Variability in X-ray line ratios in helium-like ions of massive stars: the wind-driven case (Corrigendum)

R. Ignace; Z. Damrau; K. T. Hole

doi:10.1051/0004-6361/201834752e

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Erratum

This article is an erratum for:
[https://doi.org/10.1051/0004-6361/201834752]

Issue		A&A Volume 626, June 2019


Article Number		C3
Number of page(s)		1
Section		Stellar atmospheres
DOI		https://doi.org/10.1051/0004-6361/201834752e
Published online		19 June 2019

A&A 626, C3 (2019)

Variability in X-ray line ratios in helium-like ions of massive stars: the wind-driven case (Corrigendum)

R. Ignace¹, Z. Damrau¹ and K. T. Hole²

¹ Department of Physics & Astronomy, East Tennessee State University, Johnson City, TN 37614, USA
e-mail: ignace@etsu.edu
² Norwich University, 158 Harmon Drive, Northfield, VT 05663, USA

Key words: stars: early-type / stars: massive / stars: mass-loss / stars: winds, outflows / X-rays: stars / errata, addenda

Erratum for: A&A, 625, A86 (2019), https://doi.org/10.1051/0004-6361/201834752

Two equations in Ignace et al. (2019) have minor typos. The first correction is in Eq. (15). That expression has three lines. In the first line, there should be no multiplicative factor of R₀ appearing. The correct equation is: $L_{i} = L_{0} \int [\frac{1 + 2 k_{*} W}{A_{0} - k_{*} \sqrt{1 - u^{2}}}] (1 - W) \frac{d u}{w^{2}} \cdot$ $\begin{equation*} L_{\textrm{i}} = L_0\,\int\left[\frac{1+2k_{\ast}\,W}{A_0-k_{\ast}\, \sqrt{1-u^2}}\right]\,(1-W)\,\frac{\textrm{d}u}{w^2}\cdot \end{equation*}$

The other two lines in Eq. (15) are correct.

The second correction is in Eq. (19). As in Eq. (15), the appearance of R₀ is in error. The correct expression is $L_{i} = L_{0^{'}} \int \int [\frac{1 + 2 k_{*} W}{A_{0} - k_{*} \sqrt{1 - u^{2}}}] (1 - W) e^{- τ (u, μ)} \frac{d u}{w^{2}} d μ .$ $\begin{equation*} L_{\textrm{i}} = L_0'\,\int\!\!\!\int\left[\frac{1+2k_{\ast}\,W}{A_0-k_{\ast}\, \sqrt{1-u^2}}\right]\,(1-W)\,\textrm{e}^{-\tau(u,\mu)}\,\frac{\textrm{d}u}{w^2} \,\textrm{d}\mu. \end{equation*}$

The mistakes appearing in Eqs. (15) and (19) are typos that have no bearing on the results appearing in the figures which were computed correctly, nor on the discussion or conclusions of the paper.

References

Ignace, R., Damrau, Z., & Hole, K. T. 2019, A&A, 625, A86 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]

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[1] Ignace, R., Damrau, Z., & Hole, K. T. 2019, A&A, 625, A86 [NASA ADS] [CrossRef] [EDP Sciences] [Google Scholar]