Results 61 to 70 of about 172,889 (233)

THE CHANDRA PLANETARY NEBULA SURVEY (ChanPlaNS). III. X-RAY EMISSION FROM THE CENTRAL STARS OF PLANETARY NEBULAE [PDF]

, 2014
We present X-ray spectral analysis of 20 point-like X-ray sources detected in Chandra Planetary Nebula Survey observations of 59 planetary nebulae (PNe) in the solar neighborhood.
R. Montez, J. Kastner, B. Balick, E. Behar, E. Blackman, V. Bujarrabal, You-Hua Chu, R. Corradi, O. D. Marco, Annika Frank, M. Freeman, D. Frew, M. Guerrero, David Jones, J. López, B. Miszalski, J. Nordhaus, Q. Parker, Quentin A Parker, R. Sahai, C. Sandin, D. Schönberner, N. Soker, J. Sokoloski, M. Steffen, J. A. Toal'a, T. Ueta, E. Villaver, A. Zijlstra   +28 more
semanticscholar   +1 more source

Petrography of phosphates in CI and CY carbonaceous chondrites

Meteoritics &Planetary Science, EarlyView.
Abstract Phosphate minerals are significant carriers of volatiles (e.g., OH) and halogens in chondritic material; however, their origin in most groups of carbonaceous chondrites remains poorly characterized. We have determined the abundance, morphology, texture, and composition of phosphate grains in aqueously altered CI chondrites and in hydrated and ...
C. S. Harrison, A. J. King, R. H. Jones, L. Piani   +3 more
wiley   +1 more source

First release of the IPHAS catalogue of new extended planetary nebulae [PDF]

, 2014
We present the first results of our search for new, extended planetary nebulae (PNe) based on careful, systematic, visual scrutiny of the imaging data from the Isaac Newton Telescope Photometric Hα Survey of the Northern Galactic plane (IPHAS). The newly
L. Sabin, Q. Parker, R. Corradi, L. Guzman-Ramirez, R. Morris, A. Zijlstra, I. Bojivci'c, D. Frew, M. Guerrero, M. Stupar, M. Barlow, F. C. Mora, J. Drew, R. Greimel, P. Groot, J. Irwin, M. Irwin, A. Mampaso, B. Miszalski, L. Olgu'in, S. Phillipps, M. Garc'ia, K. Viironen, N. Wright   +23 more
semanticscholar   +1 more source

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

THE CHANDRA PLANETARY NEBULA SURVEY (ChanPlaNS). II. X-RAY EMISSION FROM COMPACT PLANETARY NEBULAE [PDF]

, 2014
We present results from the most recent set of observations obtained as part of the Chandra X-ray observatory Planetary Nebula Survey (ChanPlaNS), the first comprehensive X-ray survey of planetary nebulae (PNe) in the solar neighborhood (i.e., within ∼1 ...
M. Freeman, R. Montez, J. Kastner, B. Balick, D. Frew, D. Jones, B. Miszalski, R. Sahai, E. Blackman, Y. Chu, O. D. Marco, A. Frank, M. Guerrero, J. López, A. Zijlstra, V. Bujarrabal, R. Corradi, J. Nordhaus, Q. Parker, C. Sandin, D. Schonberner, N. Soker, J. Sokoloski, M. Steffen, J. Toalá, T. Ueta, E. Science, Laboratory for Multiwavelength Astrophysics, R. I. O. Technology, D. PhysicsAstronomy, V. University, D. Astronomy, U. Washington, M. R. C. F. Astronomy, AstrophysicsAstrophotonics, Macquarie University, South African astronomical Observatory, Southern African Large Telescope Foundation, Jet propulsion Laboratory, C. I. O. Technology., D. PhysicsAstronomy, U. Rochester, U. Illinois, Inst. de Astrof'isica de Andaluc'ia, Iaa-Csic, Glorieta de la Astronom'ia sn, I. D. Astronom'ia, Universidad Autonoma de Mexico, S. O. Physics, Astronomy, U. Manchester, O. Nacional, A. Henares, Spain., Instituto de Astrof'isica de Canarias, Tenerife, D. Astrof'isica, U. L. Laguna, Nsf Astronomy, A. Fellow, Center for Computational Relativity, Gravitation, Departament de F'isica, U. Atacama, Copiap'o, Chile., E. Observatory, Santiago, Australian Astronomical Observatory, Epping, Australia Leibniz Institute for Astrophysics Potsdam, Columbia Astrophysics Laboratory, Columbia University, U. Denver, Departamento de F'isica Te'orica, U. A. D. Madrid   +75 more
semanticscholar   +1 more source

Sulfide–Metal Assemblages on CR2 Chondrule Rims: Products of Nebular Fission–Sulfidization and Parent Body Oxidation–Serpentinization

Meteoritics &Planetary Science, EarlyView.
Abstract We conducted a scanning electron microscopy (SEM) and transmission electron microscopy (TEM) study of sulfide–metal assemblages (SMAs) in minimally to moderately altered CR2 chondrites. The assemblages occur on chondrule rims and consist of kamacite cores rimmed by pyrrhotite.
S. A. Singerling, A. J. Brearley
wiley   +1 more source

SATELLITE: Application to Planetary Nebulae IFU Data

Galaxies, 2022
The integral field unit (IFU) spectroscopic view of extended ionized nebulae, such as planetary nebulae (PNe), H II regions, and galaxies, has changed the approach of studying these objects, providing a simultaneous characterization in both spatial ...
Stavros Akras, Hektor Monteiro, Jeremy R. Walsh, Isabel Aleman, Denise R. Gonçalves, Panayotis Boumis   +5 more
doaj   +1 more source

A hydrodynamical study of multiple‐shell planetary nebulae [PDF]

, 2014
We present the result of a study on the expansion properties and internal kinematics of round/elliptical planetary nebulae of the Milky Way disk, the halo, and of the globular cluster M 15.
D. Schoênberner, R. Jacob, Holger Lehmann, G. Hildebrandt, M. Steffen, A. Zwanzig, C. Sandin, R. Corradi, R. Corradi   +8 more
semanticscholar   +1 more source

The Qingzhen reaction, a fine‐grained mineral assemblage associated with djerfisherite in some EH3 chondrites: Alteration on the EH parent body

Meteoritics &Planetary Science, EarlyView.
Abstract Enstatite chondrites formed under extremely reducing conditions in the protoplanetary disk. They are derived from two or more parent bodies, EH and EL, and both EH and EL groups contain petrologic type 3–6 samples. The rare lithophile‐ and halogen‐bearing sulfide, djerfisherite, occurs in low abundance in enstatite chondrites, most frequently ...
Peter Mc Ardle, Rhian H. Jones, Luke Daly, Romain Tartèse, Patricia L. Clay, Brian O'Driscoll, Ray Burgess, William Smith, Colin How, Lewis Hughes   +9 more
wiley   +1 more source

DUSTY DISKS AROUND CENTRAL STARS OF PLANETARY NEBULAE [PDF]

, 2014
Only a few percent of cool, old white dwarfs (WDs) have infrared excesses interpreted as originating in small hot disks due to the infall and destruction of single asteroids that come within the star's Roche limit.
G. Clayton, O. De Marco, J. Nordhaus, Joel D. Green, T. Rauch, K. Werner, Y. Chu   +6 more
semanticscholar   +1 more source