Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...547.1178w&link_type=abstract
The Astrophysical Journal, Volume 547, Issue 2, pp. 1178-1183.
Astronomy and Astrophysics
Astronomy
14
Atomic Data, Ism: Abundances
Scientific paper
We report laboratory measurements of the oscillator strengths for the Ti II vacuum ultraviolet resonance transitions 3d24s a4F3/2-3d4s4p(3Po) 4Fo3/2 at λvac=191.0938 nm and 3d24s a4F3/2- 3d4s4p(3Po) 4Do1/2 at 191.0609 nm. Using the High Sensitivity Absorption Spectroscopy Experiment at the Synchrotron Radiation Center in Stoughton, Wisconsin, we determined the f-values for the Ti II 191.06 and 191.09 nm transitions relative to the well-known f-values of the Ti II resonance transitions 3d24s a4F3/2-3d24p z4Do3/2 at λvac=306.7245 nm and 3d24s a4F3/2-3d24p z4Go5/2 at 338.4740 nm. The Ti II 191.06 nm absorption f-value is 0.104+/-0.004. The Ti II 191.09 nm absorption f-value is 0.098+/-0.003. The Ti II 191.06 and Ti II 191.09 nm transitions have been detected in ground-based observations of high-redshift quasi-stellar object (QSO) absorption-line systems and in space-based observations. Use of these refined f-values causes a minimal change in the Ti abundances reported for some QSO absorption-line systems and for the Large Magellanic Cloud toward SN 1987A. The overabundance of Ti relative to Fe in comparison to solar abundances for two QSO absorption-line systems is decreased by our results. In general Ti abundances based on the 191 nm lines now can be put on an accurate absolute scale.
Fedchak J. A.
Lawler James E.
Wiese L. M.
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