Results 81 to 90 of about 29,892 (197)

Low-resolution spectroscopy of main sequence stars belonging to 12 Galactic globular clusters. I. CH and CN band strength variations

, 2010
Globular clusters show abundance variations for light elements that are not yet well understood. The preferred explanation involves a self-enrichment scenario, with two subsequent generations of stars.
Alcaino, Alcaino, Anderson, Appenzeller, Baumgardt, Bedin, Bekki, Bellazzini, Bellazzini, Bolte, Bonifacio, Briley, Briley, Briley, Briley, Briley, Briley, Brown, Brown, Buonanno, Buonanno, Caldwell, Cannon, Cannon, Carrera, Carretta, Carretta, Carretta, Carretta, Carretta, Carretta, Carretta, Carretta, Carretta, Casetti-Dinescu, Cassisi, Catelan, Chakrabarty, Charbonnel, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Cottrell, Cunha, Da Costa, Da Costa, Dalessandro, de Mink, de Silva, Decressin, Denisenkov, Denissenkov, Denissenkov, Dinescu, Dinescu, Dinescu, Durrell, D’Antona, D’Antona, D’Antona, D’Ercole, E. Pancino, Feltzing, Francois, Frenk, Frogel, Fulbright, Gallart, Gnedin, Gratton, Gratton, Gratton, Gratton, Gratton, Gratton, Gratton, Grundahl, Han, Hanson, Harbeck, Harris, Hesser, Hesser, Hilker, Ho, Ibata, Iben, Irwin, James, Johnson, Kayser, Kayser, Kiselev, Kraft, Kraft, Laird, Lane, Langer, Lanzoni, Lee, Lee, Lee, Lehnert, Letarte, M. Rejkuba, M. Zoccali, Mackey, Mackey, Maeder, Majewski, Manduca, Mandushev, Marino, Marino, Martell, Marín-Franch, McClure, McLaughlin, McNamara, Milone, Milone, Minniti, Mishenina, Monaco, Moretti, Mucciarelli, Norris, Norris, Norris, Norris, Norris, Osborn, Pancino, Pancino, Pancino, Pasquini, Penny, Peterson, Pilachowski, Piotto, Piotto, Piotto, Prantzos, Prantzos, Pritzl, Pryor, R. Carrera, Ramírez, Recio-Blanco, Renzini, Rich, Richter, Rosenberg, Rosenberg, Rosenberg, Rosenberg, Rutledge, Salaris, Samus, Samus, Sbordone, Sbordone, Shetrone, Shetrone, Smith, Smith, Smith, Smith, Smith, Smith, Smith, Smith, Smith, Smith, Smith, Smith, Smith, Smith, Sneden, Sneden, Sollima, Sollima, Stetson, Stetson, Stetson, Suntzeff, Suntzeff, Sweigart, Thoul, van den Bosch, van Dokkun, Vargas Álvarez, Ventura, Ventura, Ventura, Villanova, Villanova, Vollmann, Willemsen, Yong, Yong, Yong, Yong, Yoon, Zinn, Zinn, Zinn, Zoccali   +212 more
core   +1 more source

Autogenic Formation of Bimodal Grain Size Distributions in Rivers and Its Contribution to Gravel‐Sand Transitions

Geophysical Research Letters
Riverbeds often fine downstream, with a gravel‐bedded reach, a relatively abrupt gravel‐sand transition (GST), and a sand‐bedded reach. Underlying this behavior, bed grain size distributions are often bimodal, with a relative paucity (gap) around the ...
Chenge An, Gary Parker, Jeremy G. Venditti, Michael P. Lamb, Marwan A. Hassan, Hiroshi Miwa, Xudong Fu   +6 more
doaj   +1 more source

On the Origin of [OII] Emission in Red Sequence and Post-starburst Galaxies

, 2005
We investigate the emission-line properties of galaxies with red rest-frame colors using spectra from SDSS DR4. Emission lines are detected in more than half of the red galaxies.
Binette L., David Koo, Goto T., Goudfrooij P., Heckman T. M., Jeffrey A. Newman, Marc Davis, Nicholas Konidaris, Renbin Yan, Rola C. S., S. M. Faber, Sarzi M.   +11 more
core   +1 more source

Exploring latitudinal gradients and environmental drivers of amphipod biodiversity patterns regarding depth and habitat variations

Scientific Reports
Amphipods are known as umbrella species in conservation biology that their protection indirectly protects other species. Recent hypotheses suggest a bimodal latitudinal global species richness pattern for amphipods, irrespective of species’ depth or ...
Farzaneh Momtazi, Hanieh Saeedi
doaj   +1 more source

The baryonic halos of isolated elliptical galaxies

, 2017
Without the interference of a number of events, galaxies may suffer in crowded environments (e.g., stripping, harassment, strangulation); isolated elliptical galaxies provide a control sample for the study of galaxy formation.
Alabi, Adebusola, Hammar, Nicklas, Lane, Richard R., Richtler, Tom, Salinas, Ricardo, Schirmer, Mischa   +5 more
core   +1 more source

Latitudinal diversity of planktonic copepods in the Eastern Pacific: overcoming sampling biases and predicting patterns

Frontiers in Ecology and Evolution
Gradients of latitudinal diversity are one of the biogeographic features calling the most attention in ecology and macroecology. However, in pelagic communities of the marine environment, geographic trends and patterns are poorly known.
Reinaldo Rivera, Ruben Escribano, Ruben Escribano, Carolina E. González, Manuela Pérez-Aragón   +4 more
doaj   +1 more source

Modeling Formation of Globular Clusters: Beacons of Galactic Star Formation

, 2010
Modern hydrodynamic simulations of galaxy formation are able to predict accurately the rates and locations of the assembly of giant molecular clouds in early galaxies.
Gnedin, Oleg Y.
core   +1 more source

Rising from the Ashes. II. The Bar-driven Abundance Bimodality of the Milky Way

The Astrophysical Journal
The Milky Way hosts at least two modes in its present-day distribution of Fe and α -elements. The exact cause of this bimodality is disputed, but one class of explanations involves the merger between the Milky Way and a relatively massive satellite (Gaia-
Angus Beane, James W. Johnson, Vadim A. Semenov, Lars Hernquist, Vedant Chandra, Charlie Conroy   +5 more
doaj   +1 more source

Ecologically realistic modalities in arthropod supercooling point distributions

European Journal of Entomology, 2006
Modality in the supercooling points of cold tolerant but freezing intolerant terrestrial arthropods has proved a pragmatically reliable means of distinguishing between summer and winter cold hardiness in such species.
Timothy C. HAWES, Jeffrey S. BALE, Peter CONVEY, Roger WORLAND   +3 more
doaj   +1 more source

Age bimodality in the central region of pseudobulges in S0 galaxies

, 2017
We present evidence for bimodal stellar age distribution of pseudobulges of S0 galaxies as probed by the $D_n(4000)$ index. We do not observe any bimodality in age distribution for pseudobulges in spiral galaxies.
Barway, Sudhanshu, Mishra, Preetish K., Wadadekar, Yogesh   +2 more
core   +1 more source