20 citations · 61 across the 7 of their papers we have counts for
7 papers
Variability in X-ray line ratios in helium-like ions of massive stars: the wind-driven case
R. Ignace, Z. Damrau, K. T. Hole
High spectral resolution and long exposure times are providing unprecedented levels of data quality of massive stars at X-ray wavelengths. A key diagnostic of the X-ray emitting pl…
An X-ray Study of Two B+B Binaries: AH Cep and CW Cep
R Ignace, K T Hole, L M Oskinova +1
AH Cep and CW Cep are both early B-type binaries with short orbital periods of 1.8~d and 2.7~d, respectively. All four components are B0.5V types. The binaries are also double-line…
A Coordinated X-ray and Optical Campaign on the Nearest Massive Eclipsing Binary, Delta Ori Aa: I. Overview of the X-ray Spectrum
M. F. Corcoran, J. S. Nichols, H. Pablo +22
We present an overview of four phase-constrained Chandra HETGS X-ray observations of Delta Ori A. Delta Ori A is actually a triple system which includes the nearest massive eclipsi…
A Coordinated X-ray and Optical Campaign of the Nearby Massive Binary Orionis Aa: II. X-ray Variability
J. S. Nichols, D. P. Huenemoerder, M. F. Corcoran +18
We present time-resolved and phase-resolved variability studies of an extensive X-ray high-resolution spectral dataset of the Orionis Aa binary system. The four observations, o…
Variability in X-ray line ratios in helium-like ions of massive stars: the radiation-driven case
K. T. Hole, R. Ignace
Line ratios in "fir" triplets of helium-like ions have proven to be a powerful diagnostic of conditions in X-ray emitting gas surrounding massive stars. Recent observations indicat…
Time-Dependent Behavior of Linear Polarization in Unresolved Photospheres, With Applications for The Hanle Effect
R. Ignace, K. T. Hole, J. P. Cassinelli +1
Aims: This paper extends previous studies in modeling time varying linear polarization due to axisymmetric magnetic fields in rotating stars. We use the Hanle effect to predict var…
Spectropolarimetric Signatures of Clumpy Supernova Ejecta
K. T. Hole, D. Kasen, K. H. Nordsieck
Polarization has been detected at early times for all types of supernova, indicating that such systems result from or quickly develop some form of asymmetry. In addition, the detec…