for Ti II Astrophysical Determination of Optical Oscillator Strengths for Ti II

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267..697r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 267, NO. 3/APR1, P. 697, 1994

Astronomy and Astrophysics

Astronomy

19

Atomic Data - Line: Formation - Stars: Abundances

Scientific paper

An internally consistent set of relative oscillator strengths for 109 spectral lines of Ti II in the range 3800-5500 Å has been derived. These oscillator strengths have been obtained by combining available laboratory data and theoretical calculations with new astrophysical oscillator strengths determined from both published photographic equivalent width lists and spectral synthesis of a number of available Reticon spectra of several sharp-lined stars. The accuracy of our astrophysical oscillator strengths has been tested by determining astrophysical gf-values for a number of lines of Fe II by the same methods. The Ti II data have been normalized to the astrophysical oscillator strengths of Kostyk & Orlova, which also places them essentially on the scale of Danzmann & Kock, one of the most recent and extensive experimental data sets. It appears that the accuracy of the relative gf-values in our final mean list for Ti II is typically about 0.08 dex. The absolute normalization is believed to be secure to within about 0.15 dex.

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