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This article is an erratum for:

Volume 623, March 2019
Article Number C3
Number of page(s) 1
Section Letters to the Editor
Published online 22 March 2019

In our article (Rodger & Labrosse 2018) a small factor of is missing from Eq. (1). The correct expression for the absorption coefficient from thermal bremsstrahlung should read:(1)

The omission of the term in the published study does not change our analysis or the conclusions which we draw.The spectral gradient does not depend on it and thus the results from the models given in our analysis show simply a case with slightly lower optical thickness than would be expected.


  1. Rodger, A. S., & Labrosse, N. 2018, A&A, 617, L6 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]

© ESO 2019

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