April 2017 - Newbury Astronomical Society
... Dwarf companion. Hydrogen is pulled off the red giant and spirals inwards towards the white dwarf and forms a rotating disc. The Hydrogen gas eventually falls on to the surface of the white dwarf and is compressed by the enormous gravity into a shallow but very dense layer on the surface. The size o ...
... Dwarf companion. Hydrogen is pulled off the red giant and spirals inwards towards the white dwarf and forms a rotating disc. The Hydrogen gas eventually falls on to the surface of the white dwarf and is compressed by the enormous gravity into a shallow but very dense layer on the surface. The size o ...
The Stellar Population And Origin Of The Mysterious K.V. Getman
... The mysterious high galactic latitude cometary globule (CG) CG12 has been observed with the ACIS detector on board the Chandra X-ray Observatory. We detect 128 X-ray sources, of which a half are likely young stars formed within the globule's head. This new population of >=50 T-Tauri stars and one ne ...
... The mysterious high galactic latitude cometary globule (CG) CG12 has been observed with the ACIS detector on board the Chandra X-ray Observatory. We detect 128 X-ray sources, of which a half are likely young stars formed within the globule's head. This new population of >=50 T-Tauri stars and one ne ...
A scenario of planet erosion by coronal radiation*
... dependence of the erosion line on mass, combined with the mass distribution observed in Fig. 2, confirms that FX is the main variable, with few massive planets surviving exposure to high radiation as discussed below. The distribution of density with mass displayed in Fig. 3 is also consistent with t ...
... dependence of the erosion line on mass, combined with the mass distribution observed in Fig. 2, confirms that FX is the main variable, with few massive planets surviving exposure to high radiation as discussed below. The distribution of density with mass displayed in Fig. 3 is also consistent with t ...
Slide 1
... “If it were a star, then the immutable heavens had changed, and the basic contrast between the superlunary region and the corruptible earth was in question. If it were a star, the earth might more easily be conceived as a planet, for the transitory character of terrestrial affairs would now have be ...
... “If it were a star, then the immutable heavens had changed, and the basic contrast between the superlunary region and the corruptible earth was in question. If it were a star, the earth might more easily be conceived as a planet, for the transitory character of terrestrial affairs would now have be ...
Dark matter in the Galactic Halo Rotation curve (i.e. the orbital
... 21 cm emission from hydrogen • for the outer Galaxy by looking at the velocity of star clusters relative to the Sun. (details of these methods are given in Section 2.3 of Sparke & Gallagher…) ...
... 21 cm emission from hydrogen • for the outer Galaxy by looking at the velocity of star clusters relative to the Sun. (details of these methods are given in Section 2.3 of Sparke & Gallagher…) ...
PHYS3380_111615_bw - The University of Texas at Dallas
... Fingers, loops, and bays indicate that magnetic field of the nebula and filaments of cooler matter are controlling the motion of the electrons and positrons. The particles can move rapidly along the magnetic field and travel several light years before radiating away their energy - move much more slo ...
... Fingers, loops, and bays indicate that magnetic field of the nebula and filaments of cooler matter are controlling the motion of the electrons and positrons. The particles can move rapidly along the magnetic field and travel several light years before radiating away their energy - move much more slo ...
The Milky Way Galaxy
... discovered that the brighter Cepheid variable stars in the Large Magellanic Cloud had longer periods than the Cepheids with shorter periods. This is the famous period-luminosity ...
... discovered that the brighter Cepheid variable stars in the Large Magellanic Cloud had longer periods than the Cepheids with shorter periods. This is the famous period-luminosity ...
Superconducting Detectors: Sensitivity Over Ten Orders of Magnitude
... Is a particular nation violating nuclear treaties? Can we account for all of their plutonium? Do we know what it is being used for? Gamma-ray spectroscopy What is this defect in my semiconductor wafer? How can I fix it? Soft x-ray spectroscopy (now commercial!) Do we understand the electron structur ...
... Is a particular nation violating nuclear treaties? Can we account for all of their plutonium? Do we know what it is being used for? Gamma-ray spectroscopy What is this defect in my semiconductor wafer? How can I fix it? Soft x-ray spectroscopy (now commercial!) Do we understand the electron structur ...
Section 14
... lead to fusion processes within it. The onset of these fusion processes, though, is very swift--the whole thing violently explodes. This is called a "nova" in the textbook but is more properly called a "Type I Supernova". The explosion causes the white dwarf to briefly shine about as brightly as any ...
... lead to fusion processes within it. The onset of these fusion processes, though, is very swift--the whole thing violently explodes. This is called a "nova" in the textbook but is more properly called a "Type I Supernova". The explosion causes the white dwarf to briefly shine about as brightly as any ...
White dwarf with almost pure oxygen atmosphere
... Image of Sirius A and Sirius B taken by the Hubble Space Telescope. Sirius B, which is a white dwarf, can be seen as a faint pinprick of light to the lower left of the much brighter Sirius A. Image: NASA, ESA ...
... Image of Sirius A and Sirius B taken by the Hubble Space Telescope. Sirius B, which is a white dwarf, can be seen as a faint pinprick of light to the lower left of the much brighter Sirius A. Image: NASA, ESA ...
Black Holes
... a) NASA’s latest X-ray orbiting telescope. b) a millisecond pulsar with three planets. c) the strongest X-ray eclipsing binary system. d) a likely black hole binary star system. e) the first gamma-ray burster spotted in X rays. ...
... a) NASA’s latest X-ray orbiting telescope. b) a millisecond pulsar with three planets. c) the strongest X-ray eclipsing binary system. d) a likely black hole binary star system. e) the first gamma-ray burster spotted in X rays. ...
Astronomy 112: The Physics of Stars Class 18 Notes: Neutron Stars
... a typical refrigerator magnet is around 100 gauss, the strongest magnets we can make on Earth are well under 106 gauss, and the strongest magnetic field ever achieved briefly (using focused explosives) are around 107 gauss. Even a 106 gauss field cannot be created using conventional materials becaus ...
... a typical refrigerator magnet is around 100 gauss, the strongest magnets we can make on Earth are well under 106 gauss, and the strongest magnetic field ever achieved briefly (using focused explosives) are around 107 gauss. Even a 106 gauss field cannot be created using conventional materials becaus ...
Document
... neutronization of stellar matter Mostly electron neutrinos νe of individual energy: • 15-20 MeV for spherically-symmetrical collapse • 30-40 MeV for rotational-fission model is necessary to interpret the statistically significant signal from SN 1987A registered by the LSD neutrino detector Character ...
... neutronization of stellar matter Mostly electron neutrinos νe of individual energy: • 15-20 MeV for spherically-symmetrical collapse • 30-40 MeV for rotational-fission model is necessary to interpret the statistically significant signal from SN 1987A registered by the LSD neutrino detector Character ...
Turning AGN Microlensing From a Curiosity Into a Tool
... •Uncorrelated variations due to “microlensing” by the stars in the lens galaxy (For non-astronomers, magnitudes are –2.5log(flux)+constant) ...
... •Uncorrelated variations due to “microlensing” by the stars in the lens galaxy (For non-astronomers, magnitudes are –2.5log(flux)+constant) ...
copyright 2002 scientific american, inc.
... because it occurred on May 8, 1997. Radio observations of its afterglow provided an essential clue. The glow varied erratically by roughly a factor of two during the first three weeks, after which it stabilized and then began to diminish. The large variations probably had nothing to do with the burs ...
... because it occurred on May 8, 1997. Radio observations of its afterglow provided an essential clue. The glow varied erratically by roughly a factor of two during the first three weeks, after which it stabilized and then began to diminish. The large variations probably had nothing to do with the burs ...
Galaxy3
... many orders of magnitude to large to be bound by the cluster. This means that either, the galaxy clusters everywhere in the universe are flying apart, or else there is a huge amount of dark matter present. ...
... many orders of magnitude to large to be bound by the cluster. This means that either, the galaxy clusters everywhere in the universe are flying apart, or else there is a huge amount of dark matter present. ...
L171 COULD BLACK HOLE X-RAY BINARIES BE DETECTED IN
... XRB as an X-ray source (during an outburst) in a GC is vanishing. Even if we adopted an optimistic average value of tMT /tex p 0.1 for all Galactic GCs, the overall duty cycle DC p fXtMT /tex ! 10⫺3 would be compatible with the absence of any detection in the ∼100 Galactic GCs. In contrast to post-e ...
... XRB as an X-ray source (during an outburst) in a GC is vanishing. Even if we adopted an optimistic average value of tMT /tex p 0.1 for all Galactic GCs, the overall duty cycle DC p fXtMT /tex ! 10⫺3 would be compatible with the absence of any detection in the ∼100 Galactic GCs. In contrast to post-e ...
If neutron star is born with a strong magnetic field
... If magnetic field is generated in neutron star after it is born • Blandford et al (1983) developed a suggestion of Urpin & Yakovlev (1980) that the strong heat fluxes in the crust of a young rotating neutron star lead to a possible thermoelectric instability in the solid crust which causes horizont ...
... If magnetic field is generated in neutron star after it is born • Blandford et al (1983) developed a suggestion of Urpin & Yakovlev (1980) that the strong heat fluxes in the crust of a young rotating neutron star lead to a possible thermoelectric instability in the solid crust which causes horizont ...
Nature template - PC Word 97
... from 2005.819 to 2005.831 during the first X-ray flare implies that acceleration of subTeV-energy electrons was particularly efficient at this time. These same electrons both produce X-rays from synchrotron radiation and scatter the X-ray photons to GeV -ray energies that are boosted to the TeV ran ...
... from 2005.819 to 2005.831 during the first X-ray flare implies that acceleration of subTeV-energy electrons was particularly efficient at this time. These same electrons both produce X-rays from synchrotron radiation and scatter the X-ray photons to GeV -ray energies that are boosted to the TeV ran ...
Life Cycle of Stars
... 6. Guide students through the series of steps on the Life Cycle of Stars Information Chart (at the end of the lesson). For each age, tell students what to do for their color of balloon. To help students follow the progression, you might write different ages on a board or overhead as you move on, and ...
... 6. Guide students through the series of steps on the Life Cycle of Stars Information Chart (at the end of the lesson). For each age, tell students what to do for their color of balloon. To help students follow the progression, you might write different ages on a board or overhead as you move on, and ...
Structure of Neutron Stars
... • 1105.1525 Mass and radius estimation for the neutron star in X-ray burster 4U 1820-30 • 1105.2030 New Method for Determining the Mass and Radius of Neutron Stars • 1106.3131 Constraints on the Mass and Radius of the Neutron Star XTE J1807-294 • 1111.0347 Constraints on neutron star mass and radius ...
... • 1105.1525 Mass and radius estimation for the neutron star in X-ray burster 4U 1820-30 • 1105.2030 New Method for Determining the Mass and Radius of Neutron Stars • 1106.3131 Constraints on the Mass and Radius of the Neutron Star XTE J1807-294 • 1111.0347 Constraints on neutron star mass and radius ...
ECLIPSE, Volume 1, Number 3, March - April 2017
... in 2008 after his Ph.D., when the facility was just in its second year of operations. It was a half-hour trek from the living quarters to the telescope, where Vanderlinde and a colleague checked in to make sure the telescope was staying healthy. Overall the work went well, except for occasional mech ...
... in 2008 after his Ph.D., when the facility was just in its second year of operations. It was a half-hour trek from the living quarters to the telescope, where Vanderlinde and a colleague checked in to make sure the telescope was staying healthy. Overall the work went well, except for occasional mech ...
Black Hole Accretion
... and NS radii (1.6 -- 4 Schw. radii, i.e., 6.5 -- 16 km), for three choices of the core temperature ...
... and NS radii (1.6 -- 4 Schw. radii, i.e., 6.5 -- 16 km), for three choices of the core temperature ...
Stars off the Main Sequence - ScienceEducationatNewPaltz
... Evidence: precisely repeated radio pulses Attributed to rotating neutron stars which emit lighthouse type sweeping beams as they rotate ...
... Evidence: precisely repeated radio pulses Attributed to rotating neutron stars which emit lighthouse type sweeping beams as they rotate ...
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.