Results 131 to 140 of about 3,131 (230)

WIYN Open Cluster Study. XCVII. An Extended Radial-velocity Survey and Spectroscopic Binary Orbits in the Open Cluster NGC 188

The Astronomical Journal
We present 35 new spectroscopic-binary orbits from our extended radial-velocity (RV) survey of the old (6.4 ± 0.2 Gyr) open cluster NGC 188. Using data from the WIYN Open Cluster Study (WOCS) and APOGEE-2, this work nearly doubles the temporal baseline ...
Ritvik Sai Narayan, Evan Linck, Robert D. Mathieu, Aaron M. Geller   +3 more
doaj   +1 more source

Two distinct sequences of blue straggler stars in the globular cluster M30

, 2009
Stars in globular clusters are generally believed to have all formed at the same time, early in the Galaxy's history. 'Blue stragglers' are stars massive enough that they should have evolved into white dwarfs long ago.
A Marín-Franch, A Sills, A. I. Karakas, A. Sills, B Tian, B. Lanzoni, C Knigge, CD Bailyn, E Noyola, E. Dalessandro, F. Fusi Pecci, F. R. Ferraro, FR Ferraro, FR Ferraro, FR Ferraro, FR Ferraro, G Meylan, G. Beccari, IR King, J Hurley, JG Hills, M Mapelli, MB Davies, MM Shara, O Vilhu, P Cariulo, P Hartigan, P Pietrukowicz, P. Miocchi, PB Stetson, PB Stetson, PJT Leonard, R. T. Rood, S Djorgovski, S McMillian, S. Bovinelli, SC Trager, WE Harris, WH McCrea   +38 more
core   +1 more source

Ultrahigh Stiffness and Energy Absorption Properties of Isotropic Metallic Closed Cell Microlattices

Small, EarlyView.
True closed cell microlattices without holes are fabricated for the first time using a novel Laser Sheet Fusion additive manufacturing technique. These microlattices exhibited isotropy in stiffness and surprisingly, strength and plasticity as well, despite orientation‐dependent failure mechanisms. Furthermore, material work hardening is shown to be key
Dominic Kang Jueh Lim, Chang Quan Lai
wiley   +1 more source

Blue Straggler in the Making: An X-Ray Active Binary in Algol Configuration

The Astrophysical Journal Letters
We report an extremely rare X-ray active blue straggler star (BSS) in Collinder 261, undergoing ongoing Roche-lobe overflow in a semidetached binary in an Algol-type configuration with an orbital period of P _orb  ∼ 2.112 days, providing direct ...
A. H. Sheikh, Biman J. Medhi, Annapurni Subramaniam, Sergio Messina, Susmita Das, Hitendra Sarkar, Anupam Bhardwaj, Atila Poro, Marina Kounkel, Ram Sagar   +9 more
doaj   +1 more source

Variability in the Massive Open Cluster NGC 1817 from K2: A Rich Population of Asteroseismic Red Clump, Eclipsing Binary, and Main-sequence Pulsating Stars. [PDF]

Astron J, 2020
Sandquist EL, Stello D, Arentoft T, Brogaard K, Grundahl F, Vanderburg A, Hedlund A, DeWitt R, Ackerman TR, Aguilar M, Buckner AJ, Juarez C, Ortiz AJ, Richarte D, Rivera DI, Schlapfer L.   +15 more
europepmc   +1 more source

Bright Variable Stars in NGC 6819 - An Open Cluster in the Kepler Field

, 2010
We describe a variability study of the moderately old open cluster NGC 6819. We have detected 4 new detached eclipsing binaries near the cluster turnoff (one of which may be in a triple system). Several of these systems should be able to provide mass and
Antonio Talamantes, Auner, Bragaglia, David D. Balam, Eric L. Sandquist, Ferraro, Geller, Hartman, Hole, James L. Clem, Kalirai, Matthew Shetrone, Milone, Pamyatnykh, Pigulski, Rosvick, Rucinski, Russell M. Robb, Samus, Sanders, Sandquist, Shetrone, Stello, VandenBerg, Williams   +24 more
core   +1 more source

Cytogenotoxic Effects of Fluopyram in Allium cepa Root Cells Involving Microtubule Disruption

Environmental Toxicology, EarlyView.
ABSTRACT Fluopyram is a next‐generation fungicide widely used in agriculture; however, its persistence in soils and mobility toward aquatic systems have raised concerns regarding potential ecotoxicological risks. This study evaluated the cytogenotoxic effects of a commercial fluopyram‐based pesticide formulation on Allium cepa root meristem cells ...
Carlos Filipe Camilo‐Cotrim, Natanael Alves da Silva, Gabriela Gomes Lima, Igor Rodrigues Vasconcelos, Luciana Souza Ondei, Elisa Flávia Luiz Cardoso Bailão, Antônio Sérgio Nakao de Aguiar, Marcelino Benvindo‐Souza, Leonardo Luiz Borges, Virgínia Damin, Luciane Madureira Almeida   +10 more
wiley   +1 more source

Stellar Spin-down in Post-mass-transfer Binary Systems

The Astrophysical Journal
Motivated by measurements of the rotation speed of accretor stars in post-mass-transfer (post-MT) systems, we investigate how magnetic braking affects the spin-down of individual stars during binary evolution with the MESAbinary module.
Meng Sun, Seth Gossage, Emily M. Leiner, Aaron M. Geller   +3 more
doaj   +1 more source

UBVI CCD Photometry of the Old Open Cluster NGC 1193

, 2008
We present UBVI photometry of the old open cluster NGC 1193. Color-magnitude diagrams (CMDs) of this cluster show a well defined main sequence and a sparse red giant branch.
Hiriart, David, Kim, Sang Chul, Kyeong, Jaemann, Sung, Eon-Chang   +3 more
core   +1 more source

Fate of orphans of Canada geese harvested by hunters in Connecticut, USA, depends upon which month the parents were killed

Wildlife Biology, EarlyView.
Little is known about what happens to juvenile birds after one or both of their parents are harvested by hunters during the post‐fledging dependency period. Here, we compare the fate of juvenile Canada geese Branta canadensis that lost ≥ 1 parent to hunters (orphans) during this period to other juveniles that retained both parents (non‐orphans). For 25
Michael R. Conover, Lauren J. Head
wiley   +1 more source