Results 51 to 60 of about 221,035 (206)

Stochastic processes, galactic star formation, and chemical evolution. Effects of accretion, stripping, and collisions in multiphase multi-zone models [PDF]

, 2005
This paper reports simulations allowing for stochastic accretion and mass loss within closed and open systems modeled using a previously developed multi-population, multi-zone (halo, thick disk, thin disk) treatment.
Casuso, Chiappini, Cignoni, Comins, Copi, Copi, D. Galli, de Mello, Feldman, Ferrini, Ferrini, Franco, G. Valle, Galli, Gerola, Grevesse, Hellsten, Hébard, Kroupa, Lejeune, Lubowich, Lynden-Bell, Matteucci, Pardi, Quilis, S. N. Shore, Schulman, Shore, Shore, Shore, Tinsley, Travaglio, Valle, Vidal-Madjar, Vollmer, Vollmer   +35 more
core   +2 more sources

Thick disk and pseudobulge formation in a clump cluster

EPJ Web of Conferences, 2012
Bulges in spiral galaxies have been supposed to be classified into two types: classical bulges or pseudobulges. Classical bulges are thought to form by galactic merger with bursty star formation, whereas pseudobulges are suggested to form by secular ...
Inoue S.
doaj   +1 more source

Spitzer observations of NGC2264: The nature of the disk population

, 2012
NGC2264 is a young cluster with a rich circumstellar disk population which makes it an ideal target for studying the evolution of stellar clusters.
Alencar, Alexander, Alexander, Alexander, Alves, Baraffe, Baxter, Bertin, Butler, C. J. Lada, Calvet, Calvet, Calvet, Cardelli, Cieza, Cieza, Cieza, Currie, Currie, Dahm, Dickman, Dullemond, E. A. Lada, Fazio, Fazio, Flaccomio, Flaherty, Fűrész, Fűrész, Greene, Gräfe, Hawley, Hernández, Hernández, Ireland, Johnstone, Jørgensen, Kleinmann, Kroupa, Kwon, Lada, Lada, Lada, Lada, Lada, Levine, Luhman, M. Marengo, Margulis, Margulis, Merín, Meyer, Muench, Muzerolle, Najita, Noriega-Crespo, P. S. Teixeira, Peretto, Peretto, Piche, Rebull, Reipurth, Riaz, Ridge, Rieke, Robitaille, Román-Zúñiga, Sicilia-Aguilar, Skrutskie, Sung, Sung, Tanaka, Teixeira, Teixeira, Teixeira, Walker, Werner, White, Winston, Wood, Young   +80 more
core   +1 more source

Non-LTE Sodium Abundance in Galactic Thick- and Thin-Disk Red Giants

, 2014
We evaluate non-local thermodynamical equilibrium (non-LTE) line formation for neutral sodium in model atmospheres of the 79 red giants using the model atom that incorporates the best available atomic data.
Alexeeva, S. A., Mashonkina, L. I., Pakhomov, Yu. V.   +2 more
core   +1 more source

The thick disk rotation-metallicity correlation as a fossil of an "inverse chemical gradient" in the early Galaxy

, 2012
The thick disk rotation--metallicity correlation, \partial V_\phi/\partial[Fe/H] =40\div 50 km s^{-1}dex^{-1} represents an important signature of the formation processes of the galactic disk.
A. Curir, A. Spagna, Abadi, Abazajian, Allen de Prieto, Arnadottir, Bond, Bournaud, Brook, Cescutti, Chiappini, Chiappini, Chiappini, Cresci, Curir, E. Spitoni, F. Matteucci, Freeman, Freeman, Friedli, G. Murante, Gratton, Haywood, Hernquist, Ivezić, Jenkins, Kordopatis, Lasker, Lee, Loebman, Luck, M. G. Lattanzi, Matteucci, Minchev, Morrison, Navarro, P. Re Fiorentin, Qu, Quinn, Robin, Roškar, Schönrich, Schönrich, Sellwood, Spagna, Spitoni, Springel, Villalobos, Wielen, Yanny   +49 more
core   +1 more source

Elemental Abundance Survey of The Galactic Thick Disk

, 2005
[Abridged abstract] We have performed an abundance analysis for 176 F- and G- dwarfs of the Galactic thick disk component. Using accurate radial velocities combined with $Hipparcos$ astrometry, kinematics (U, V, and W) and Galactic orbital parameters ...
Lambert, David L., Prieto, Carlos Allende, Reddy, Bacham E.   +2 more
core   +2 more sources

Oxygen Abundances in Nearby Stars. Clues to the formation and evolution of the Galactic disk [PDF]

, 2006
The abundances of iron and oxygen are homogeneously determined in a sample of 523 nearby ...
Abadi, Allende Prieto, Allende Prieto, Allende Prieto, Allende Prieto, Allende Prieto, Allende Prieto, Allende Prieto, Allende Prieto, Anstee, Aparicio, Asplund, Asplund, Asplund, Bagnulo, Barbier-Brossat, Barklem, Barklem, Beers, Bensby, Bensby, Bensby, Bertelli, Biémont, Blackwell, Brook, Brook, Butler, C. Allende Prieto, Cabrera-Lavers, Casagrande, Castelli, Chen, Chiappini, Chiba, Clayton, Cowley, D. L. Lambert, Dalcanton, Dehnen, Demircan, Drawin, Duflot, Eriksson, Feltzing, Feltzing, Freeman, Fry, Fuhrmann, Gehren, Gilmore, Gilmore, Gratton, Gratton, Gray, Greggio, Heiter, Hibbert, Holweger, Hubeny, Hubeny, I. Ramírez, Iben, Johnson, Jørgensen, Kim, Kiselman, Kiselman, Kobayashi, Korn, Krauss, Lallement, Lambert, Larsen, Latham, Leroy, Maeder, Majewski, Masana, McWilliam, Meléndez, Meléndez, Mermilliod, Mishenina, Morel, Nissen, Nomoto, Nordström, Ojha, Pont, Prochaska, Quinn, Ramírez, Ramírez, Ramírez, Ramírez, Rana, Reddy, Reddy, Reid, Reylé, Robin, Salaris, Salpeter, Santos, Santos, Schild, Schuler, Schwarzkopf, Shchukina, Shchukina, Siegel, Soubiran, Soubiran, Soubiran, Steenbock, Takeda, Thévenin, Tinsley, Tull, Valenti, Wheeler, Wyse, Yoachim, Yoachim, Yong   +125 more
core   +2 more sources

On the Stellar Disk Vertical Scale Height of Edge-on Galaxies from S4G

The Astrophysical Journal
Disk galaxies viewed as thin planar structures resulting from the conservation of angular momentum of an initially rotating pregalactic cloud allow merely a first-order model of galaxy formation, but the presence of vertically extended structures has ...
Notahiana Ranaivoharimina, T. Randriamampandry, Jing Wang, K. Menéndez-Delmestre, T. S. Gonçalves   +4 more
doaj   +1 more source

Modelling the Galactic distribution of free electrons

, 2012
In this paper we test 8 models of the free electron distribution in the Milky Way that have been published previously, and we introduce 4 additional models that explore the parameter space of possible models further.
Berkhuijsen, Berkhuijsen, Brown, Cordes, D. H. F. M. Schnitzeler, Dennison, Dickinson, Feigelson, Finkbeiner, Freire, Gaensler, Gaustad, Georgelin, Ghosh, Gómez, Gómez, Haffner, Haffner, Han, Harris, Jansson, Law, Lyne, Madsen, Manchester, Men, Mitra, Nota, Noutsos, Peek, Reynolds, Rowles, Roy, Savage, Schlegel, Snowden, Sun, Taylor, Valls-Gabaud, Vallée, Verbiest   +40 more
core   +1 more source

Observational Evidence from SDSS for a Merger Origin of the Milky Way's Thick Disk

, 2010
We test competing models that aim at explaining the nature of stars in the Milky Way that are well away (|z|$\gtrsim$ 1kpc) from the midplane, the so-called thick disk: the stars may have gotten there through orbital migration, through satellite mergers ...
Abadi, Abazajian, Brook, Burstein, Carollo, Feltzing, Gilmore, Ivezić, Johnston, Kazantzidis, Klement, Reddy, Roškar, Yanny, Yoachim, Yoshii   +15 more
core   +1 more source