Constellations - Mayo Dark Sky Park
... In Greek mythology, Orion was a mighty giant and hunter who boasted that he could slay any creature on Earth. There are many legends of his special powers such as walking on water, and various stories of how he was killed. One story is that Diana, the archer-goddess with whom Orion was a favourite w ...
... In Greek mythology, Orion was a mighty giant and hunter who boasted that he could slay any creature on Earth. There are many legends of his special powers such as walking on water, and various stories of how he was killed. One story is that Diana, the archer-goddess with whom Orion was a favourite w ...
Synthetic color-magnitude diagrams: the ingredients
... Up to now, there are few observational constraints on the overall mass-ratio distribution of the binary population. One of the few measures of f(q) for binary systems, comes from Fisher et al. (2005) who estimated the q distribution function from spectroscopic observations of field binaries within ...
... Up to now, there are few observational constraints on the overall mass-ratio distribution of the binary population. One of the few measures of f(q) for binary systems, comes from Fisher et al. (2005) who estimated the q distribution function from spectroscopic observations of field binaries within ...
EXAM II REVIEW - University of Maryland: Department of
... What does Einstein’s famous equation mean? How can we apply it to the Sun? ...
... What does Einstein’s famous equation mean? How can we apply it to the Sun? ...
Spatial Structure Evolution of Star Clusters
... • 2MASS good for study of open clusters - Full data release expected end of 2002 - Deep IR images to differentiate the MS (IR camera with Nagoya U & PMO) • Stars in an open cluster, regardless of masses, are concentrated progressively toward the center. • The youngest star clusters show evidence of ...
... • 2MASS good for study of open clusters - Full data release expected end of 2002 - Deep IR images to differentiate the MS (IR camera with Nagoya U & PMO) • Stars in an open cluster, regardless of masses, are concentrated progressively toward the center. • The youngest star clusters show evidence of ...
Essay - CLC Charter School
... scientists think that type 1b supernovae are actually type 2. The hydrogen was ...
... scientists think that type 1b supernovae are actually type 2. The hydrogen was ...
White dwarfs
... It leads R = 18 000 km, ρ = 7 104 g/cm3 (Moderne values : Teff = 24 000 K , R = 2000 km , ρ = 6 107 g/cm3 ) - Eddington 1926 : “we have a star of a mass about equal to the sun and a radius much less than Uranus [...] it seems likely that the ordinary failure of the gas laws due to finite sizes of mo ...
... It leads R = 18 000 km, ρ = 7 104 g/cm3 (Moderne values : Teff = 24 000 K , R = 2000 km , ρ = 6 107 g/cm3 ) - Eddington 1926 : “we have a star of a mass about equal to the sun and a radius much less than Uranus [...] it seems likely that the ordinary failure of the gas laws due to finite sizes of mo ...
Lecture15
... and cloud heats up. 3. A quasi-stable protostar forms, radiating gravitational potential energy 4. Collapsing material continues to accrete onto a disk 5. Core collapse continues when dust vapourizes and H2 dissociates. 6. Nuclear fusion begins, and an energetic jet expels material and angular momen ...
... and cloud heats up. 3. A quasi-stable protostar forms, radiating gravitational potential energy 4. Collapsing material continues to accrete onto a disk 5. Core collapse continues when dust vapourizes and H2 dissociates. 6. Nuclear fusion begins, and an energetic jet expels material and angular momen ...
Star Formation
... • Gravitational converted to thermal energy • Gas & dust radiate so collapse continues until • Cloud becomes opaque and thus a protostar ...
... • Gravitational converted to thermal energy • Gas & dust radiate so collapse continues until • Cloud becomes opaque and thus a protostar ...
Stellar balancing act — dynamic equilibrium. A star spends most of
... (and down) the rotation axis. The generic phrase for this jet mechanism is the “tube of toothpaste effect.” It is an open question whether or not sufficiently strong jets to explode a star can be produced in this way when a neutron star forms, but the Crab pulsar, other young pulsars, Cas A and SN 1 ...
... (and down) the rotation axis. The generic phrase for this jet mechanism is the “tube of toothpaste effect.” It is an open question whether or not sufficiently strong jets to explode a star can be produced in this way when a neutron star forms, but the Crab pulsar, other young pulsars, Cas A and SN 1 ...
General Relativity
... Einstein said that the warping of spacetime alters the path of light as it passes near the source of a strong gravitational field (i.e. photons follow geodesics). When viewing light from a star, the position of the star will appear different if passing near a massive object (like the Sun). = 4GM/b ...
... Einstein said that the warping of spacetime alters the path of light as it passes near the source of a strong gravitational field (i.e. photons follow geodesics). When viewing light from a star, the position of the star will appear different if passing near a massive object (like the Sun). = 4GM/b ...
Lecture Note
... side of its orbit to the other (the largest separation of two viewpoints possibly from the Earth) ...
... side of its orbit to the other (the largest separation of two viewpoints possibly from the Earth) ...
Slide 1
... (the atoms with second ionization potentials close to 13.6 & 24.6 eV) in stellar atmosphere and steal an electron from them. The resonance energies are the ionization potentials of hydrogen and helium (13.6 & 24.6 eV). The newly ionized atoms fly away at high velocities. The direction of this fly co ...
... (the atoms with second ionization potentials close to 13.6 & 24.6 eV) in stellar atmosphere and steal an electron from them. The resonance energies are the ionization potentials of hydrogen and helium (13.6 & 24.6 eV). The newly ionized atoms fly away at high velocities. The direction of this fly co ...
script
... • stellar wind is coupled to magnetic field lines and thus to stellar rotation • therefore, stellar wind takes away angular momentum and the stellar rotation is braked ...
... • stellar wind is coupled to magnetic field lines and thus to stellar rotation • therefore, stellar wind takes away angular momentum and the stellar rotation is braked ...
Click here to the PowerPoint
... Interestingly, this dust and gas that is created can be remade into ‘new generation’ stars and planets. ...
... Interestingly, this dust and gas that is created can be remade into ‘new generation’ stars and planets. ...
Star Types - University of Massachusetts Amherst
... Parallax would be easier to measure if 1) the stars were further away. 2) Earth's orbit were larger. 3) Earth moved backwards along its orbit. 4) none of these. ...
... Parallax would be easier to measure if 1) the stars were further away. 2) Earth's orbit were larger. 3) Earth moved backwards along its orbit. 4) none of these. ...
Model of Stars—5 Oct Outline •
... What can I do to make the same hot‐plate at the same setting burn my hand and not burn my hand? (Without modifying the sun, what can I do to make the sun brighter or fainter?) A. B. ...
... What can I do to make the same hot‐plate at the same setting burn my hand and not burn my hand? (Without modifying the sun, what can I do to make the sun brighter or fainter?) A. B. ...
X-ray output should be time variable
... Bright stars in the spectral range earlier than about B3 are soft X-ray sources, with LX ~ 10-7 LBol THEORY •O star X-ray emission comes from shock-heated gas present in their stellar winds; for B stars, the situation is more uncertain, and their Xrays may be related to magnetic fields, at least in ...
... Bright stars in the spectral range earlier than about B3 are soft X-ray sources, with LX ~ 10-7 LBol THEORY •O star X-ray emission comes from shock-heated gas present in their stellar winds; for B stars, the situation is more uncertain, and their Xrays may be related to magnetic fields, at least in ...
neutron star - The University of Chicago
... astrophysics and involves virtually all fields of modern physics. ➢ Multi-dimensional supercomputer simulations key to understanding core-collapse SNe. ➢ Neutrinos are emitted en-masse during core-collapse and play an important role in reviving the SN shock BUT even small changes in the neutrino hea ...
... astrophysics and involves virtually all fields of modern physics. ➢ Multi-dimensional supercomputer simulations key to understanding core-collapse SNe. ➢ Neutrinos are emitted en-masse during core-collapse and play an important role in reviving the SN shock BUT even small changes in the neutrino hea ...
The Milky Way Galaxy
... - at least 30 kpc across - contains globular clusters, old stars, little gas and dust, much "dark matter" - roughly spherical ...
... - at least 30 kpc across - contains globular clusters, old stars, little gas and dust, much "dark matter" - roughly spherical ...
Slide 1
... • As the core of a star collapses to form a neutron star, it spins fasters and faster • Its magnetic field becomes concentrated, and this results in a beam of radio waves coming out of its ...
... • As the core of a star collapses to form a neutron star, it spins fasters and faster • Its magnetic field becomes concentrated, and this results in a beam of radio waves coming out of its ...
31 October: Supernovae and Neutron Stars
... • Radius versus mass relation for neutron star • Notice size of neutron star • Masses extend above Chandrasekhar limit ...
... • Radius versus mass relation for neutron star • Notice size of neutron star • Masses extend above Chandrasekhar limit ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.