Zobrazeno 1 - 10
of 91
pro vyhledávání: '"Liedahl, Duane A."'
Autor:
Phipps, Claude R., Baker, Kevin L., Bradford, Brian, George, E. Victor, Libby, Stephen B., Liedahl, Duane A., Marcovici, Bogdan, Olivier, Scot S., Pleasance, Lyn D., Reilly, James P., Rubenchik, Alexander, Strafford, David N., Valley, Michael T.
Orbital debris in low Earth orbit (LEO) are now sufficiently dense that the use of LEO space is threatened by runaway collisional cascading. A problem predicted more than thirty years ago, the threat from debris larger than about 1 cm demands serious
Externí odkaz:
http://arxiv.org/abs/1110.3835
Proposals for ground-based laser remediation of space debris rely on the creation of appropriately directed ablation-driven impulses to either divert the fragment or drive it into an orbit with a perigee allowing atmospheric capture. For a spherical
Externí odkaz:
http://arxiv.org/abs/1004.0390
Publikováno v:
AIP Conf.Proc.1054:3-11,2008
We provide a brief review of the physical processes behind the radiative driving of the winds of OB stars and the Bondi-Hoyle-Lyttleton capture and accretion of a fraction of the stellar wind by a compact object, typically a neutron star, in detached
Externí odkaz:
http://arxiv.org/abs/0806.1073
Publikováno v:
2008 ApJ 673, 1023
We present here X-ray spectra of the HMXB SMC X-1 obtained in an observation with the XMM observatory beginning before eclipse and ending near the end of eclipse. With the Reflection Grating Spectrometers (RGS) on board XMM, we observe emission lines
Externí odkaz:
http://arxiv.org/abs/0710.3866
Publikováno v:
Prog.Theor.Phys.Suppl.169:196-199,2007
We describe preliminary results of a global model of the radiatively-driven photoionized wind and accretion flow of the high-mass X-ray binary Vela X-1. The full model combines FLASH hydrodynamic calculations, XSTAR photoionization calculations, HULL
Externí odkaz:
http://arxiv.org/abs/0704.0237
Autor:
Liedahl, Duane A., Torres, Diego F.
Publikováno v:
Can.J.Phys.83:1149-1272,2005
Current astrophysical research suggests that the most persistently luminous objects in the Universe are powered by the flow of matter through accretion disks onto black holes. Accretion disk systems are observed to emit copious radiation across the e
Externí odkaz:
http://arxiv.org/abs/astro-ph/0510093
Autor:
Liedahl, Duane A.
We examine the effects of resonant Auger destruction in modifying the intensities and flux distributions of K-alpha spectra from iron L-shell ions. Applications include X-ray irradiated stellar winds in X-ray binaries and accretion disk atmospheres.
Externí odkaz:
http://arxiv.org/abs/astro-ph/0502002
We provide a discussion of the density and photoexcitation sensitivity of the X-ray spectra of Fe L-shell ions (Fe XVII-Fe XXIV) calculated with the Livermore X-ray Spectral Synthesizer, a suite of IDL codes that calculates spectral models of highly
Externí odkaz:
http://arxiv.org/abs/astro-ph/0412339
Publikováno v:
Astrophys.J. 625 (2005) 931-950
We identify an accretion disk atmosphere and corona from the high resolution X-ray spectrum of Hercules X-1, and we determine its detailed physical properties. More than two dozen recombination emission lines (from Fe XXVI at 1.78 A to N VI at 29.08
Externí odkaz:
http://arxiv.org/abs/astro-ph/0411780
We calculate the atmospheric structure of an accretion disk around a Kerr black hole and obtain its X-ray spectrum, which exhibits prominent atomic transitions under certain circumstances. The gravitational and Doppler (red)shifts of the C V, C VI, O
Externí odkaz:
http://arxiv.org/abs/astro-ph/0404064