Surface temperature distribution and absorption features in Isolated
... e and νe . Neutrinos play an important role in supernova explosions, since they carry away a great amount of the released energy. The collapse ends when the star central density reaches n0 , this event gives rise to a shock wave which propagates about 100-200 km before it stops, having lost energy t ...
... e and νe . Neutrinos play an important role in supernova explosions, since they carry away a great amount of the released energy. The collapse ends when the star central density reaches n0 , this event gives rise to a shock wave which propagates about 100-200 km before it stops, having lost energy t ...
A physical interpretation of the `red Sirius` anomaly
... interstellar extinction (Section 3.1). Both Rayleigh and aerosol components of atmospheric extinction scale in proportion to exp 2h=H, where h is the altitude of the observer and H is the appropriate scaleheight: typical values of H for Rayleigh and aerosol extinction are 8 and 1.5 km, respectively ...
... interstellar extinction (Section 3.1). Both Rayleigh and aerosol components of atmospheric extinction scale in proportion to exp 2h=H, where h is the altitude of the observer and H is the appropriate scaleheight: typical values of H for Rayleigh and aerosol extinction are 8 and 1.5 km, respectively ...
They might be giants: luminosity class, planet frequency, and planet
... The NASA Kepler mission (Borucki et al. 2010) has ushered exoplanet science into a new phase of analysis based on the statistics of large samples. Among the more elementary statistics derived from Kepler results are the planet occurrence around stars (Howard et al. 2011, henceforth H11), the distrib ...
... The NASA Kepler mission (Borucki et al. 2010) has ushered exoplanet science into a new phase of analysis based on the statistics of large samples. Among the more elementary statistics derived from Kepler results are the planet occurrence around stars (Howard et al. 2011, henceforth H11), the distrib ...
Observation of Circumstellar Disks: Dust and Gas Components
... Before the 1980s, the existence of protoplanetary disks of gas and dust around stars similar to the young Sun (4.5 b.y. ago) was inferred from the theory of stellar formation (e.g., Shakura and Suynaev, 1973), the knowledge of our own planetary system, and dedicated models of the protosolar nebula. ...
... Before the 1980s, the existence of protoplanetary disks of gas and dust around stars similar to the young Sun (4.5 b.y. ago) was inferred from the theory of stellar formation (e.g., Shakura and Suynaev, 1973), the knowledge of our own planetary system, and dedicated models of the protosolar nebula. ...
Clusters of Galaxies
... 1. Rotation Curves in Galaxies: The rotation velocities of galaxies at large radii are constant. This is not what one would expect if the luminous matter (stars and gas) were all the matter. One can work out what the Dark Matter “Halo” looks like from this. 2. Velocities in Clusters of Galaxies: A ...
... 1. Rotation Curves in Galaxies: The rotation velocities of galaxies at large radii are constant. This is not what one would expect if the luminous matter (stars and gas) were all the matter. One can work out what the Dark Matter “Halo” looks like from this. 2. Velocities in Clusters of Galaxies: A ...
they might be giants: luminosity class, planet occurrence, and planet
... Nevertheless, Kepler data has been used to draw two important conclusions about late-type exoplanet hosts. First, H11 found that the frequency of stars with planets on close-in (P< 50d) orbits rises with decreasing effective temperature through early K-type and that an even higher fraction of M dwar ...
... Nevertheless, Kepler data has been used to draw two important conclusions about late-type exoplanet hosts. First, H11 found that the frequency of stars with planets on close-in (P< 50d) orbits rises with decreasing effective temperature through early K-type and that an even higher fraction of M dwar ...
Accretion and Current Discs Controlled by Strong Magnetic Field
... mass-exchange binary. Finally, for a slowly rotating neutron star, the ejection changes to accretion. The relativistic outflowing momentum flux in ejectors is always larger than the ram pressure of the surrounding material, therefore they never accrete. This is typical for either active or dead puls ...
... mass-exchange binary. Finally, for a slowly rotating neutron star, the ejection changes to accretion. The relativistic outflowing momentum flux in ejectors is always larger than the ram pressure of the surrounding material, therefore they never accrete. This is typical for either active or dead puls ...
stellar rotation in m35: mass–period relations, spin
... problem. The fastest spinning stars in the youngest clusters cannot be explained from Skumanich-style spin-down (Skumanich 1972) of the fastest spinning T Tauri stars. The rapid rotators can be explained only by introducing “magnetic saturation” ...
... problem. The fastest spinning stars in the youngest clusters cannot be explained from Skumanich-style spin-down (Skumanich 1972) of the fastest spinning T Tauri stars. The rapid rotators can be explained only by introducing “magnetic saturation” ...
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... field, which can be used as a first study to be followed by more sophisticated models. We show that hypothetical Earth-like planets with similar terrestrial magnetisation (∼ 1 G) orbiting at the inner (outer) edge of the habitable zone of these stars would present magnetospheres that extend at most ...
... field, which can be used as a first study to be followed by more sophisticated models. We show that hypothetical Earth-like planets with similar terrestrial magnetisation (∼ 1 G) orbiting at the inner (outer) edge of the habitable zone of these stars would present magnetospheres that extend at most ...
Effects of M dwarf magnetic fields on potentially habitable planets
... field, which can be used as a first study to be followed by more sophisticated models. We show that hypothetical Earth-like planets with similar terrestrial magnetisation (∼1 G) orbiting at the inner (outer) edge of the habitable zone of these stars would present magnetospheres that extend at most u ...
... field, which can be used as a first study to be followed by more sophisticated models. We show that hypothetical Earth-like planets with similar terrestrial magnetisation (∼1 G) orbiting at the inner (outer) edge of the habitable zone of these stars would present magnetospheres that extend at most u ...
Section IV High-Energy Astrophysics and Cosmology
... where MBH is the mass of a black hole, f is a virial parameter that defines the geometry, velocity field and orientation of BLR, RBLR is the radius of BLR and VBLR is the velocity dispersion that is usually measured as the full width of the emission line at a half of height in the radiation spectrum ...
... where MBH is the mass of a black hole, f is a virial parameter that defines the geometry, velocity field and orientation of BLR, RBLR is the radius of BLR and VBLR is the velocity dispersion that is usually measured as the full width of the emission line at a half of height in the radiation spectrum ...
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 ...
The Classification of Galaxies By Daniel Underwood Contents The
... types: barred spirals (SB) and non-barred (SA), although if distinction between the two happens to be difficult then “SAB” is used for denotation. A barred spiral is a spiral type (pictured on the right) but with a bar-like feature in the centre off which the spirals emanate. Like with elliptical ga ...
... types: barred spirals (SB) and non-barred (SA), although if distinction between the two happens to be difficult then “SAB” is used for denotation. A barred spiral is a spiral type (pictured on the right) but with a bar-like feature in the centre off which the spirals emanate. Like with elliptical ga ...
PHY418 Particle Astrophysics
... gas), but only CCSNe form compact objects (neutron stars/black holes) ...
... gas), but only CCSNe form compact objects (neutron stars/black holes) ...
Molecules Detected in Interstellar Space
... electric quadrupole transitions between rotational or ro-vibrational levels can be observed. Therefore, low rotational transitions of the CO molecule, although about by 10-4 less abundant than H2 , have become the most important tool to study the large scale distribution of the molecular gas in the ...
... electric quadrupole transitions between rotational or ro-vibrational levels can be observed. Therefore, low rotational transitions of the CO molecule, although about by 10-4 less abundant than H2 , have become the most important tool to study the large scale distribution of the molecular gas in the ...
THE PERIOD OF ROTATION OF THE SUN
... the gas physics to create the models; we assumed the gas was thin enough that once an Xray photon is emitted by an atom, it escapes the gas (the gas is what astronomers call “optically thin”). In reality, the gas is probably dense enough in some regions to reabsorb the X-rays, and this changes the r ...
... the gas physics to create the models; we assumed the gas was thin enough that once an Xray photon is emitted by an atom, it escapes the gas (the gas is what astronomers call “optically thin”). In reality, the gas is probably dense enough in some regions to reabsorb the X-rays, and this changes the r ...
Sample syllabus 2 - Johns Hopkins Center for Talented Youth
... Course Description: When the sun runs out of fuel, will it explode in a giant supernova or fade out into a white dwarf? Does every galaxy revolve around a super-massive black hole? Will the universe continue to expand, or will it eventually collapse back upon itself in a reversal of the Big Bang? As ...
... Course Description: When the sun runs out of fuel, will it explode in a giant supernova or fade out into a white dwarf? Does every galaxy revolve around a super-massive black hole? Will the universe continue to expand, or will it eventually collapse back upon itself in a reversal of the Big Bang? As ...
ISP 205: Visions of the Universe
... • How did we come to be? • Big Bang starts the expansion of the universe. • Early universe contained only the elements hydrogen and helium. • All other elements were made in stars and recycled into new generations of stars within galaxies. • We are “star stuff” ...
... • How did we come to be? • Big Bang starts the expansion of the universe. • Early universe contained only the elements hydrogen and helium. • All other elements were made in stars and recycled into new generations of stars within galaxies. • We are “star stuff” ...
The Milky Way`s external disc constrained by 2MASS star counts
... Methods. We use the Two Micron All Sky Survey (hereafter 2MASS) along with the Stellar Population Synthesis Model of the Galaxy, developed in Besançon, to constrain the external disc parameters, such as its scale length, its cutoff radius, and the slope of the warp. To properly interpret the observat ...
... Methods. We use the Two Micron All Sky Survey (hereafter 2MASS) along with the Stellar Population Synthesis Model of the Galaxy, developed in Besançon, to constrain the external disc parameters, such as its scale length, its cutoff radius, and the slope of the warp. To properly interpret the observat ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.