Plasma Diagnostics and Hydrodynamic Evolution of Solar Flares
... Firstly, I would like to acknowledge the Irish Research Council, the Fulbright Association and NASA’s Living With a Star Targeted Research and Technology Program for funding the research contained in this thesis. I would like to thank my supervisor, Prof. Peter Gallagher for giving me the opportunit ...
... Firstly, I would like to acknowledge the Irish Research Council, the Fulbright Association and NASA’s Living With a Star Targeted Research and Technology Program for funding the research contained in this thesis. I would like to thank my supervisor, Prof. Peter Gallagher for giving me the opportunit ...
Geophysical Turbulence Program
... Going beyond, with the help of symmetries • First evidence of lack of universality in decaying MHD without a uniform magnetic field (20483 equiv. grid): Taylor-Green flow, 3 runs, 3 different energy spectra Ed Lee et al., in preparation ...
... Going beyond, with the help of symmetries • First evidence of lack of universality in decaying MHD without a uniform magnetic field (20483 equiv. grid): Taylor-Green flow, 3 runs, 3 different energy spectra Ed Lee et al., in preparation ...
Runaway collisions in young star clusters – II. Numerical results
... of the cluster, we consider King models with W0 = 3 or 8 (Binney & Tremaine 1987, Section 4.4). We do not enforce tidal truncation because it was shown in GFR04 that this does not affect the central regions which completely dominate the evolution. We refer to GFR04 (section 3 and table 1) for detail ...
... of the cluster, we consider King models with W0 = 3 or 8 (Binney & Tremaine 1987, Section 4.4). We do not enforce tidal truncation because it was shown in GFR04 that this does not affect the central regions which completely dominate the evolution. We refer to GFR04 (section 3 and table 1) for detail ...
Analysis of the 4-year IceCube high
... After a few years of operation, the IceCube Neutrino Observatory has provided compelling evidence for the existence of high-energy astrophysical neutrinos [1–4]. While their extraterrestrial nature is established at more than 6σ confidence level (C.L.) [4], their precise origin is still unknown. The ...
... After a few years of operation, the IceCube Neutrino Observatory has provided compelling evidence for the existence of high-energy astrophysical neutrinos [1–4]. While their extraterrestrial nature is established at more than 6σ confidence level (C.L.) [4], their precise origin is still unknown. The ...
Envelope inflation in massive stars near the Eddington limit
... Massive stars, i.e. those stars with masses more than about 10 times that of the Sun, are important agents for the chemical and dynamical evolution of galaxies. Because of the steep mass-luminosity relation, massive stars are extremely luminous objects. Therefore, increasingly massive stars approach ...
... Massive stars, i.e. those stars with masses more than about 10 times that of the Sun, are important agents for the chemical and dynamical evolution of galaxies. Because of the steep mass-luminosity relation, massive stars are extremely luminous objects. Therefore, increasingly massive stars approach ...
Dark-matter halo mergers as a fertile environment for low
... >106 M the cooling is dominated by H2 and the final stars could have a mass of ∼100 M , while for lower mass haloes HD cooling becomes important and leads to stellar masses between 10 and 40 M . However, the occurrence of such low-mass systems was found to be less frequent. These conclusions are ...
... >106 M the cooling is dominated by H2 and the final stars could have a mass of ∼100 M , while for lower mass haloes HD cooling becomes important and leads to stellar masses between 10 and 40 M . However, the occurrence of such low-mass systems was found to be less frequent. These conclusions are ...
epsilon eridani`s planetary debris disk: structure and dynamics
... on 2006 February 19 using the same observing strategy except that 10 s exposures were used, for an exposure time of 9 × 90 s. The MIPS 160 µm camera suffers from a spectral leak by which stray light in the wavelength range 1–1.6 µm produces a false image partially overlapping the actual 160 µm sourc ...
... on 2006 February 19 using the same observing strategy except that 10 s exposures were used, for an exposure time of 9 × 90 s. The MIPS 160 µm camera suffers from a spectral leak by which stray light in the wavelength range 1–1.6 µm produces a false image partially overlapping the actual 160 µm sourc ...
fundamental properties of kepler planet- candidate
... To detect oscillations and extract the global oscillation parameters Δν and νmax , we have used the analysis pipelines described by Huber et al. (2009), Hekker et al. (2010), Karoff et al. (2010), Verner & Roxburgh (2011) and Lund et al. (2012). Note that these methods have been extensively tested o ...
... To detect oscillations and extract the global oscillation parameters Δν and νmax , we have used the analysis pipelines described by Huber et al. (2009), Hekker et al. (2010), Karoff et al. (2010), Verner & Roxburgh (2011) and Lund et al. (2012). Note that these methods have been extensively tested o ...
The destruction and survival of polycyclic aromatic hydrocarbons in
... PAH destruction process unimolecular dissociation and present a simplified scheme to estimate the location from the star at which the molecules become photo-stable. We find that soft photons with energies below ∼20 eV dissociate PAHs only up to short distances from the star (r < 1 AU); whereas disso ...
... PAH destruction process unimolecular dissociation and present a simplified scheme to estimate the location from the star at which the molecules become photo-stable. We find that soft photons with energies below ∼20 eV dissociate PAHs only up to short distances from the star (r < 1 AU); whereas disso ...
Galaxies on Sub-Galactic Scales
... has also been suggested that the anisotropic satellite distribution is a consequence of the MW being embedded in an extended, prolate dark matter halo where its principal axis is orthogonal to the MW disk (Hartwick 2000; Banerjee & Jog 2011). But there is still much uncertainty and disagreement as t ...
... has also been suggested that the anisotropic satellite distribution is a consequence of the MW being embedded in an extended, prolate dark matter halo where its principal axis is orthogonal to the MW disk (Hartwick 2000; Banerjee & Jog 2011). But there is still much uncertainty and disagreement as t ...
Origin and Evolution of the Abundance Gradient along the Milky
... formation rate (SFR) per unit area is proportional to some power of the gas mass surface density (Kennicutt 1998). This non-linear star formation law may result in and largely influence the building of radial abundance gradients. Another mechanism is the so-called “inside-out” disk formation. In mos ...
... formation rate (SFR) per unit area is proportional to some power of the gas mass surface density (Kennicutt 1998). This non-linear star formation law may result in and largely influence the building of radial abundance gradients. Another mechanism is the so-called “inside-out” disk formation. In mos ...
possibilities for the presence of dust in polars
... used the mass-radius relation for a magnetic, carbon core WD with ¼ 0:1 from Suh & Mathews (2000) to calculate the corresponding WD radius. Radii and temperatures corresponding to a given secondary star mass and spectral type were obtained from Cox (2000) and Pont et al. (2005). In the absence of ...
... used the mass-radius relation for a magnetic, carbon core WD with ¼ 0:1 from Suh & Mathews (2000) to calculate the corresponding WD radius. Radii and temperatures corresponding to a given secondary star mass and spectral type were obtained from Cox (2000) and Pont et al. (2005). In the absence of ...
radioactive 26a1 in the galaxy: observations versus theory
... Enter rudioactivity. Stellar nucleosynthesis produces not only stable, but also unstable nuclei with lifetimes ranging from seconds to billions of years. Their radioactive transitions may give rise to y-ray photons which, under certain conditions, may be detected by sufficiently sensitive instrument ...
... Enter rudioactivity. Stellar nucleosynthesis produces not only stable, but also unstable nuclei with lifetimes ranging from seconds to billions of years. Their radioactive transitions may give rise to y-ray photons which, under certain conditions, may be detected by sufficiently sensitive instrument ...
The spin-up of contracting red supergiants
... place of a strong mean molecular weight gradient. Both, the entropy and the mean molecular weight gradient, act to strongly suppress any kind of mixing through the hydrogen burning shell source. This concerns chemical mixing as well as the transport of angular momentum (e.g., Zahn 1974; Langer et al ...
... place of a strong mean molecular weight gradient. Both, the entropy and the mean molecular weight gradient, act to strongly suppress any kind of mixing through the hydrogen burning shell source. This concerns chemical mixing as well as the transport of angular momentum (e.g., Zahn 1974; Langer et al ...
Anisotropy of the Hectometer Cosmic Radio Background
... correspond to this mode) to the mode of scanning over the four chosen frequencies, quasi-sinusoidal noise variations in the 516, 772, and 1028 kHz channels are clearly seen. The observed modulation with a quasiperiod of 31.4 s is the result of a stroboscopic effect, because the data sampling time in ...
... correspond to this mode) to the mode of scanning over the four chosen frequencies, quasi-sinusoidal noise variations in the 516, 772, and 1028 kHz channels are clearly seen. The observed modulation with a quasiperiod of 31.4 s is the result of a stroboscopic effect, because the data sampling time in ...
The Limits of Our Solar System - Lunar and Planetary Institute
... Sun, they are accelerated inward by gravity but pushed outward by the radiation pressure (see review by Fahr, 1974). For H, the radiation pressure and gravity are comparable, so the H is not accelerated inward. Helium is heavier and is accelerated inward. Hydrogen also has a much shorter ionization ...
... Sun, they are accelerated inward by gravity but pushed outward by the radiation pressure (see review by Fahr, 1974). For H, the radiation pressure and gravity are comparable, so the H is not accelerated inward. Helium is heavier and is accelerated inward. Hydrogen also has a much shorter ionization ...
6th Grade The Theoretical Beginning of the Universe / Big Bang
... Last year, you learned it is possible to estimate the distance a star is from Earth by looking at its brightness. Hubble used a number of methods to estimate how far away each star is. But he did much more. He used the color of each star's light to determine which direction they are moving...and how ...
... Last year, you learned it is possible to estimate the distance a star is from Earth by looking at its brightness. Hubble used a number of methods to estimate how far away each star is. But he did much more. He used the color of each star's light to determine which direction they are moving...and how ...