neutron star - The University of Chicago
... capable to remove some of the outer, less gravitationally-bound layers. This wave-driven mass loss happens preferentially in either low mass (yet still massive) stars or lower metallicity more massive stars. Within a few months to a decade prior to CC up to ~1 Msun of material can be expelled. ...
... capable to remove some of the outer, less gravitationally-bound layers. This wave-driven mass loss happens preferentially in either low mass (yet still massive) stars or lower metallicity more massive stars. Within a few months to a decade prior to CC up to ~1 Msun of material can be expelled. ...
Linking Asteroids and Meteorites through Reflectance
... • At the dawn of the 20th century, most astronomers thought that the Milky Way Galaxy was the universe, and it measured only a few thousand light-years across. ...
... • At the dawn of the 20th century, most astronomers thought that the Milky Way Galaxy was the universe, and it measured only a few thousand light-years across. ...
What is a galaxy - University of Melbourne
... ★Distant galaxies move away from us as Universe expands ...
... ★Distant galaxies move away from us as Universe expands ...
WHERE DO ELEMENTS COME FROM?
... • Alpher and Gamow also predicted that the heat present during the first few minutes is still present in the universe • The universe should have now expanded and be on average only a few Kelvins hot • The wave length of this radiation should be in the range of microwaves ...
... • Alpher and Gamow also predicted that the heat present during the first few minutes is still present in the universe • The universe should have now expanded and be on average only a few Kelvins hot • The wave length of this radiation should be in the range of microwaves ...
Observational properties of stars
... remnant is associated with this event, and currently it is thought to have been a Type Ia. SN1054 – (July 4) in Taurus, observed by Arabic, Chinese, Japanese astronomers, peak of V = -6, again brighter than Venus. Currently the supernova can be seen as the Crab Nebula (M1). This is a Type II superno ...
... remnant is associated with this event, and currently it is thought to have been a Type Ia. SN1054 – (July 4) in Taurus, observed by Arabic, Chinese, Japanese astronomers, peak of V = -6, again brighter than Venus. Currently the supernova can be seen as the Crab Nebula (M1). This is a Type II superno ...
PowerPoint - Chandra X
... Chandra Science Highlights IC 443: A Supernova Remnant with a Newly Discovered Neutron Star 5,000 light years from Earth This Chandra image shows a point-like source of X-rays inside a cloud of high energy particles which is embedded in the supernova remnant IC443. Using this image, along with radio ...
... Chandra Science Highlights IC 443: A Supernova Remnant with a Newly Discovered Neutron Star 5,000 light years from Earth This Chandra image shows a point-like source of X-rays inside a cloud of high energy particles which is embedded in the supernova remnant IC443. Using this image, along with radio ...
Document
... 1923, Hubble found dozens of these variable stars in Andromeda, and determined their distance. Andromeda contains a spiral-shaped galaxy that, at a distance of 2.2 million light-years, is the farthest object visible to the naked eye. He calculated that Andromeda must be at least 10 times farther awa ...
... 1923, Hubble found dozens of these variable stars in Andromeda, and determined their distance. Andromeda contains a spiral-shaped galaxy that, at a distance of 2.2 million light-years, is the farthest object visible to the naked eye. He calculated that Andromeda must be at least 10 times farther awa ...
B - Department of Physics and Astronomy
... 5. The event that follows the asymptotic giant branch (AGB) phase in the life of a low-mass star is: A. *the ejection of a plantary nebula B. core collapse and a supernova explosion C. helium flash and the start of helium burning in the core D. the onset of hydrogen burning in the core 6. One diffic ...
... 5. The event that follows the asymptotic giant branch (AGB) phase in the life of a low-mass star is: A. *the ejection of a plantary nebula B. core collapse and a supernova explosion C. helium flash and the start of helium burning in the core D. the onset of hydrogen burning in the core 6. One diffic ...
Lecture 10 - Concord University
... In the early 1900s `novae’ were sometimes observed in other galaxies and were used to help set the distances to galaxies. But, when it became clear that even the nearest galaxies were much further away than anyone had thought this suggested that the extragalactic `nova’ were much brighter than G ...
... In the early 1900s `novae’ were sometimes observed in other galaxies and were used to help set the distances to galaxies. But, when it became clear that even the nearest galaxies were much further away than anyone had thought this suggested that the extragalactic `nova’ were much brighter than G ...
Solutions - UC Berkeley Astronomy w
... The original Big Bang theory did not explain the incredible uniformity of the Universe nor its flat geometry. By uniformity we mean that when we look at the CMB in opposite directions in the sky, they have the same temperature (with small differences in ripples), but these two regions could never ha ...
... The original Big Bang theory did not explain the incredible uniformity of the Universe nor its flat geometry. By uniformity we mean that when we look at the CMB in opposite directions in the sky, they have the same temperature (with small differences in ripples), but these two regions could never ha ...
1 Dr. Steve Hawley Volume 35 Number 04 APRIL 2009
... point source with an absolute visual magnitude of -10.3. The progenitor was so bright that it probably belonged to a class of stars called Luminous Blue Variables (LBVs), "because no other type of star is as intrinsically brilliant," says Gal-Yam. As an LBV-class star evolves it sheds much of its ma ...
... point source with an absolute visual magnitude of -10.3. The progenitor was so bright that it probably belonged to a class of stars called Luminous Blue Variables (LBVs), "because no other type of star is as intrinsically brilliant," says Gal-Yam. As an LBV-class star evolves it sheds much of its ma ...
Slide 1
... Spiral Galaxy which resembles a pinwheel. With arms spiraling out. Elliptical Galaxies have almost a shape that is a ...
... Spiral Galaxy which resembles a pinwheel. With arms spiraling out. Elliptical Galaxies have almost a shape that is a ...
ASTR 1120-001 Final Examination Phil Armitage, Bruce Ferguson
... In a cluster surrounding the central black hole In the same way as the stars and gas ...
... In a cluster surrounding the central black hole In the same way as the stars and gas ...
Last Year`s Exam, Section B
... the Sun can be found anywhere. Brighter main-sequence stars are more massive. Luminosity increases much faster than mass: a star 10 times as massive is 10000 times as luminous. Therefore massive stars last for much shorter time on main sequence (poorer ratio of power used to fuel available!) ...
... the Sun can be found anywhere. Brighter main-sequence stars are more massive. Luminosity increases much faster than mass: a star 10 times as massive is 10000 times as luminous. Therefore massive stars last for much shorter time on main sequence (poorer ratio of power used to fuel available!) ...
X-Ray Astronomy and Accretion Phenomena
... have large mass loss rates in the form of a large stellar wind, much stronger than the solar wind. The shocks in the wind heat the plasma which then emits X-rays. Observations spread out in time of these stars has allows researchers to show that sometimes the wind is confined to a plane by a magneti ...
... have large mass loss rates in the form of a large stellar wind, much stronger than the solar wind. The shocks in the wind heat the plasma which then emits X-rays. Observations spread out in time of these stars has allows researchers to show that sometimes the wind is confined to a plane by a magneti ...
Constellations - Sierra Star Gazers
... has the distinction of being one of the largest and brightest stars in the known galaxy. While too far for a good parallax distance calculation, Mu Cephei is thought to be about 2400 light years away. With a radius 1,650 times larger than our Sun’s, if placed in the center of our solar system the su ...
... has the distinction of being one of the largest and brightest stars in the known galaxy. While too far for a good parallax distance calculation, Mu Cephei is thought to be about 2400 light years away. With a radius 1,650 times larger than our Sun’s, if placed in the center of our solar system the su ...
Classification and structure of galaxies
... Edwin Hubble (whom we’ll hear more about next lecture) in 1926 classified known galaxies according to shape, and suggested an “evolution” of galaxies from elliptical to spiral as they aged. The diagram was called a “tuning fork” due to its shape ...
... Edwin Hubble (whom we’ll hear more about next lecture) in 1926 classified known galaxies according to shape, and suggested an “evolution” of galaxies from elliptical to spiral as they aged. The diagram was called a “tuning fork” due to its shape ...
Active Galactic Nuclei
... Quasars are observed only at high redshifts – at large lookback times, so they existed in the distant past. There are no nearby quasars. The lower luminosity AGN’s, the Seyfert and starburst galaxies, bridge the gap between us and the more distant quasars ...
... Quasars are observed only at high redshifts – at large lookback times, so they existed in the distant past. There are no nearby quasars. The lower luminosity AGN’s, the Seyfert and starburst galaxies, bridge the gap between us and the more distant quasars ...
AS2001 - University of St Andrews
... Near centre of galaxy: Shorter orbit period--> More passes thru spiral shocks --> More star generations --> m lower --> Z higher. (Also, more infall of IGM on outskirts.) ...
... Near centre of galaxy: Shorter orbit period--> More passes thru spiral shocks --> More star generations --> m lower --> Z higher. (Also, more infall of IGM on outskirts.) ...
Lecture 7
... stars, which form in clumps of interstellar gas. (These stellar clumps tend to get pulled apart as they orbit the galaxy, so older and redder populations are smoother-looking than younger ones.) The colors and clumpiness of galaxies progress along the Hubble sequence as you would expect: red and smo ...
... stars, which form in clumps of interstellar gas. (These stellar clumps tend to get pulled apart as they orbit the galaxy, so older and redder populations are smoother-looking than younger ones.) The colors and clumpiness of galaxies progress along the Hubble sequence as you would expect: red and smo ...
5-E Galaxy T - McDonald Observatory
... Make your own Galaxy 5-E Lesson Key Introduction The Hubble Space Telescope has revealed a universe full of galaxies, and stunning detailed structures within nearby galaxies. A galaxy is a gravitationally bound system of stars, gas, and dust. They range in size from a few thousand light years to a f ...
... Make your own Galaxy 5-E Lesson Key Introduction The Hubble Space Telescope has revealed a universe full of galaxies, and stunning detailed structures within nearby galaxies. A galaxy is a gravitationally bound system of stars, gas, and dust. They range in size from a few thousand light years to a f ...
Gamma-ray burst
Gamma-ray bursts (GRBs) are flashes of gamma rays associated with extremely energetic explosions that have been observed in distant galaxies. They are the brightest electromagnetic events known to occur in the universe. Bursts can last from ten milliseconds to several hours. The initial burst is usually followed by a longer-lived ""afterglow"" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio).Most observed GRBs are believed to consist of a narrow beam of intense radiation released during a supernova or hypernova as a rapidly rotating, high-mass star collapses to form a neutron star, quark star, or black hole. A subclass of GRBs (the ""short"" bursts) appear to originate from a different process – this may be due to the merger of binary neutron stars. The cause of the precursor burst observed in some of these short events may be due to the development of a resonance between the crust and core of such stars as a result of the massive tidal forces experienced in the seconds leading up to their collision, causing the entire crust of the star to shatter.The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare (a few per galaxy per million years). All observed GRBs have originated from outside the Milky Way galaxy, although a related class of phenomena, soft gamma repeater flares, are associated with magnetars within the Milky Way. It has been hypothesized that a gamma-ray burst in the Milky Way, pointing directly towards the Earth, could cause a mass extinction event.GRBs were first detected in 1967 by the Vela satellites, a series of satellites designed to detect covert nuclear weapons tests. Hundreds of theoretical models were proposed to explain these bursts in the years following their discovery, such as collisions between comets and neutron stars. Little information was available to verify these models until the 1997 detection of the first X-ray and optical afterglows and direct measurement of their redshifts using optical spectroscopy, and thus their distances and energy outputs. These discoveries, and subsequent studies of the galaxies and supernovae associated with the bursts, clarified the distance and luminosity of GRBs. These facts definitively placed them in distant galaxies and also connected long GRBs with the explosion of massive stars, the only possible source for the energy outputs observed.