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| Paper: |
X-Ray Spectroscopy of the O2 If* Star HD 93129A |
| Volume: |
465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat |
| Page: |
147 |
| Authors: |
Cohen, D. H. |
| Abstract: |
The O2 If* star, HD 93129A, is among the earliest in the Galaxy and
has one of the strongest winds of any O star. In this paper, we
show that its hard and strong X-ray emission can be understood in
terms of the standard embedded wind shock paradigm for effectively
single, hot, massive stars. Wind attenuation of the intrinsically
soft X-ray emission is an important effect, which explains the
hardness of the observed X-rays. We measure the degree of wind
absorption in two different ways in order to derive a mass-loss rate
of roughly 6×10–6 M☉ yr-1. This value is consistent
with the observed Hα line if a clumping factor of fcl =
12 is assumed. |
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