205 Advances in Natural and Applied Sciences, 4(2): 205-209, 2010 ISSN 1995-0772
... neutron star or a black hole formed after collapse of an ordinary star) and a stellar companion, orbit each other at a distance small enough to enable mass transfer from the companion star to the compact object. The transferred matter spirals towards the compact object and forms an “accretion disk” ...
... neutron star or a black hole formed after collapse of an ordinary star) and a stellar companion, orbit each other at a distance small enough to enable mass transfer from the companion star to the compact object. The transferred matter spirals towards the compact object and forms an “accretion disk” ...
MHD seismology as a tool to diagnose the coronae of X
... (Chabrier & Baraffe 1997). These cool dwarfs may not undergo the same dynamo process (Browning 2008), therefore, they can be low X-ray luminous and active (Robrade & Schmitt 2005) stars during the typical transient activities. These stars can also produce strong impulsive flares of short duration as ...
... (Chabrier & Baraffe 1997). These cool dwarfs may not undergo the same dynamo process (Browning 2008), therefore, they can be low X-ray luminous and active (Robrade & Schmitt 2005) stars during the typical transient activities. These stars can also produce strong impulsive flares of short duration as ...
White dwarf cooling sequences and cosmochronology
... interfaces, proton burning, stellar winds and mass accretion from the interstellar medium — see, for instance Fontaine (2013), this volume. The structure of white dwarfs is sustained by the pressure of degenerate electrons and these stars cannot obtain energy from thermonuclear reactions. Therefore, ...
... interfaces, proton burning, stellar winds and mass accretion from the interstellar medium — see, for instance Fontaine (2013), this volume. The structure of white dwarfs is sustained by the pressure of degenerate electrons and these stars cannot obtain energy from thermonuclear reactions. Therefore, ...
CEA - The Sun
... of this which, nevertheless, amounts to 178 million billion watts! Thermonuclear fusion, the process generating this energy, compensates for the loss of energy at the surface and allows the Sun to burn sustainably; contraction causes an increase in heating providing the energy to remain in balance f ...
... of this which, nevertheless, amounts to 178 million billion watts! Thermonuclear fusion, the process generating this energy, compensates for the loss of energy at the surface and allows the Sun to burn sustainably; contraction causes an increase in heating providing the energy to remain in balance f ...
Young Stellar Objects in the Orion B Cloud
... interesting is the frequency mass distribution of the YSOs, i.e., the shape of the mass function, and, related to this, the number of substellar sources. Even though a number of surveys of different star formation regions have been carried out over the last decade, there is still an ongoing debate o ...
... interesting is the frequency mass distribution of the YSOs, i.e., the shape of the mass function, and, related to this, the number of substellar sources. Even though a number of surveys of different star formation regions have been carried out over the last decade, there is still an ongoing debate o ...
- EPJ Web of Conferences
... interstellar medium and evidence for the presence of very large negatively charged molecules in the atmosphere of Titan shed new lights on the chemistry of astrophysical environments. The variety, complexity and sometimes exoticism of the molecules presently discovered in extraterrestrial environmen ...
... interstellar medium and evidence for the presence of very large negatively charged molecules in the atmosphere of Titan shed new lights on the chemistry of astrophysical environments. The variety, complexity and sometimes exoticism of the molecules presently discovered in extraterrestrial environmen ...
The Case for a Kilometer-Scale High Energy Neutrino Detector
... generated in roughly equal numbers in the decays of pions produced in nuclear cascades in the beam dump. For every π 0 producing two gamma rays, there is a charged π + and π − decaying into µ+ νµ . As a rule of thumb the dump produces one neutrino for each interacting proton. If the kinematics is su ...
... generated in roughly equal numbers in the decays of pions produced in nuclear cascades in the beam dump. For every π 0 producing two gamma rays, there is a charged π + and π − decaying into µ+ νµ . As a rule of thumb the dump produces one neutrino for each interacting proton. If the kinematics is su ...
Astrophysical S-factor of P PНеP PС radiative capture at low energies
... The sum of all three E2 transitions, which describes the experimental behavior of the astrophysical Sfactor at energies from 0.9 to 4.0 MeV is shown by the solid line in figure 7. Our calculated S-factor at the energy 300 keV caused by the E2 process with the transition from the D wave to the GS of ...
... The sum of all three E2 transitions, which describes the experimental behavior of the astrophysical Sfactor at energies from 0.9 to 4.0 MeV is shown by the solid line in figure 7. Our calculated S-factor at the energy 300 keV caused by the E2 process with the transition from the D wave to the GS of ...
astronomical oxygen isotopic evidence for supernova
... O-rich oxygen ejected from stars in a nearby cluster that ended their lives as SNe II. Measurements of the relative abundances of all three stable oxygen isotopes place critical constraints on mixing between normal Galactic oxygen and this 18 O-rich ejecta. We explore this proposition, and its conse ...
... O-rich oxygen ejected from stars in a nearby cluster that ended their lives as SNe II. Measurements of the relative abundances of all three stable oxygen isotopes place critical constraints on mixing between normal Galactic oxygen and this 18 O-rich ejecta. We explore this proposition, and its conse ...
Chemical and mechanical instabilities in high energy heavy
... the phase transition take place. The coexistence line of a system with one conserved charge becomes in this case a two dimensional surface in (T, P, rS ) space, enclosing the region where mechanical and diffusive instabilities occur. 4. Antibaryon-baryon and strangeness phase transition By increasin ...
... the phase transition take place. The coexistence line of a system with one conserved charge becomes in this case a two dimensional surface in (T, P, rS ) space, enclosing the region where mechanical and diffusive instabilities occur. 4. Antibaryon-baryon and strangeness phase transition By increasin ...
L31 ON THE DISAPPEARANCE OF KILOHERTZ QUASI
... One critical question is whether the neutron star magnetosphere can be disengaged from the Keplerian disk at the last stable orbit. Studies have shown that the evolution of the magnetic field configuration is very complicated as the disk approaches the last stable orbit (e.g., Lai 1998), but the exa ...
... One critical question is whether the neutron star magnetosphere can be disengaged from the Keplerian disk at the last stable orbit. Studies have shown that the evolution of the magnetic field configuration is very complicated as the disk approaches the last stable orbit (e.g., Lai 1998), but the exa ...
Probing the stability of superheavy dark matter particles with high
... Figure 2: Limits (90% C. L.) on the dark matter lifetime τDM from various experiments, assuming two body decay φ → ν ν̄. The horizontal lines at 4.3 × 1017 s and 2.2 × 1019 s show respectively the age of Universe and the limit derived in [42] from the position of the first peak of the cosmic microw ...
... Figure 2: Limits (90% C. L.) on the dark matter lifetime τDM from various experiments, assuming two body decay φ → ν ν̄. The horizontal lines at 4.3 × 1017 s and 2.2 × 1019 s show respectively the age of Universe and the limit derived in [42] from the position of the first peak of the cosmic microw ...
DOE FUNDAMENTALS HANDBOOK NUCLEAR PHYSICS AND REACTOR THEORY Volume 1 of 2
... DOE Category A reactor training managers determined which materials should be included, and served as a primary reference in the initial development phase. Training guidelines from the commercial nuclear power industry, results of job and task analyses, and independent input from contractors and ope ...
... DOE Category A reactor training managers determined which materials should be included, and served as a primary reference in the initial development phase. Training guidelines from the commercial nuclear power industry, results of job and task analyses, and independent input from contractors and ope ...
Accretion and radial disk structure
... disks possess an inner rim (dust evaporation radius) • Tgas > Tdust in disk surface layers (tross <~ 1.0): gas and dust are not well coupled molecules can form • Disk dispersal can proceed via photoevaporation by the FUV/EUV of the central star: FUV evaporation proceeds from outside in ...
... disks possess an inner rim (dust evaporation radius) • Tgas > Tdust in disk surface layers (tross <~ 1.0): gas and dust are not well coupled molecules can form • Disk dispersal can proceed via photoevaporation by the FUV/EUV of the central star: FUV evaporation proceeds from outside in ...
the challenge of wide-field transit surveys: the case of
... and, because of the unknown orbital inclination, only a lower limit on the mass of the planet can be established. One of the most important results from the radial velocity planet detections was that the extrasolar planetary systems discovered so far are very different from the solar system, with ma ...
... and, because of the unknown orbital inclination, only a lower limit on the mass of the planet can be established. One of the most important results from the radial velocity planet detections was that the extrasolar planetary systems discovered so far are very different from the solar system, with ma ...
Dark Matter and Dark Energy
... The spectrum of each star is a combination of these lines, in proportion to the abundance of the elements in the star. If the star is moving toward or away from us, the whole spectrum is merely shifted to the right (bluer) or the left (redder). The combinations of lines are distinct enough to be rec ...
... The spectrum of each star is a combination of these lines, in proportion to the abundance of the elements in the star. If the star is moving toward or away from us, the whole spectrum is merely shifted to the right (bluer) or the left (redder). The combinations of lines are distinct enough to be rec ...
Formation of high-field magnetic white dwarfs from common envelopes
... two classes: AM Herculis (AM Her) (polars) and DQ Herculis (DQ Her) (intermediate polars). For reviews on AM Her and DQ Her systems, see refs. 9 and 10. Generally, AM Her systems are those in which both components of the binary are synchronously rotating at the orbital period. In this scenario, the ...
... two classes: AM Herculis (AM Her) (polars) and DQ Herculis (DQ Her) (intermediate polars). For reviews on AM Her and DQ Her systems, see refs. 9 and 10. Generally, AM Her systems are those in which both components of the binary are synchronously rotating at the orbital period. In this scenario, the ...
P-nuclei
p-Nuclei (p stands for proton-rich) are certain proton-rich, naturally occurring isotopes of some elements between selenium and mercury which cannot be produced in either s- or r-process.