mass transfer in close, rapidly accreting protobinaries
... R50 L4 yr, where L4 is the star’s KH GM12 /(R1 L1 ) 6200M10 luminosity in units of 104 L . This describes the time required for the star to adjust thermally to mass loss. The most important point to take from this calculation is that KH is by far the largest timescale in the problem, so tha ...
... R50 L4 yr, where L4 is the star’s KH GM12 /(R1 L1 ) 6200M10 luminosity in units of 104 L . This describes the time required for the star to adjust thermally to mass loss. The most important point to take from this calculation is that KH is by far the largest timescale in the problem, so tha ...
initial LIGO construction
... The effect of a propagating gravitational wave is to deform space in a quadrupolar form. The effect alternately elongates space in one direction while compressing space in an orthogonal direction and vice versa, with the frequency of the gravitational wave. A Michelson interferometer operating betwe ...
... The effect of a propagating gravitational wave is to deform space in a quadrupolar form. The effect alternately elongates space in one direction while compressing space in an orthogonal direction and vice versa, with the frequency of the gravitational wave. A Michelson interferometer operating betwe ...
Crowell - Conceptual Physics - IA
... The Metric System Every country in the world besides the U.S. has adopted a system of units known colloquially as the “metric system.” Even in the U.S., the system is used universally by scientists, and also by many engineers. This system is entirely decimal, thanks to the same eminently logical peo ...
... The Metric System Every country in the world besides the U.S. has adopted a system of units known colloquially as the “metric system.” Even in the U.S., the system is used universally by scientists, and also by many engineers. This system is entirely decimal, thanks to the same eminently logical peo ...
Slide 1
... • One of our favorite reasons is to look at the atomic hydrogen clouds in the Milky Way. • The clouds lay very far out from the galactic center (further out than our sun) and are rotating faster than they should be if they were just feeling the gravity of the mass we can “see” Big Bang, Black Early ...
... • One of our favorite reasons is to look at the atomic hydrogen clouds in the Milky Way. • The clouds lay very far out from the galactic center (further out than our sun) and are rotating faster than they should be if they were just feeling the gravity of the mass we can “see” Big Bang, Black Early ...
110 - Institute for Astronomy
... using time-dependent numerical MHD simulations, how such spurs could form (and subsequently fragment) from the interaction of a gaseous interstellar medium with a stellar spiral arm. We model the gaseous medium as a selfgravitating, magnetized, differentially-rotating, razor-thin disk. The basic flo ...
... using time-dependent numerical MHD simulations, how such spurs could form (and subsequently fragment) from the interaction of a gaseous interstellar medium with a stellar spiral arm. We model the gaseous medium as a selfgravitating, magnetized, differentially-rotating, razor-thin disk. The basic flo ...
Propagation of Electromagnetic Waves in and around
... Electromagnetic waves in magnetized plasmas have been well investigated for more than half century, aiming at ultimate goals of controlled fusion plasmas for energy production and space plasmas for launching human beings using spacecrafts. In a magnetized plasma, various kinds of wave branches are p ...
... Electromagnetic waves in magnetized plasmas have been well investigated for more than half century, aiming at ultimate goals of controlled fusion plasmas for energy production and space plasmas for launching human beings using spacecrafts. In a magnetized plasma, various kinds of wave branches are p ...
A propelling neutron star in the enigmatic Be-star γ Cassiopeia
... γ Cassiopeia (γ Cas), is known to be a binary system consisting of a Be-type star and a low-mass (M ∼ 1 M ) companion of unknown nature orbiting in the Be-disc plane. Here, we apply the quasi-spherical accretion theory on to a compact magnetized star and show that if the low-mass companion of γ Cas ...
... γ Cassiopeia (γ Cas), is known to be a binary system consisting of a Be-type star and a low-mass (M ∼ 1 M ) companion of unknown nature orbiting in the Be-disc plane. Here, we apply the quasi-spherical accretion theory on to a compact magnetized star and show that if the low-mass companion of γ Cas ...
Stellar interactions in dense and sparse star clusters
... Results. We find that the encounter rate strongly depends on the cluster density but remains rather unaffected by the size of the stellar population. This dependency translates directly into the effect on the encounter-induced disc-mass loss. The essential outcome of the simulations are: i) even in cl ...
... Results. We find that the encounter rate strongly depends on the cluster density but remains rather unaffected by the size of the stellar population. This dependency translates directly into the effect on the encounter-induced disc-mass loss. The essential outcome of the simulations are: i) even in cl ...
Clifford M. Will Theory and Experiment in Gravitational Physics 1993
... formalism that is necessary to carry out specific computations so that theoretical predictions can be compared with experimental findings. A completely up-to-date survey of experimental results is included, not only discussing Einstein's "classical" tests, such as the deflection of light and the per ...
... formalism that is necessary to carry out specific computations so that theoretical predictions can be compared with experimental findings. A completely up-to-date survey of experimental results is included, not only discussing Einstein's "classical" tests, such as the deflection of light and the per ...
Heating of the solar atmosphere by strong damping of Alfvйn waves
... assumed that the power must be supplied from below the photosphere, probably as upward flux of energy in some form of low frequency waves or turbulence. The upper limit on the kinetic energy associated with the thermal perturbations is rtV2th/2 ∼ 105 erg/cm3, where rt (∼2.8 × 10−7 g/cm3) and Vth (∼1 ...
... assumed that the power must be supplied from below the photosphere, probably as upward flux of energy in some form of low frequency waves or turbulence. The upper limit on the kinetic energy associated with the thermal perturbations is rtV2th/2 ∼ 105 erg/cm3, where rt (∼2.8 × 10−7 g/cm3) and Vth (∼1 ...
Pre-main sequence evolution
... density, which lead to changes in the dominant opacity contribution. => Stars alternate between convective and radiative phases. 2. The exact path of a PMS star in the Hertzsprung-Russel-Diagram, i.e. its luminosity-temperature evolution, depends on the stellar mass. Solar-type stars develop radiati ...
... density, which lead to changes in the dominant opacity contribution. => Stars alternate between convective and radiative phases. 2. The exact path of a PMS star in the Hertzsprung-Russel-Diagram, i.e. its luminosity-temperature evolution, depends on the stellar mass. Solar-type stars develop radiati ...
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Nova Layout [7x10] - Institut Laue
... through a narrow horizontal slit between a mirror below and an absorber/scatterer above it, which is used to scan the neutron density distribution above the mirror. This experimental technique allowed us to observe, for the first time, the non-continuous (discrete) behavior of the neutron flux. This ...
... through a narrow horizontal slit between a mirror below and an absorber/scatterer above it, which is used to scan the neutron density distribution above the mirror. This experimental technique allowed us to observe, for the first time, the non-continuous (discrete) behavior of the neutron flux. This ...
Understanding Mass-Loss and the Late Evolution of Intermediate
... conduction cooling might explain some cases (Steffen et al. 2008), it fails for the brightest and beststudied case, BD+303639 (Yu et al. 2009) for which high-resolution X-ray spectra reveal the elemental abundances of the shock-superheated gas and allow us to associate it with the undiluted, nucleos ...
... conduction cooling might explain some cases (Steffen et al. 2008), it fails for the brightest and beststudied case, BD+303639 (Yu et al. 2009) for which high-resolution X-ray spectra reveal the elemental abundances of the shock-superheated gas and allow us to associate it with the undiluted, nucleos ...
Identification of the optical counterparts of high-mass X
... uncertainty regions are given to a certain percentage of probability, what makes it possible that the true optical companion lies close but outside the X-ray error box. The size of the X-ray error radius of the sources reported in this work at the time of the observations was relatively large, typic ...
... uncertainty regions are given to a certain percentage of probability, what makes it possible that the true optical companion lies close but outside the X-ray error box. The size of the X-ray error radius of the sources reported in this work at the time of the observations was relatively large, typic ...
Edexcel GCSE
... (d) ‘Mobile phones do not use ionising radiation so they are completely safe.’ Discuss the accuracy of this statement about safety. ...
... (d) ‘Mobile phones do not use ionising radiation so they are completely safe.’ Discuss the accuracy of this statement about safety. ...
Life, gravity and the second law of thermodynamics
... of the universe. At the lowest level in the pyramid, the source of these almost unclumped baryons is baryon nonconservation [39]. The low initial gravitational entropy of the universe and baryon non-conservation are discussed further in Section 4. The sources of free energy in the universe are summa ...
... of the universe. At the lowest level in the pyramid, the source of these almost unclumped baryons is baryon nonconservation [39]. The low initial gravitational entropy of the universe and baryon non-conservation are discussed further in Section 4. The sources of free energy in the universe are summa ...