Most-likely Black Holes
... If BH formation through Case B (in giant stage) is possible, contrary to the observation, we should see about 10 times more BHs in our Galaxy. ...
... If BH formation through Case B (in giant stage) is possible, contrary to the observation, we should see about 10 times more BHs in our Galaxy. ...
Galactic components Structure and kinematics
... statistics assuming some prior information concerning the stellar population. In practice, •(1) They assume discrete galactic components, each ...
... statistics assuming some prior information concerning the stellar population. In practice, •(1) They assume discrete galactic components, each ...
Mixing in massive stellar mergers
... The guiding idea of our method is Archimedes’ principle. To determine how fluid will redistribute itself when brought out of equilibrium, perhaps by a stellar merger, we need to consider densities: a fluid element with a greater density than its environment will accelerate downward, while one with a ...
... The guiding idea of our method is Archimedes’ principle. To determine how fluid will redistribute itself when brought out of equilibrium, perhaps by a stellar merger, we need to consider densities: a fluid element with a greater density than its environment will accelerate downward, while one with a ...
Giant molecular clouds: star factories
... adopt the empirical Schmidt–Kennicutt relation to assign star formation rates based on the density; rather the star formation rate is an output of the simulations. However, we still need to use an unknown efficiency parameter, because we do not have the resolution to model individual stars forming; ...
... adopt the empirical Schmidt–Kennicutt relation to assign star formation rates based on the density; rather the star formation rate is an output of the simulations. However, we still need to use an unknown efficiency parameter, because we do not have the resolution to model individual stars forming; ...
Astronomy 112: The Physics of Stars Class 18 Notes: Neutron Stars
... as the magnetic field. The period, which is simply P = 2π/ω, decreases by the same factor. As with the magnetic field, we’re not exactly sure what rotation rates should be for massive star cores, but we can guess based on white dwarfs. The fastest rotating of these, which are probably the youngest a ...
... as the magnetic field. The period, which is simply P = 2π/ω, decreases by the same factor. As with the magnetic field, we’re not exactly sure what rotation rates should be for massive star cores, but we can guess based on white dwarfs. The fastest rotating of these, which are probably the youngest a ...
Geoscience
... New Earth is formed near what feature? For those of you who like to split hairs, the age of the atoms are the same. We speak of the time when the molten material hardened into stone. a. Subduction zone c. Lithosphere b. Mid-ocean ridge d. Epicenters Plates tend to move about the Earth. Why do they ...
... New Earth is formed near what feature? For those of you who like to split hairs, the age of the atoms are the same. We speak of the time when the molten material hardened into stone. a. Subduction zone c. Lithosphere b. Mid-ocean ridge d. Epicenters Plates tend to move about the Earth. Why do they ...
Observing binaries with Gaia
... • Millions of binaries of all kinds • Complete statistics near sun • Partial statistics over large parts of the Galaxy • Orbits and masses ...
... • Millions of binaries of all kinds • Complete statistics near sun • Partial statistics over large parts of the Galaxy • Orbits and masses ...
ph507lecnote06
... • Four very low mass planets have been detected ….20 earth masses. • Planet occurrence rises rapidly with stellar metallicity • Multiple planets are common, often in resonant orbits Microlensing: two strong detections, low detection rate imply upper limit of ~1/3 on the fraction of lensing stars (~ ...
... • Four very low mass planets have been detected ….20 earth masses. • Planet occurrence rises rapidly with stellar metallicity • Multiple planets are common, often in resonant orbits Microlensing: two strong detections, low detection rate imply upper limit of ~1/3 on the fraction of lensing stars (~ ...
Короткий гамма-всплеск GRB 130603: открытие килоновой
... Submitted on 20 Jun 2013arXiv:1306.4971v1 The nature of short duration gamma-ray bursts (S-GRBs) represents one of the great unsolved mysteries of astrophysics today. While a favoured model for their origin is the merger of two compact objects (e.g., neutron stars) this lacks a smoking gun signature ...
... Submitted on 20 Jun 2013arXiv:1306.4971v1 The nature of short duration gamma-ray bursts (S-GRBs) represents one of the great unsolved mysteries of astrophysics today. While a favoured model for their origin is the merger of two compact objects (e.g., neutron stars) this lacks a smoking gun signature ...
The Michelson Interferometer
... given wavelength, 0 546nm , incident on the beam-splitter. There is a cell of air placed along that arm of the interferometer which does not have the compensating plate. This cell is initially evacuated, and air is thereafter allowed to leak back into the cell. As the air leaks back in, the numbe ...
... given wavelength, 0 546nm , incident on the beam-splitter. There is a cell of air placed along that arm of the interferometer which does not have the compensating plate. This cell is initially evacuated, and air is thereafter allowed to leak back into the cell. As the air leaks back in, the numbe ...
Physics Tute Sheet-6 - College of Engineering Roorkee
... that the characteristic direction of a sheet is rotated through 20o with respect to the preceding one. What fraction of the incident light is transmitted? Ans. 0.304 5. Calculate the thickness of a calcite plate which would convert plane polarized light into elliptically polarized light. The princip ...
... that the characteristic direction of a sheet is rotated through 20o with respect to the preceding one. What fraction of the incident light is transmitted? Ans. 0.304 5. Calculate the thickness of a calcite plate which would convert plane polarized light into elliptically polarized light. The princip ...
Les Houches 1996 Winter School
... • Estimate the relative contributions of optically thick and optically thin parts of a disk to mm-wave light – Assume a surface density law: S(r)~ r-p – Find the radius, rt(), where t() = 1 – What happens to relative contributions of thick/thin emission as wavelength varies? – Show how this dege ...
... • Estimate the relative contributions of optically thick and optically thin parts of a disk to mm-wave light – Assume a surface density law: S(r)~ r-p – Find the radius, rt(), where t() = 1 – What happens to relative contributions of thick/thin emission as wavelength varies? – Show how this dege ...
Selected topics in the evolution of low
... way just described, on the other hand, though certainly not perfect, should somehow more realistically describe the evolutionary paths of such stars, since they – by definition – more successfully reproduce the internal structure of the Sun. To close, we note that van Saders & Pinsonneault [89] rece ...
... way just described, on the other hand, though certainly not perfect, should somehow more realistically describe the evolutionary paths of such stars, since they – by definition – more successfully reproduce the internal structure of the Sun. To close, we note that van Saders & Pinsonneault [89] rece ...
01 - MrPetersenScience
... a. Groups of elements have the same spectral lines. b. Individual elements may have the same spectral lines. c. Each element has a unique pattern of spectral lines. d. Each group of elements has unique spectral lines. _____ 9. What element makes up about 75% of the sun’s mass? a. helium b. iron c. h ...
... a. Groups of elements have the same spectral lines. b. Individual elements may have the same spectral lines. c. Each element has a unique pattern of spectral lines. d. Each group of elements has unique spectral lines. _____ 9. What element makes up about 75% of the sun’s mass? a. helium b. iron c. h ...
THE SUN - University of Mass Lowell, Space Science Laboratory
... The optical (as seen in Hydrogen-alpha light) classification of a flare is made using a two-character designation. For example, a 1B designation indicates a ``brilliant” intensity flare covering a corrected area between 100 and 249 millionths of the solar hemisphere. ...
... The optical (as seen in Hydrogen-alpha light) classification of a flare is made using a two-character designation. For example, a 1B designation indicates a ``brilliant” intensity flare covering a corrected area between 100 and 249 millionths of the solar hemisphere. ...
White top-emitting organic light-emitting diodes using one
... general, due to the differences in the refractive index between the cathode metal of the TEOLED device and air, some of light emitted inside of the TEOLED device cannot be extracted through the semitransparent cathode metal by Snell's law. That is, when the light passes through from a medium with a ...
... general, due to the differences in the refractive index between the cathode metal of the TEOLED device and air, some of light emitted inside of the TEOLED device cannot be extracted through the semitransparent cathode metal by Snell's law. That is, when the light passes through from a medium with a ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.