In Slater's 1960 standard work on confluent hypergeometric functions, also called Kummer functions, a number of asymptotic expansions of these functions can be found. We summarize expansions derived from a differential equation for large values of the $a-$parameter. We show how similar expansions can be derived by using integral representations, and we observe discrepancies with Slater's expansions.

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Advances in Dynamical Systems and Applications , Proceedings of the International Conference on Differential Equations, Difference Equations and Special Functions, Patras, September 3–9, 2012
International Conference on Differential Equations, Difference Equations and Special Functions

Temme, N. (2013). Remarks on Slater's asymptotic expansions of Kummer functions for large values of the $a-$parameter. Proceedings of the International Conference on Differential Equations, Difference Equations and Special Functions, Patras, September 3–9, 2012, 8(2), 365–377.