In hot pursuit of the hidden companion of η Carinae: an X-ray determination of the wind parameters

  title={In hot pursuit of the hidden companion of $\eta$ Carinae: an X-ray determination of the wind parameters},
  author={Julian M. Pittard and M F Leeds and UK. and Gsfc and Usa},
We present X-ray spectral ts to a recently obtained Chandra grating spectrum of Carinae, one of the most massive and powerful stars in the Galaxy and which is strongly suspected to be a colliding wind binary system. Hydrodynamic models of colliding winds are used to generate synthetic X-ray spectra for a range of mass-loss rates and wind velocities. They are then tted against newly acquired Chandra grating data. We nd that due to the low velocity of the primary wind (500 km s 1 ), most of the… 
Accretion onto the Companion of η Carinae during the Spectroscopic Event. II. X-Ray Emission Cycle
We calculate the X-ray luminosity and light curve for the stellar binary system η Car for the entire orbital period of 5.54 yr. By using a new approach we find, as suggested in previous works, that
The environment of the wind–wind collision region of η Carinae
Context. η Carinae is a colliding wind binary hosting two of the most massive stars and featuring the strongest wind collision mechanical luminosity. The wind collision region of this system is
The Colliding Winds of WR 25 in High-resolution X-Rays
WR 25 is a colliding-wind binary star system comprising a very massive O2.5If*/WN6 primary and an O-star secondary in an eccentric orbit with a 208 day period. These hot stars have strong, highly
Chandra X-Ray Grating Spectrometry of η Carinae near X-Ray Minimum. I. Variability of the Sulfur and Silicon Emission Lines
We report on variations in important X-ray emission lines in a series of Chandra grating spectra of the supermassive colliding wind binary star η Car, including key phases around the X-ray
The column density to the hardest emission component, N H ~1024 H cm-2, marked one of the highest values ever observed for η Car, strongly suggesting the increased obscuration of the wind-wind colliding X-ray emission by the thick primary stellar wind prior to superior conjunction.
X-Ray Spectral Variation of η Carinae through the 2003 X-Ray Minimum
We report the results of an observing campaign on η Car around the 2003 X-ray minimum, mainly using the XMM-Newton observatory. These are the first spatially resolved X-ray monitoring observations of
The binary nature of the Galactic centre X-ray source CXOGC J174536.1-285638
Context. The combination of X-ray and near-IR surveys of the central 2 o × 0.8 o of the Galactic centre have revealed a population of X-ray bright massive stars. However, the nature of the X-ray
Uncovering the orbital dynamics of stars hidden inside their powerful winds: application to η Carinae and RMC 140
Determining accurate orbits of binary stars with powerful winds is challenging. The dense outflows increase the effective photospheric radius, precluding direct observation of the Keplerian motion;
LIFELINE: The program for the simulation of the X-ray line profiles in massive colliding wind binaries
Aims. The study of the X-ray line profiles produced by massive colliding wind binaries is a powerful tool for the characterisation of the stellar winds. We built a self-consistent program for the
Unveiling the X-ray point source population of the Young Massive
Aims. We investigate the nature of the X-ray point source population within the Young Massive Cluster Westerlund 1. Methods. Chandra observations of 18 ks and 42 ks were used to determine the X-ray