STARS
... • Leftover core has between 1.4 – 3 solar masses • Collapses so much that protons and electrons combine to form neutrons • Very dense (a thimbleful weights more than 100 million tons) • Emit radio waves (pulsars) ...
... • Leftover core has between 1.4 – 3 solar masses • Collapses so much that protons and electrons combine to form neutrons • Very dense (a thimbleful weights more than 100 million tons) • Emit radio waves (pulsars) ...
The Hidden Lives of Galaxies NSTA 2001
... Black holes are often part of a binary star system - two stars revolving around each other. What we see from Earth is a visible star orbiting around what appears to be nothing. We can infer the mass of the black hole by the way the visible star is orbiting around ...
... Black holes are often part of a binary star system - two stars revolving around each other. What we see from Earth is a visible star orbiting around what appears to be nothing. We can infer the mass of the black hole by the way the visible star is orbiting around ...
Lecture 2. Thermal evolution and surface emission of
... relatively long spin periods (few tenths of a second). These NSs are relatively hot, and probably not very rare. Surprisingly, we do not see objects of this type in our vicinity. In the solar neighbourhood we meet a different class of object. ...
... relatively long spin periods (few tenths of a second). These NSs are relatively hot, and probably not very rare. Surprisingly, we do not see objects of this type in our vicinity. In the solar neighbourhood we meet a different class of object. ...
New ultra faint dwarf galaxy candidates discovered with the Dark
... The extra mass is assumed to be in the form of a substance called 'Dark Matter' (distinct from Dark Energy). This substance has been puzzling astronomers and physicists for 80 years now, and its nature is still unknown. **The ultimate nature of Dark Matter is a KEY UNSOLVED PROBLEM in basic physics ...
... The extra mass is assumed to be in the form of a substance called 'Dark Matter' (distinct from Dark Energy). This substance has been puzzling astronomers and physicists for 80 years now, and its nature is still unknown. **The ultimate nature of Dark Matter is a KEY UNSOLVED PROBLEM in basic physics ...
DTU_9e_ch13
... becomes a giant when hydrogen shell fusion begins. It becomes a horizontal-branch star when core helium fusion begins. It enters the asymptotic giant branch and becomes a supergiant when helium shell fusion starts. Stellar winds during the thermal pulse phase eject mass from the star’s outer layers. ...
... becomes a giant when hydrogen shell fusion begins. It becomes a horizontal-branch star when core helium fusion begins. It enters the asymptotic giant branch and becomes a supergiant when helium shell fusion starts. Stellar winds during the thermal pulse phase eject mass from the star’s outer layers. ...
ISOLATED, MASSIVE SUPERGIANTS NEAR THE GALACTIC
... with the radio H ii region H2 and a newly identified star that we refer to as CXOGC J174516.1290315. The infrared spectra of both stars exhibit very strong Br and He i lines and resemble those of massive supergiants that have evolved off of the main sequence but not yet reached the Wolf-Rayet phas ...
... with the radio H ii region H2 and a newly identified star that we refer to as CXOGC J174516.1290315. The infrared spectra of both stars exhibit very strong Br and He i lines and resemble those of massive supergiants that have evolved off of the main sequence but not yet reached the Wolf-Rayet phas ...
www.astro.caltech.edu
... interpret this discovery. Most models relied on explosions on the surfaces of compact stars such as white dwarfs within (or in the halo of) our Milky Way Galaxy. A major breakthrough came in February 1997, when for the first time optical and X-ray emission was detected from an gamma-ray burst. When ...
... interpret this discovery. Most models relied on explosions on the surfaces of compact stars such as white dwarfs within (or in the halo of) our Milky Way Galaxy. A major breakthrough came in February 1997, when for the first time optical and X-ray emission was detected from an gamma-ray burst. When ...
1. The distances to the most remote galaxies can be
... a) have all their stars on the main sequence. b) Have only their high mass stars on the main sequence while the low-mass protostars are still contracting (and hence are not on the main sequence yet). c) Have only their low mass stars on the main sequence while the high-mass protostars are still cont ...
... a) have all their stars on the main sequence. b) Have only their high mass stars on the main sequence while the low-mass protostars are still contracting (and hence are not on the main sequence yet). c) Have only their low mass stars on the main sequence while the high-mass protostars are still cont ...
Sirius Astronomer - Orange County Astronomers
... HST has also found evidence for a cluster of young blue stars encircling one of the 1 st intermediate-mass black holes ever discovered. Small black holes (formed from a star collapsing) and supermassive black holes (found at the centers of most large galaxies) are both common. But intermediate-mass ...
... HST has also found evidence for a cluster of young blue stars encircling one of the 1 st intermediate-mass black holes ever discovered. Small black holes (formed from a star collapsing) and supermassive black holes (found at the centers of most large galaxies) are both common. But intermediate-mass ...
The correct answers are written in bold, italic and underlined. The
... Cosmic rays are made up primarily of atomic nuclei that travel through space after being accelerated to very high speeds and energies, often by processes associated with supernovae. 5. What is believed to be the origin of most of the cosmic rays arriving at the Earth from outside the solar system? • ...
... Cosmic rays are made up primarily of atomic nuclei that travel through space after being accelerated to very high speeds and energies, often by processes associated with supernovae. 5. What is believed to be the origin of most of the cosmic rays arriving at the Earth from outside the solar system? • ...
Chapter 13 The Stellar Graveyard
... By following the fate of a tiny proton whipping about at near light speed close to the neutron star with NASA's Rossi X-ray Explorer satellite, scientists calculated this star's magnetic field to be up to 10 times more powerful than previously thought -- with a force strong enough to slow a steel lo ...
... By following the fate of a tiny proton whipping about at near light speed close to the neutron star with NASA's Rossi X-ray Explorer satellite, scientists calculated this star's magnetic field to be up to 10 times more powerful than previously thought -- with a force strong enough to slow a steel lo ...
Characteristics of Stars PLATO
... • As the star runs out of fuel, it will grow larger and cooler and become a Red Giant. (Cool, dim) –Huge stars with lots of fuel can become a Supergiant – It is like taking the wood from a burning campfire and spreading it out across the beach. It gets cooler and dim, but takes up more space. ...
... • As the star runs out of fuel, it will grow larger and cooler and become a Red Giant. (Cool, dim) –Huge stars with lots of fuel can become a Supergiant – It is like taking the wood from a burning campfire and spreading it out across the beach. It gets cooler and dim, but takes up more space. ...
AY5 Homework for Quiz 3: Spring 2015
... center of the Galaxy) requires much more mass in the galaxy than can be accounted for in identified stars and gas. The best model is for a dark matter “halo”. ...
... center of the Galaxy) requires much more mass in the galaxy than can be accounted for in identified stars and gas. The best model is for a dark matter “halo”. ...
Chapter 15: The Deaths of Massive Stars
... 2. The mass of a black hole can be measured using Kepler’s third law. The electric charge of a black hole can also be measured, but is not considered in discussing black holes since they quickly become neutral through accretion. 3. Black holes are thought to spin very rapidly. A spinning black hole ...
... 2. The mass of a black hole can be measured using Kepler’s third law. The electric charge of a black hole can also be measured, but is not considered in discussing black holes since they quickly become neutral through accretion. 3. Black holes are thought to spin very rapidly. A spinning black hole ...
sc_examII_spring_2002 - University of Maryland Astronomy
... B. using its distance from the Sun and its rotational period. C. using its angular size and distance from Earth. D. using data from spacecraft flybys. E. by measuring the time that it takes for the Red Spot to disappear from view. 7. The gas tail of a comet develops when A. part of the nucleus drift ...
... B. using its distance from the Sun and its rotational period. C. using its angular size and distance from Earth. D. using data from spacecraft flybys. E. by measuring the time that it takes for the Red Spot to disappear from view. 7. The gas tail of a comet develops when A. part of the nucleus drift ...
Ch 20-21 Review
... 20) What produces a type-I supernova? A) the collapse of the core of a massive star B) the helium flash blows apart a giant's core C) mass transfer onto a white dwarf pushing it over 1.4 solar masses D) a nova igniting a helium flash in its red giant companion E) the radioactive decay of nickel 56 i ...
... 20) What produces a type-I supernova? A) the collapse of the core of a massive star B) the helium flash blows apart a giant's core C) mass transfer onto a white dwarf pushing it over 1.4 solar masses D) a nova igniting a helium flash in its red giant companion E) the radioactive decay of nickel 56 i ...
Open clusters
... Review from last time: from observations of nearby stars, we can determine: distance to star apparent brightness luminosity spectral type temperature (for binary systems: mass) radius ...
... Review from last time: from observations of nearby stars, we can determine: distance to star apparent brightness luminosity spectral type temperature (for binary systems: mass) radius ...
High Energy Phenomena in Supergiant X-ray Binaries - HAL-Insu
... and 200s binned lightcurve (Zurita Heras & Chaty in prep.). The compact object is probably a NS (in’t Zand 2005). Pellizza et al. (2006) managed to get optical/NIR ToO observations only one day after the discovery of this source. They identified a likely counterpart inside the XMM-Newton error circl ...
... and 200s binned lightcurve (Zurita Heras & Chaty in prep.). The compact object is probably a NS (in’t Zand 2005). Pellizza et al. (2006) managed to get optical/NIR ToO observations only one day after the discovery of this source. They identified a likely counterpart inside the XMM-Newton error circl ...
N-Body Simulations of Star Clusters with IMBH
... Disruption of Stars by the IMBH Most stars disrupted by the IMBH are main-sequence stars and giants. Disruption of neutron stars are rare. During the simulations, no black holes merged with the IMBH. Stars disrupted by the IMBH move on very elongated orbits, so the fate of the ...
... Disruption of Stars by the IMBH Most stars disrupted by the IMBH are main-sequence stars and giants. Disruption of neutron stars are rare. During the simulations, no black holes merged with the IMBH. Stars disrupted by the IMBH move on very elongated orbits, so the fate of the ...
DTU9ePPTChap13 - Faculty Lounge : Astronomy
... becomes a giant when hydrogen shell fusion begins. It becomes a horizontal-branch star when core helium fusion begins. It enters the asymptotic giant branch and becomes a supergiant when helium shell fusion starts. Stellar winds during the thermal pulse phase eject mass from the star’s outer layers. ...
... becomes a giant when hydrogen shell fusion begins. It becomes a horizontal-branch star when core helium fusion begins. It enters the asymptotic giant branch and becomes a supergiant when helium shell fusion starts. Stellar winds during the thermal pulse phase eject mass from the star’s outer layers. ...
PPT 15MB - HubbleSOURCE
... image, however, about 0.4 degrees across in panel “b”) The Paschen series of hydrogen spectral lines in the infrared is named after the German physicist Louis Paschen, who discovered them in 1908 (the alpha line, at 1.87 microns, is the strongest of the series). The Earth’s atmosphere absorbs this ...
... image, however, about 0.4 degrees across in panel “b”) The Paschen series of hydrogen spectral lines in the infrared is named after the German physicist Louis Paschen, who discovered them in 1908 (the alpha line, at 1.87 microns, is the strongest of the series). The Earth’s atmosphere absorbs this ...
Identification of the optical counterparts of high-mass X
... In HMXBs, X/γ-rays are produced as the result of accretion of matter onto the neutron star. The way how matter is transferred from the massive star differs in each case. Among HMXBs with evolved companions there are disk-fed and windfed systems depending upon whether accreted matter is transferred t ...
... In HMXBs, X/γ-rays are produced as the result of accretion of matter onto the neutron star. The way how matter is transferred from the massive star differs in each case. Among HMXBs with evolved companions there are disk-fed and windfed systems depending upon whether accreted matter is transferred t ...
Space - lucu
... sites of star formation. In fact, all stars, planets, and solar systems are formed from nebulae. • A nebula may lie undisturbed for many millions or billions of years as it waits for just the right conditions to form stars. ...
... sites of star formation. In fact, all stars, planets, and solar systems are formed from nebulae. • A nebula may lie undisturbed for many millions or billions of years as it waits for just the right conditions to form stars. ...
Astrophysical X-ray source
Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays.There are a number of types of astrophysical objects which emit X-rays, from galaxy clusters, through black holes in active galactic nuclei (AGN) to galactic objects such as supernova remnants, stars, and binary stars containing a white dwarf (cataclysmic variable stars and super soft X-ray sources), neutron star or black hole (X-ray binaries). Some solar system bodies emit X-rays, the most notable being the Moon, although most of the X-ray brightness of the Moon arises from reflected solar X-rays. A combination of many unresolved X-ray sources is thought to produce the observed X-ray background. The X-ray continuum can arise from bremsstrahlung, either magnetic or ordinary Coulomb, black-body radiation, synchrotron radiation, inverse Compton scattering of lower-energy photons be relativistic electrons, knock-on collisions of fast protons with atomic electrons, and atomic recombination, with or without additional electron transitions.Furthermore, celestial entities in space are discussed as celestial X-ray sources. The origin of all observed astronomical X-ray sources is in, near to, or associated with a coronal cloud or gas at coronal cloud temperatures for however long or brief a period.