200 citations · 358 across the 8 of their papers we have counts for
6 papers · 1 filter
Short-N characteristic radiative transfer method in 2D cylindrical RZ coordinates
Nicolas A. Pereyra, Joseph J. MacFarlane, Pamela R. Woodruff +2
We present a new radiative transfer method Short-N Characteristics that is a hybrid between the standard long characteristic methods and the standard short characteristic methods.…
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…
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…
EUV/X-ray Emission and the Thermal and Ionization Structure of B Star Winds
David H. Cohen, Joseph P. Cassinelli, Joseph J. MacFarlane +1
We discuss the EUV and X-ray properties of B stars, focusing on CMa (B2 II) which is the only star with both emission lines and a photospheric continuum detected with EUVE. We…