Results 61 to 70 of about 625,053 (333)

A SUPER-SOLAR METALLICITY FOR STARS WITH HOT ROCKY EXOPLANETS [PDF]

, 2016
Host star metallicity provides a measure of the conditions in protoplanetary disks at the time of planet formation. Using a sample of over 20,000 Kepler stars with spectroscopic metallicities from the LAMOST survey, we explore how the exoplanet ...
G. Mulders, I. Pascucci, D. Apai, A. Frasca, J. Molenda–Żakowicz   +4 more
semanticscholar   +1 more source

Core to Cosmic Edge: SIMBA-C’s New Take on Abundance Profiles in the Intragroup Medium at z = 0

Universe
We employ the simba-c cosmological simulation to study the impact of its upgraded chemical enrichment model (Chem5) on the distribution of metals in the intragroup medium (IGrM).
Aviv Padawer-Blatt, Zhiwei Shao, Renier T. Hough, Douglas Rennehan, Ruxin Barré, Vida Saeedzadeh, Arif Babul, Romeel Davé, Chiaki Kobayashi, Weiguang Cui, François Mernier, Ghassem Gozaliasl   +11 more
doaj   +1 more source

An empirical prediction for stellar metallicity distributions in nearby galaxies

, 2012
We combine star-formation histories derived from observations of high redshift galaxies with measurements of the z~0 relation between gas-phase metallicity, stellar mass, and star formation rate to make an explicit and completely empirical connection ...
Allende Prieto, Arrigoni, Asplund, Behroozi, Bensby, Bland-Hawthorn, Bouché, Brinchmann, Brooks, Brooks, Bruzual, Chabrier, Colavitti, Conroy, Daddi, Davé, Davé, Dayal, De Lucia, De Lucia, Delahaye, Dolphin, Eisenstein, Elbaz, Ellison, Ellison, Erb, Finlator, Fontanot, Gallazzi, Gallazzi, Garnett, Hirschmann, Hughes, Ivezić, Karim, Kewley, Kewley, Kimm, Kirby, Kirby, Kirby, Klypin, Kobayashi, Kobulnicky, Kormendy, Lara-López, Leitner, Leitner, Lopez-Sanchez, Lynden-Bell, Maiolino, Mannucci, Mannucci, Molly S. Peeples, Moster, Mouhcine, Nagashima, Nicholls, Noeske, Oliver, Oppenheimer, Pagel, Pasquali, Pasquali, Peeples, Rachel S. Somerville, Robaina, Salim, Savaglio, Scannapieco, Shapley, Skelton, Somerville, Sommariva, Spitoni, Thomas, Tinsley, Tinsley, Tissera, Toomre, Trager, Tremonti, Tumlinson, Weisz, Wiersma, Woo, Yabe, Yates, Zahid, Zahid, Zaritsky, Zheng   +92 more
core   +1 more source

Superluminous supernova progenitors have a half-solar metallicity threshold [PDF]

, 2016
Host galaxy properties provide strong constraints on the stellar progenitors of superluminous supernovae. By comparing a sample of 19 low-redshift (z < 0.3) superluminous supernova hosts to galaxy populations in the local Universe, we show that sub-solar
Ting-Wan Chen, S. Smartt, R. Yates, M. Nicholl, T. Krühler, P. Schady, M. Dennefeld, C. Inserra   +7 more
semanticscholar   +1 more source

Revisiting Stability Criteria in Ball‐Milled High‐Entropy Alloys: Do Hume–Rothery and Thermodynamic Rules Equally Apply?

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
The stability criteria affecting the formation of high‐entropy alloys, particularly focusing in supersaturated solid solutions produced by mechanical alloying, are analyzed. Criteria based on Hume–Rothery rules are distinguished from those derived from thermodynamic relations. The formers are generally applicable to mechanically alloyed samples.
Javier S. Blázquez, Alejandro F. Manchón‐Gordón, Antonio Vidal‐Crespo, Rafael Caballero‐Flores, Jhon J. Ipus, Clara F. Conde   +5 more
wiley   +1 more source

CRITICAL METALLICITY FOR POPULATION II STARS

Odessa Astronomical Publications, 2008
We present simple arguments about metallicity of transition from first stellar generation (population III) to the second one. We consider the efficiency of fragmentation in gas induced by thermal instability in cold gas layers and filaments (T < 104 K ...
E. O. Vasiliev, Yu. A. Shchekinov
doaj   +1 more source

Are Stars with Planets Polluted? [PDF]

, 2001
We compare the metallicities of stars with radial velocity planets to the metallicity of a sample of field dwarfs. We confirm recent work indicating that the stars-with-planet sample as a whole is iron rich. However, the lowest mass stars tend to be iron
B. Chaboyer, Gonzalez G., Gonzalez G., Gonzalez G., N. Murray, Santos N. C.   +5 more
core   +3 more sources

Bistable Mechanisms 3D Printing for Mechanically Programmable Vibration Control

Advanced Engineering Materials, EarlyView.
This work introduces a 3D‐printed bistable mechanism integrated into tuned mass dampers (TMDs) for mechanically adaptive passive vibration suppression. Through optimized geometry, the bistable design provides adaptable vibration reduction across a broad range of scenarios, achieving effective vibration mitigation without complex controls or external ...
Ali Zolfagharian, Frédéric Demoly, Mohammad Lakhi, Bernard Rolfe, Mahdi Bodaghi   +4 more
wiley   +1 more source

A near-infrared and optical photometric study of the Sculptor dwarf spheroidal galaxy: implications for the metallicity spread

, 2005
We present here a detailed study of the Sculptor dSph galaxy red giant branch (RGB) and horizontal branch (HB) morphology, combining new near-infrared photometry from CIRSI, with optical data from the ESO WFI.
Babusiaux, C., Gilmore, G., Irwin, M.
core   +1 more source

Cooling Flows and Metallicity Gradients in Clusters of Galaxies [PDF]

, 1995
The X-ray emission by hot gas at the centers of clusters of galaxies is commonly modeled assuming the existence of steady-state, inhomogeneous cooling flows. We derive the metallicity profiles of the intracluster medium expected from such models.
Allen S. W., Andreas Reisenegger,, Carollo C. M., Dickens R. J., Edge A. C., Eli Waxman, Fukazawa Y., Johnstone R. M., Jordi Miralda-Escudé,, Lucey J. R., Miller L., Nulsen P. E. J., Pringle J. E., Tabor G., Tanaka Y., Thomas P. A.   +15 more
core   +2 more sources