200 citations
- Swarthmore CollegeUS6 papers
- University of DelawareUS5 papers
- Lawrence Livermore National LaboratoryUS3 papers
- Sandia National LaboratoriesUS3 papers
- University of Nevada, RenoUS3 papers
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- Columbia UniversityUS2 papers
- Los Alamos National LaboratoryUS2 papers
- University of Wisconsin–Eau ClaireUS2 papers
- Applied Energetics (United States)US1 paper
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR1 paper
- Energetics (United States)US1 paper
7 papers · 1 filter
Wind signatures in the X-ray emission line profiles of the late O supergiant Orionis
David H. Cohen, Maurice A. Leutenegger, Kevin T. Grizzard +3
X-ray line profile analysis has proved to be the most direct diagnostic of the kinematics and spatial distribution of the very hot plasma around O stars. In this paper we apply sev…
Chandra HETGS Multi-Phase Spectroscopy of the Young Magnetic O Star theta^1 Orionis C
Marc Gagne, Mary E. Oksala, David H. Cohen +5
We report on four Chandra grating observations of the oblique magnetic rotator theta^1 Ori C (O5.5 V) covering a wide range of viewing angles with respect to the star's 1060 G dipo…
High Resolution X-ray Spectra of the Brightest OB Stars in the Cygnus OB2 Association
W. L. Waldron, J. P. Cassinelli, N. A. Miller +2
The Cygnus OB2 Association contains some of the most luminous OB stars in our Galaxy, the brightest of which are also among the most luminous in X-rays. We have obtained a Chandra…
X ray emission line profile modeling of hot stars
Roban H. Kramer, Stephanie K. Tonnesen, David H. Cohen +3
The launch of high-spectral-resolution x-ray telescopes (Chandra, XMM) has provided a host of new spectral line diagnostics for the astrophysics community. In this paper we discuss…
X-ray Emission Line Profile Modeling of O stars: Fitting a Spherically-Symmetric Analytic Wind-Shock Model to the Chandra Spectrum of zeta Puppis
Roban H. Kramer, David H. Cohen, Stanley P. Owocki
X-ray emission line profiles provide the most direct insight into the dynamics and spatial distribution of the hot, X-ray-emitting plasma above the surfaces of OB stars. The O supe…
High-Resolution {\it Chandra} Spectroscopy of tau Scorpii: A Narrow-Line X-ray Spectrum From a Hot Star
David H. Cohen, Geneviève E. de Messières, Joseph J. MacFarlane +4
Long known to be an unusual early-type star by virtue of its hard and strong X-ray emission, tau Scorpii poses a severe challenge to the standard picture of O-star wind-shock X-ray…