Physics
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dmp..op17t&link_type=abstract
American Physical Society, DAMOP Meeting, 27-30 May 1998 Santa Fe, New Mexico, abstract #OP.17
Physics
Scientific paper
Using a careful and accurate semiempirical calculation of transition matrix elements we have obtained the oscillator strengths to 4p configurations in Mg II. The measurement of these lines is very important to the observational determination of the Mg abundance in the interstellar medium, because the principal transitions 3s - 3p in the UV are strongly saturated. At the same the 3s - 4p transitions are very weak because the transition matrix elements have an accidental cancellation. The present values, f(3s-4p_3/2) = 6.394(-4) and f(3s-4p_1/2) = 3.595(-4), are an improvement, actually a refinement, of previous results by the same author [Theodosiou, Curtis, and Nicolaides, Phys. Rev. A 52, 3677 (1995)] and provide strong theoretical support of the recent empirical determinations , f(3s-4p_3/2) = 6.4(4)(-4) and f(3s-4p_1/2) = 3.2(2)(-4), by Fitzpatrick [Ap. J. 482, L199 (1997)] using observations by the Hubble Space Telescope. We hope that the present results settle definitively the question of the Mg abundance in the interstellar medium.
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