Workshop on Astrophysical Opacities

Los Alamos opacity data for astrophysical applications

3 Aug 2017, 14:40

20m

Western Michigan University Kalamazoo, MI, USA

Contributed talks Atomic Opacities

Speaker

Dr James Colgan (LANL)

Description

A new set of Los Alamos OPLIB opacity tables for the elements hydrogen through zinc have recently been released [1] and are available online [2]. Our tables have been computed using the Los Alamos ATOMIC code [3,4], which make use of atomic structure calculations from the Los Alamos suite of atomic physics codes [5] that include fine-structure detail for all the elements considered. The equation-of-state model used in our opacity table calculations, known as ChemEOS [6,7], is based on the minimization of free energy in a chemical picture. Recent publications by us [1,8] have compared our calculations to available experimental opacity data and to other opacity calculations. Our tables have also been used in some recent stellar modeling calculations [9,10]. This poster presentation will give an overview of our opacity calculations and provide some examples of comparisons to other work and of selected stellar modeling applications. The Los Alamos National Laboratory is operated by Los Alamos National Security, LLC for the National Nuclear Security Administration of the U.S. Department of Energy under Contract No. DE-AC5206NA25396. [1] J. Colgan et al., Ap. J. **817**, 116 (2016). [2] http://aphysics2.lanl.gov/opacity/lanl [3] N. H. Magee et al., Atomic Processes in Plasmas, 14th APS Topical Conference Proceedings, (Eds.: J. S. Cohen, S. Mazevet, and D. P. Kilcrease), Santa Fe, NM pp 168-180 (2004). [4] P. Hakel et al., 11th International Workshop on Radiative Properties of Hot Dense Matter, J. Quant. Spectr. Rad. Transfer **99**, 265 (2006). [5] C. J. Fontes et al., J. Phys. B **48**, 144014 (2015). [6] P. Hakel, and D. P. Kilcrease, 14th Topical Conference on Atomic Processes in Plasmas, Eds: J. S. Cohen, S. Mazevet, and D. P. Kilcrease, (New York: AIP), pp. 190-199 (2004). [7] D. P. Kilcrease, J. Colgan, P. Hakel, C. J. Fontes, and M. E. Sherrill, High Energy Density Phys. **16**, 36-40 (2015). [8] J. Colgan et al., Proceedings of the International Conference on Atomic and Molecular Data, pp. 17-26 (2013); J. Colgan et al., High Energy Density Physics **9**, 369 (2013); J. Colgan et al., High Energy Density Physics **14**, 33 (2015). [9] J. A. Guzik, C. J. Fontes, P. Walczak, S. R. Wood, K. Mussack, and E. Farag, XXIXth IAU General Assembly Proceedings, August 2015 (Cambridge University Press, 2015). [10] P. Walczak et al., Astron. Astrophys. **580**, L9 (2015).