= Douglas R. Gies
{c}
= D. R. Gies
{c}
{synonym}
<D. R. Gies> co-authored a <spectroscopy> study connecting <stellar wind> signatures with the <X-ray> behavior of <Cygnus X-1>. The team monitored <H-alpha> emission and separated components associated with different moving gas structures.
Comparing those line profiles with <X-ray> output supplied evidence about the supply of gas to an accreting <black hole>. The paper interpreted changes in the donor wind as a possible driver of changes in <accretion rate> and radiation state.<Wind Accretion and State Transitions in Cygnus X-1 by D. R. Gies and others>[Abstract: spectroscopic monitoring, H-alpha components and the proposed link between wind changes and X-ray states]{ref}
\Image[https://www.astro.gsu.edu/~gies/dgies.jpg]
{title=Portrait of <Douglas R. Gies>}
{description=External portrait linked from the institutional profile.}
{source=https://www.astro.gsu.edu/~gies/gies.html}
{width=240}
Back to article page
