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| | The Cir X-1 HETGS Page |
 | | Circinus X-1 is one of the most luminous of these; its X-ray luminosity is about 100 billion times the X-ray luminosity of our Sun. |
 | | The combination of redshifted emission (from material moving away from us) and blueshifted absorption (from material moving towards us), as shown in the plot, defines a P Cygni line and is the characteristic signature of an outflowing wind. |
 | | In the Chandra spectrum of Circinus X-1, we see many P Cygni lines like the one above from the chemical elements neon, magnesium, silicon, sulfur and iron; above we have only shown one of the many P Cygni lines for clarity of presentation. |
| www.astro.psu.edu /users/niel/cirx1/cirx1.html (635 words) |
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