English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

High spectral resolution and long exposure times are providing unprecedentedlevels of data quality of massive stars at X-ray wavelengths. A key diagnosticof the X-ray emitting plasma are the fir lines for He-like triplets. Inparticular, owing to radiative pumping effects, theforbidden-to-intercombination line luminosity ratio, R=f/i, can be used todetermine the proximity of the hot plasma to the UV-bright photospheres ofmassive stars. Moreover, the era of large observing programs additionallyallows for investigation of line variability. This contribution is the secondto explore how variability in the line ratio can provide new diagnosticinformation about distributed X-rays in a massive star wind. While there aremany ways to drive variability in the line ratio, we use variable mass loss asan illustrative example. The f/i ratio can be significantly modulated owing toevolving wind properties. We evaluate how variable mass loss might biasmeasures of f/i.

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