Results 91 to 100 of about 625,053 (333)

Short Lifetime of Protoplanetary Disks in Low-metallicity Environments

, 2010
We studied near-infrared disk fractions of six young clusters in the low-metallicity environments with [O/H$] \sim -0.7$ using deep $JHK$ images with Subaru 8.2\,m telescope. We found that disk fraction of the low-metallicity clusters declines rapidly in
Andrews, Briceño, Carpenter, Chini, Fischer, Gorti, Haisch, Hernández, Hollenbach, Ida, Ida, Klein, Kobayashi, Lada, Lissauer, Lubowich, Luhman, Muench, Preibisch, Rudolph, Safronov, Schneider, Sicilia-Aguilar, Sicilia-Aguilar, Suzuki, Yasui, Yasui   +26 more
core   +1 more source

The California-Kepler Survey. IV. Metal-rich Stars Host a Greater Diversity of Planets [PDF]

, 2018
Probing the connection between a star's metallicity and the presence and properties of any associated planets offers an observational link between conditions during the epoch of planet formation and mature planetary systems. We explore this connection by
Fulton, Benjamin J., Howard, Andrew W., Isaacson, Howard, Johnson, John Asher, Marcy, Geoffrey W., Morton, Timothy D., Petigura, Erik A., Sinukoff, Evan, Weiss, Lauren M., Winn, Joshua N.   +9 more
core   +3 more sources

THE UNIVERSAL STELLAR MASS–STELLAR METALLICITY RELATION FOR DWARF GALAXIES [PDF]

, 2013
We present spectroscopic metallicities of individual stars in seven gas-rich dwarf irregular galaxies (dIrrs), and we show that dIrrs obey the same mass–metallicity relation as the dwarf spheroidal (dSph) satellites of both the Milky Way and M31: .
E. Kirby, J. Cohen, P. Guhathakurta, L. Cheng, J. Bullock, A. Gallazzi   +5 more
semanticscholar   +1 more source

Efficient Process Development for Laser Powder Bed Fusion of a Soft‐Magnetic Metallic Glass Composite

Advanced Engineering Materials, EarlyView.
Iron‐based metallic glass alloys exhibit excellent soft‐magnetic properties, and unprecedented geometrical freedom in the design of soft‐magnetic metallic glass components is made possible by additive manufacturing. An efficient workflow for developing parameters for laser‐based powder bed fusion of a Fe‐based metallic glass alloy is presented along ...
Julia Löfstrand, Priyanka Saha, Vidhiaza Leviandhika, Urban Wiklund, Alexander Elsen, Carolin Zintel, Lena Thorsson, Petra E. Jönsson   +7 more
wiley   +1 more source

Does Metallicity Affect the Protoplanetary Disk Fraction? Answers from the Outer Milky Way

The Astrophysical Journal
The role of metallicity in shaping protoplanetary disk evolution remains poorly comprehended. This study analyzes the disk fraction of 10 young (0.9–2.1 Myr) and low-metallicity (0.34–0.83 Z _⊙ ) clusters located in the outer Milky Way with ...
Sudeshna Patra, Jessy Jose, Neal J. Evans II   +2 more
doaj   +1 more source

Deriving physical parameters of unresolved star clusters III. Application to M31 PHAT clusters

, 2015
This study is the third of a series that investigates the degeneracy and stochasticity problems present in the determination of physical parameters such as age, mass, extinction, and metallicity of partially resolved or unresolved star cluster ...
de Meulenaer, Philippe, Mineikis, Tadas, Narbutis, Donatas, Vansevičius, Vladas   +3 more
core   +2 more sources

A Possible Solution for the $M/L-\mathrm{[Fe/H]}$ Relation of Globular Clusters in M31. II. the Age-Metallicity Relation [PDF]

, 2017
This is the second of a series of papers in which we present a new solution to reconcile the prediction of single stellar population (SSP) models with the observed stellar mass-to-light ($M/L$) ratios of globular clusters (GCs) in M31 and its trend with ...
Haghi, Hosein, Khalaj, Pouria, Kroupa, Pavel, Zonoozi, Akram Hasani   +3 more
core   +2 more sources

Effects of Carbon Nanoparticles on Triboelectro‐Induced Surface Defects

Advanced Engineering Materials, EarlyView.
Carbon nanoparticles added to grease modify the electrocontact behavior. The synergy of particle concentration and electric current dominates the surface damage of metals in contact. Electrical surface damage caused by current leakage is a critical challenge in high‐performance applications such as electric vehicle (EV) drivetrains and wind turbine ...
Mohsen Tajedini, Lu Fang, Jacob Bons, Mohammad Humaun Kabir, Evan Johnson, Joe Kosmoski, Hong Liang   +6 more
wiley   +1 more source

A study on the metallicity gradients in the galactic disk using open clusters

Frontiers in Astronomy and Space Sciences
We study the metallicity distribution and evolution in the galactic disk based on the largest sample of open star clusters in the galaxy. From the catalog of 1,879 open clusters in the range of galactocentric distance (RGC) from 4 to 20 kpc, we ...
Yogesh Chandra Joshi, Deepak, Sagar Malhotra   +2 more
doaj   +1 more source

Metal–Metal Bonding

, 2013
This chapter deals with the electronic structure of metal-metal bonds in molecular systems, a diverse topic that now spans almost the entire periodic table. The field is most often associated with strong multiple bonds such as the iconic quadruple bond in [Re2Cl8]2-, and the recently discovered ultra-short Cr-Cr quintuple bonds provide a remarkable ...
openaire   +2 more sources