Additional Cosmology Images
... Earth is located 26,000 light-years away, out in one of the Milky Way's spiral arms. Though most of the objects seen in this image are located at the galactic center, the features above and below the galactic plane tend to lie closer to Earth. Scientists are intrigued by the giant lobes of dust exte ...
... Earth is located 26,000 light-years away, out in one of the Milky Way's spiral arms. Though most of the objects seen in this image are located at the galactic center, the features above and below the galactic plane tend to lie closer to Earth. Scientists are intrigued by the giant lobes of dust exte ...
aaswinter07ppt
... In January 2002, the star V838 Monocerotis erupted, generating intense interest, at least partly because of the exquisite pictures taken by the Hubble Space Telescope (see the background of this poster and the color picture below) ACS showing what is interpreted as a “light echo” from the eruption ( ...
... In January 2002, the star V838 Monocerotis erupted, generating intense interest, at least partly because of the exquisite pictures taken by the Hubble Space Telescope (see the background of this poster and the color picture below) ACS showing what is interpreted as a “light echo” from the eruption ( ...
Three-dimensional Simulation of Magnetized Cloud Fragmentation
... significantly reduce the timescale of collapsing core formation in subcritical clouds. It is of order several × 106 years for typical parameters, or ∼ 10 times less than found in the linear initial perturbation studies of Basu & Ciolek (2004), Ciolek & Basu (2006), and KBOY. Our supersonic perturbati ...
... significantly reduce the timescale of collapsing core formation in subcritical clouds. It is of order several × 106 years for typical parameters, or ∼ 10 times less than found in the linear initial perturbation studies of Basu & Ciolek (2004), Ciolek & Basu (2006), and KBOY. Our supersonic perturbati ...
Labeling the HR Diagram - Mastering Physics Answers
... Hint 2. Is the inverse square law for the apparent brightness of light always valid? Consider two stars that are identical to the Sun, but one is 10 times as far away as the other. According to the inverse square law for light, the more distant star should appear dimmer by a factor of 10 2 = 100. Bu ...
... Hint 2. Is the inverse square law for the apparent brightness of light always valid? Consider two stars that are identical to the Sun, but one is 10 times as far away as the other. According to the inverse square law for light, the more distant star should appear dimmer by a factor of 10 2 = 100. Bu ...
PHY104 - Introduction to Astrophysics
... with the slits at any one time. Now, let us put a special camera in place of the screen, that can detect each photon as it arrives at the screen. What we find is astonishing. The light is clearly behaving like photons, because we see each one hit the screen individually. The location of each photon ...
... with the slits at any one time. Now, let us put a special camera in place of the screen, that can detect each photon as it arrives at the screen. What we find is astonishing. The light is clearly behaving like photons, because we see each one hit the screen individually. The location of each photon ...
arXiv:astro-ph/0508448v1 22 Aug 2005
... of the mass of the pre-explosion star is lost. However, when a black hole (BH) is formed the amount of matter which falls back is not limited by the maximum NS mass. There is a peak in the system SN mass loss for pre-SN primary core masses somewhere around the boundary between NS and BH formation (F ...
... of the mass of the pre-explosion star is lost. However, when a black hole (BH) is formed the amount of matter which falls back is not limited by the maximum NS mass. There is a peak in the system SN mass loss for pre-SN primary core masses somewhere around the boundary between NS and BH formation (F ...
FILE
... molecules just processed by the neutrinos? There aren’t as many of them as there are neutrinos, but their interaction cross sections are >>> than those of the neutrinos. If the end state of the supernova is a black hole, the collapse to the black hole might result before any of the photons could esc ...
... molecules just processed by the neutrinos? There aren’t as many of them as there are neutrinos, but their interaction cross sections are >>> than those of the neutrinos. If the end state of the supernova is a black hole, the collapse to the black hole might result before any of the photons could esc ...
Next Generation Sunshine State Standards Chapter 24
... limited to determining the distances to only the closest stars. Recall from Chapter 21 that stellar parallax is the very slight back-and-forth shift of the apparent position of a nearby star due to the orbital motion of Earth around the Sun. The principle of parallax is easy to visualize. Close one ...
... limited to determining the distances to only the closest stars. Recall from Chapter 21 that stellar parallax is the very slight back-and-forth shift of the apparent position of a nearby star due to the orbital motion of Earth around the Sun. The principle of parallax is easy to visualize. Close one ...
Broggini
... Nucleosynthesis: from p-p chain, CNO, NeNa and MgAl cycles to the region beyond Fe Stellar evolution: from Main Sequence stars to thermonuclear supernovae and core collapse supernovae ...
... Nucleosynthesis: from p-p chain, CNO, NeNa and MgAl cycles to the region beyond Fe Stellar evolution: from Main Sequence stars to thermonuclear supernovae and core collapse supernovae ...
J: Chapter 4: Stars and Galaxies
... Parallax can be seen if you observe the same star when Earth is at two different points during its orbit around the Sun. The star’s position relative to more distant background stars will appear to change. Is star or farther from Earth? ...
... Parallax can be seen if you observe the same star when Earth is at two different points during its orbit around the Sun. The star’s position relative to more distant background stars will appear to change. Is star or farther from Earth? ...
AST1100 Lecture Notes
... Several stars show periodic changes in their apparent magnitudes. This was first thought to be caused by dark spots on a rotating star’s surface: When the dark spots were turned towards us, the star appeared fainter, when the spots were turned away from us, the star appeared brighter. Today we know ...
... Several stars show periodic changes in their apparent magnitudes. This was first thought to be caused by dark spots on a rotating star’s surface: When the dark spots were turned towards us, the star appeared fainter, when the spots were turned away from us, the star appeared brighter. Today we know ...
The fate of black hole singularities and the parameters of the
... holes in the observable universe is likely to be as high as one hundred per second1 , this may be taken to be the rate at which our ignorance about the universe is increasing due to our not knowing what lies behind all of these event horizons. When one adds quantum physics to the picture the puzzle ...
... holes in the observable universe is likely to be as high as one hundred per second1 , this may be taken to be the rate at which our ignorance about the universe is increasing due to our not knowing what lies behind all of these event horizons. When one adds quantum physics to the picture the puzzle ...
Neutron Stars
... were first proposed by Landau who suggested that in analogy to the support of white dwarfs by electron degeneracy pressure, neutron stars could be supported by neutron degeneracy pressure. Baade and Zwicky1 in 1934 firstsuggested neutron stars as being the remnants of supernovae. Tolman2 in 1939 produ ...
... were first proposed by Landau who suggested that in analogy to the support of white dwarfs by electron degeneracy pressure, neutron stars could be supported by neutron degeneracy pressure. Baade and Zwicky1 in 1934 firstsuggested neutron stars as being the remnants of supernovae. Tolman2 in 1939 produ ...
Letter to the Editor The formation of bipolar planetary nebulae
... results in this paper provide another one which can also be used to explain why not all known close binaries have bipolar PNe around them (Bond & Livio 1990). Stanghellini et al. (1993) did report a flat distribution of central masses for bipolar nebulae, but this was based on a smaller sample than ...
... results in this paper provide another one which can also be used to explain why not all known close binaries have bipolar PNe around them (Bond & Livio 1990). Stanghellini et al. (1993) did report a flat distribution of central masses for bipolar nebulae, but this was based on a smaller sample than ...
Test Ch. 27 Multiple Choice Identify the choice that best completes
... 25. In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a A. black dwarf. B. red supergiant. C. white dwarf. D. black hole. 26. In which stage of stellar evolution does combined hydrogen fusion and helium fusion cause a star’s outer shell to ...
... 25. In the last stage of stellar evolution following a supernova, stars too massive to form neutron stars may form a A. black dwarf. B. red supergiant. C. white dwarf. D. black hole. 26. In which stage of stellar evolution does combined hydrogen fusion and helium fusion cause a star’s outer shell to ...
Type II supernova
A Type II supernova (plural: supernovae or supernovas) results from the rapid collapse and violent explosion of a massive star. A star must have at least 8 times, and no more than 40–50 times, the mass of the Sun (M☉) for this type of explosion. It is distinguished from other types of supernovae by the presence of hydrogen in its spectrum. Type II supernovae are mainly observed in the spiral arms of galaxies and in H II regions, but not in elliptical galaxies.Stars generate energy by the nuclear fusion of elements. Unlike the Sun, massive stars possess the mass needed to fuse elements that have an atomic mass greater than hydrogen and helium, albeit at increasingly higher temperatures and pressures, causing increasingly shorter stellar life spans. The degeneracy pressure of electrons and the energy generated by these fusion reactions are sufficient to counter the force of gravity and prevent the star from collapsing, maintaining stellar equilibrium. The star fuses increasingly higher mass elements, starting with hydrogen and then helium, progressing up through the periodic table until a core of iron and nickel is produced. Fusion of iron or nickel produces no net energy output, so no further fusion can take place, leaving the nickel-iron core inert. Due to the lack of energy output allowing outward pressure, equilibrium is broken.When the mass of the inert core exceeds the Chandrasekhar limit of about 1.4 M☉, electron degeneracy alone is no longer sufficient to counter gravity and maintain stellar equilibrium. A cataclysmic implosion takes place within seconds, in which the outer core reaches an inward velocity of up to 23% of the speed of light and the inner core reaches temperatures of up to 100 billion kelvin. Neutrons and neutrinos are formed via reversed beta-decay, releasing about 1046 joules (100 foes) in a ten-second burst. The collapse is halted by neutron degeneracy, causing the implosion to rebound and bounce outward. The energy of this expanding shock wave is sufficient to accelerate the surrounding stellar material to escape velocity, forming a supernova explosion, while the shock wave and extremely high temperature and pressure briefly allow for theproduction of elements heavier than iron. Depending on initial size of the star, the remnants of the core form a neutron star or a black hole. Because of the underlying mechanism, the resulting nova is also described as a core-collapse supernova.There exist several categories of Type II supernova explosions, which are categorized based on the resulting light curve—a graph of luminosity versus time—following the explosion. Type II-L supernovae show a steady (linear) decline of the light curve following the explosion, whereas Type II-P display a period of slower decline (a plateau) in their light curve followed by a normal decay. Type Ib and Ic supernovae are a type of core-collapse supernova for a massive star that has shed its outer envelope of hydrogen and (for Type Ic) helium. As a result, they appear to be lacking in these elements.