Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...531..384s&link_type=abstract
The Astrophysical Journal, Volume 531, Issue 1, pp. 384-390.
Astronomy and Astrophysics
Astronomy
17
Atomic Data, Ism: Abundances, Ultraviolet: Ism
Scientific paper
We empirically confirm the theoretical branching ratio and oscillator strength for the weak Mg II 3s-4p doublet at 1240 Å as determined by Theodosiou & Federman. We use the independent methods of apparent optical depth analysis for the sight lines toward μ Col, γ Ara, and ρ Leo and profile component fitting for the sight line toward μ Col in order to determine the branching ratio. We find f1239/f1240=1.74+/-0.06, in agreement with the theoretical value of 1.78+/-0.03. Profile fitting for the line of sight toward μ Col gives an f-value for the doublet of 9.71+/-0.32x10-4, which agrees with both the theoretical value of Theodosiou & Federman and the empirical value of Fitzpatrick. Based on observations obtained with the NASA/ESA Hubble Space Telescope through the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NASA-26555.
Fabian Dirk
Howk Jay Christopher
Sofia Ulysses John
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