Search Results - (Author, Cooperation:R. A. Chevalier)
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1Latest Papers from Table of Contents or Articles in PressJ. Larsson ; C. Fransson ; G. Ostlin ; P. Groningsson ; A. Jerkstrand ; C. Kozma ; J. Sollerman ; P. Challis ; R. P. Kirshner ; R. A. Chevalier ; K. Heng ; R. McCray ; N. B. Suntzeff ; P. Bouchet ; A. Crotts ; J. Danziger ; E. Dwek ; K. France ; P. M. Garnavich ; S. S. Lawrence ; B. Leibundgut ; P. Lundqvist ; N. Panagia ; C. S. Pun ; N. Smith ; G. Sonneborn ; L. Wang ; J. C. Wheeler
Nature Publishing Group (NPG)
Published 2011Staff ViewPublication Date: 2011-06-10Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
2Articles: DFG German National LicensesFox, D. B. ; Price, P. A. ; Ofek, E. O. ; Davis, M. R. ; Leonard, D. C. ; Soderberg, A. M. ; Schmidt, B. P. ; Lewis, K. M. ; Peterson, B. A. ; Kulkarni, S. R. ; Berger, E. ; Cenko, S. B. ; Sari, R. ; Sharon, K. ; Frail, D. ; Moon, D.-S. ; Brown, P. J. ; Cucchiara, A. ; Harrison, F. ; Piran, T. ; Persson, S. E. ; McCarthy, P. J. ; Penprase, B. E. ; Chevalier, R. A. ; MacFadyen, A. I.
[s.l.] : Nature Publishing Group
Published 2006Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Over the past decade, our physical understanding of γ-ray bursts (GRBs) has progressed rapidly, thanks to the discovery and observation of their long-lived afterglow emission. Long-duration (≳2 s) GRBs are associated with the explosive deaths of massive stars ...Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesPrice, P. A. ; Kulkarni, S. R. ; Berger, E. ; Piran, T. ; Soderberg, A. M. ; Cenko, S. B. ; Cameron, P. B. ; Gal-Yam, A. ; Kasliwal, M. M. ; Moon, D.-S. ; Harrison, F. A. ; Nakar, E. ; Schmidt, B. P. ; Penprase, B. ; Chevalier, R. A. ; Kumar, P. ; Roth, K. ; Watson, D. ; Lee, B. L. ; Shectman, S. ; Phillips, M. M. ; Roth, M. ; McCarthy, P. J. ; Rauch, M. ; Cowie, L.
[s.l.] : Nature Publishing Group
Published 2005Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The final chapter in the long-standing mystery of the γ-ray bursts (GRBs) centres on the origin of the short-hard class of bursts, which are suspected on theoretical grounds to result from the coalescence of neutron-star or black-hole binary systems. Numerous searches for the afterglows of ...Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesKulkarni, S. R. ; Nakar, E. ; Berger, E. ; Cameron, P. B. ; Fox, D. B. ; Frail, D. ; Gal-Yam, A. ; Sari, R. ; Cenko, S. B. ; Kasliwal, M. ; Chevalier, R. A. ; Piran, T. ; Price, P. A. ; Schmidt, B. P. ; Pooley, G. ; Moon, D.-S. ; Penprase, B. E. ; Ofek, E. ; Rau, A. ; Gehrels, N. ; Nousek, J. A. ; Burrows, D. N. ; Persson, S. E. ; McCarthy, P. J. ; Soderberg, A. M.
[s.l.] : Nature Publishing Group
Published 2006Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Over the past decade, long-duration γ-ray bursts (GRBs)—including the subclass of X-ray flashes (XRFs)—have been revealed to be a rare variety of type Ibc supernova. Although all these events result from the death of massive stars, the electromagnetic luminosities of GRBs and ...Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 1749-6632Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: Natural Sciences in GeneralType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1572-946XKeywords: Hydrodynamics ; Planetary Nebulae ; SN 1987ASource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The interacting winds model, in which the fast wind from a central hot star sweeps up a shell in a surrounding slow, dense wind, has been extensively applied to planetary nebulae and to the nebula around SN 1987A. If the wind properties are approximately constant over a period of time, the flow becomes self-similar. The additional assumption of a constant interior pressure allows the use of the thin shell approximation for the case of an axisymmetric slow wind density distribution. Calculations of this type show the importance of the velocity of the slow wind to the nebular shape. The thin shell approximation can also be used in the case of an axisymmetric magnetic field in the shocked fast wind; the aspherical shape is then determined by the magnetic field of the central, rotating star. Photoionization by the central star can cause the swept-up shell to become geometrically thick. There is evidence that this occurred in the SN 1987A nebula and that the shock wave interaction with the thick shell produces the observed X-ray and radio emission from the nebula. The combination of photoionization and substantial density asymmetry can result in a flow of the ionized gas away from the equator. The flow can produce a quadrupolar symmetry in the nebular shape.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 1572-946XSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract We suggest that sharp velocity gradients will exist in fluid-like turbulence in nearly collisionless plasma. This implies effective quenching of Fermi acceleration of thermal particles, but the Fermi acceleration coefficient for relativistic particles remains essentially unchanged.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1573-093XSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The excitation of the lowest (3s23p2) configuration of Fexiii is discussed for the range of density and temperatures experienced in the solar corona. The principal features are the introduction of proton collisions as an important mechanism for exciting the 3p2 3P levels, the use of improved electron collision strengths and a detailed discussion of the influence of the excited configurations. The predicted intensity ratios are shown to be consistent with available observations with the single exception of an eclipse measurement of the ratio of the intensities of the infrared lines.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Chevalier and Fransson7 discussed the early observations of supernova 1987A related to circumstellar interaction. They showed that the early radio observations and lack of detectable X-ray emission were consistent with shock interaction with a blue supergiant wind and predicted that radiative ...Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] We assume that the wind is spherically symmetrical and that gravitational forces are negligible. The total mass and energy input are M and ‰ respectively. The equations for the flow are3: du dP - =---qu dt dr (1) (2) where for r 〈 R, q = M/ V9 Q = ‰/ V, V = | tt3, and for r〉 R, q- ...Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The evolution of the helium core of a massive star should, in the later stages, be decoupled from the envelope structure of the star. One expects, therefore, that the explosion of SN1987A was very similar, except in aspects related directly to the radius of its hydrogen envelope, to a typical type ...Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The bright type II supernovae SN1979c and SN1980k were observed at a range of wavelengths from radio to X-ray wavelengths. Many of the observations can be interpreted in terms of a model involving the interaction of the supernova with a dense circumstellar medium4'6. The radio emission is ...Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1573-093XSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The excitation of the 2s22p2 ground configuration of Caxv is calculated for coronal densities and temperatures. The calculations include electron and proton excitation of the forbidden transitions and electron excitation via the first excited (2s2p3) configuration. It is shown that measurements of the line intensity ratio I(λ 5694)/I(λ 5446) are in good agreement with the predictions. The line to continuum observations for limb flares and coronal condensations are discussed. It is suggested that the calcium abundance in condensations is enhanced owing to diffusion processes.Type of Medium: Electronic ResourceURL: