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6 papers · 1 filter
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…
Protoplanetary Disk Mass Distribution in Young Binaries
Eric L. N. Jensen, Rachel L. Akeson
We present millimeter-wave continuum images of four wide (separations 210-800 AU) young stellar binary systems in the Taurus-Auriga star-forming region. For all four sources, the r…
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…
Minimal Superspace Vector Fields for 5D Minimal Supersymmetry
S. James Gates, Lubna Rana
We investigate a minimal superspace description for 5D superconformal Killing vectors. The vielbein appropriate for AdS symmetry is discussed within the confines of this minimal su…
Closed Timelike Curves in Flat Lorentz Spacetimes
Virginie Charette, Todd A. Drumm, Dieter Brill
We consider the region of closed timelike curves (CTC's) in three-dimensional flat Lorentz spacetimes. The interest in this global geometrical feature goes beyond the purely mathem…