271 citations · 2.7k across the 80 of their papers we have counts for
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Suzaku and XMM-Newton Observations of Diffuse X-ray Emission from the Eastern Tip Region of the Carina Nebula
Yuichiro Ezoe, Kenji Hamaguchi, Robert A. Gruendl +3
The eastern tip region of the Carina Nebula was observed with the Suzaku XIS for 77 ks to conduct a high-precision spectral study of extended X-ray emission. XMM-Newton EPIC data o…
Resolving a Class I Protostar Binary System with Chandra
Kenji Hamaguchi, Minho Choi, Michael F. Corcoran +3
Using a sub-pixel event repositioning technique, we spatially resolved X-ray emission from the infrared double system IRS 5 in the R Corona Australis molecular cloud with ~0.8" sep…
Modeling the RXTE light curve of Carinae from a 3-D SPH simulation of its binary wind collision
A. T. Okazaki, S. P. Owocki, C. M. Russell +1
The very massive star system Carinae exhibits regular 5.54-year (2024-day) period disruptive events in wavebands ranging from the radio to X-ray. There is a growing consensus t…
3-D SPH simulations of colliding winds in eta Carinae
Atsuo T. Okazaki, Stanley P. Owocki, Christopher M. P. Russell +1
We study colliding winds in the superluminous binary eta Carinae by performing three-dimensional, Smoothed Particle Hydrodynamics (SPH) simulations. For simplicity, we assume both…
Chandra X-ray Grating Spectrometry of Eta Carinae near X-ray Minimum: I. Variability of the Sulfur and Silicon Emission Lines
D. B. Henley, M. F. Corcoran, J. M. Pittard +3
We report on variations in important X-ray emission lines in a series of Chandra grating spectra of the supermassive colliding wind binary star Eta Carinae, including key phases ar…
A multispectral view of the periodic events in eta Carinae
A. Damineli, D. J. Hillier, M. F. Corcoran +13
A full description of the 5.5-yr low excitation events in Eta Carinae is presented. We show that they are not as simple and brief as previously thought, but a combination of two co…
Eta Car and Its Surroundings: the X-ray Diagnosis
M. F. Corcoran, K. Hamaguchi
X-ray emission from the supermassive star Eta Carinae (\ec) originates from hot shocked gas produced by current stellar mass loss as well as ejecta from prior eruptive events. Abso…
Eta Car and other LBVs
M. F. Corcoran
Luminous Blue Variables (LBVs) are believed to be evolved, extremely massive stars close to the Eddington Limit and hence prone to bouts of large-scale, unstable mass loss. I discu…
First detection of phase-dependent colliding wind X-ray emission outside the Milky Way
Yael Naze, Michael F. Corcoran, Gloria Koenisgberger +1
After having reported the detection of X-rays emitted by the peculiar system HD5980, we assess here the origin of this high-energy emission from additional X-ray observations obtai…
The UV Scattering Halo of the Central Source Associated with Eta Carinae
D. John Hillier, T. Gull, K. Nielsen +8
We have made an extensive study of the UV spectrum of Eta Carinae, and find that we do not directly observe the star and its wind in the UV. Because of dust along our line of sight…
Discovery of CH and OH in the -513 km s-1 Ejecta of Eta Carinae
E. Verner, F. Bruhweiler, K. E. Nielsen +3
The very massive star, Eta Carinae, is enshrouded in an unusual complex of stellar ejecta, which is highly depleted in C and O, and enriched in He and N. This circumstellar gas giv…
Discovery of Extremely Embedded X-ray Sources in the R Coronae Australis Star Forming Core
Kenji Hamaguchi, Michael F. Corcoran, Rob Petre +5
With the XMM-Newton and Chandra observatories, we detected two extremely embedded X-ray sources in the R Corona Australis (R CrA) star forming core, near IRS 7. These sources, desi…
XMM-Newton Observations of the 2003 X-ray Minimum of Eta Carinae
K. Hamaguchi, M. F. Corcoran, T. Gull +3
The XMM-Newton X-ray observatory took part in the multi-wavelength observing campaign of the massive, evolved star Eta Carinae in 2003 during its recent X-ray minimum. This paper r…
X-ray Gyrations of Eta Carinae, or, Is Presence of Evidence Evidence of Presence?
M. F. Corcoran, K. Hamaguchi, T. Gull +2
We review the properties of the variable X-ray emission from the extremely massive star Eta Carinae concentrating on the last X-ray minimum, and briefly consider the possible role…
A Change in the Physical State of Carinae?
K. Davidson, J. C. Martin, R. M. Humphreys +8
During Car's spectroscopic event in mid-2003, the stellar wind's bright H and H emission lines temporarily had a distinctive shape unlike that reported on any previous oc…
X-ray and radio emission from colliding stellar winds
J. M. Pittard, S. M. Dougherty, R. F. Coker +1
The collision of the hypersonic winds in early-type binaries produces shock heated gas, which radiates thermal X-ray emission, and relativistic electrons, which emit nonthermal rad…
A Period and a Prediction for the Of?p Spectrum Alternator HD 191612
Nolan R. Walborn, Ian D. Howarth, Gregor Rauw +7
The observational picture of the enigmatic O-type spectrum variable HD191612 has been sharpened substantially. A symmetrical, low-amplitude light curve with a period near 540 d has…
Probing Colliding Wind Binaries with High-Resolution X-ray Spectra
D. B. Henley, I. R. Stevens, J. M. Pittard +2
X-ray line profiles represent a new way of studying the winds of massive stars. In particular, they enable us to probe in detail the wind-wind collision in colliding wind binaries,…
Multi-Wavelength Observations of Colliding Stellar Winds
M. F. Corcoran, J. M. Pittard, I. R. Stevens +2
Massive colliding wind binary stars serve as laboratories for the study of strong-shock physics. In these systems fundamental flow parameters (velocities, densities, directions) ar…
Chandra Observation of the Trifid Nebula: X-ray emission from the O star complex and actively forming pre-main sequence stars
J. Rho, S. Ramirez, M. F. Corcoran +2
The Trifid Nebula, a young star-forming HII region, was observed for 16 hours by the Chandra X-ray Observatory. We detected 304 X-ray sources, thirty percent of which are hard sour…
A spectral and spatial analysis of eta Carinae's diffuse X-ray emission using CHANDRA
Kerstin Weis, Michael F. Corcoran, Dominik J. Bomans +1
The luminous unstable star (star system) eta Carinae is surrounded by an optically bright bipolar nebula, the Homunculus and a fainter but much larger nebula, the so-called outer e…
Chandra Observations of a Young Embedded Magnetic B Star in the rho Ophiuchus Cloud
Kenji Hamaguchi, Michael F. Corcoran, Kensuke Imanishi
This paper reports on an analysis of two Chandra X-ray observations of the young magnetic B star rho Ophiuchus S1. X-ray emission from the star was detected in both observations. T…
Cosmic Ray Acceleration by Stellar Associations? The Case of Cygnus OB2
Yousaf Butt, Paula Benaglia, Jorge Combi +10
The origins of all extra-solar cosmic rays -- both the ultra high-energy and lower energy Galactic variety -- remain unclear. It has been argued that the large scale shocks and tur…
Chandra Grating Spectroscopy of the X-ray Binary 4U 1700-37 in a Flaring State
B. Boroson, S. Vrtilek, T. Kallman +1
Chandra X-ray Observatory grating spectra of the supergiant X-ray Binary 4U 1700-37 reveal emission lines from hydrogen and helium-like S, Si, Mg, and Ne in the 4-13 A range. The s…