Results 91 to 100 of about 13,091 (256)

Photometry of the Globular Cluster NGC 5466: Red Giants and Blue Stragglers

, 2007
We present wide-field BVI photometry for about 11,500 stars in the low-metallicity cluster NGC 5466. We have detected the red giant branch bump for the first time, although it is at least 0.2 mag fainter than expected relative to the turnoff.
Eggleton P. P., Eric L. Sandquist, Ferraro F. R., Fusi Pecci F., Michael Bolte, Nassissie Fekadu, Piotto G., Zaggia S. R., Zoccali M.   +8 more
core   +1 more source

Evolution of Mass Functions of Coeval Stars through Wind Mass Loss and Binary Interactions [PDF]

, 2015
Accurate determinations of stellar mass functions and ages of stellar populations are crucial to much of astrophysics. We analyse the evolution of stellar mass functions of coeval main sequence stars including all relevant aspects of single- and binary ...
de Mink, S. E., Izzard, R. G., Langer, N., Schneider, F. R. N.   +3 more
core   +2 more sources

UOCS XIV: Study of the Open Cluster NGC 2627 Using UVIT/AstroSat

The Astronomical Journal
We study the intermediate-age open cluster NGC 2627, located at a distance of ∼2 kpc, using UVIT/AstroSat and other archival data. Using a machine learning-based algorithm, ML-MOC, on the Gaia DR3 data, we identify 422 cluster members, including four ...
Pinapati Saketh, Anju Panthi, Kaushar Vaidya   +2 more
doaj   +1 more source

On blue straggler formation by direct collisions of main sequence stars [PDF]

The Astrophysical Journal, 1995
We report the results of new SPH calculations of parabolic collisions between main-sequence (MS) stars. The stars are assumed to be close to the MS turn-off point in a globular cluster and are therefore modeled as $n=3$, $ =5/3$ polytropes. We find that the high degree of central mass concentration in these stars has a profound effect on the ...
Lombardi, Jr., James C., Rasio, Frederic A., Shapiro, Stuart L.   +2 more
openaire   +2 more sources

Néel Tensor Torque in Polycrystalline Antiferromagnets

Advanced Materials, EarlyView.
This work introduces a Néel tensor torque based on a rank‐two symmetric tensor capturing spin correlations in a polycrystalline antiferromagnet. It shows the Néel tensor can be shaped and reshaped through the spin‐orbit torque (SOT) technique, enabling field‐free SOT switching with a specific polarity of the adjacent ferromagnet. This discovery opens a
Chao‐Yao Yang, Sheng‐Huai Chen, Chih‐Hsiang Tseng, Hsiu‐Hau Lin, Chih‐Huang Lai   +4 more
wiley   +1 more source

Field Blue Stragglers and Related Mass Transfer Issues

, 2014
This chapter contains my impressions and perspectives about the current state of knowledge about field blue stragglers (FBS) stars, drawn from an extensive literature that I searched. I conclude my review of issues that attend FBS and mass transfer, by a
A. Buzzoni, A. D. Vanture, A. Duquennoy, A. F. Marino, A. F. Marino, A. G. D. Philip, A. J. Horton, A. Jorissen, A. M. Boesgaard, A. M. Boesgaard, A. Manduca, A. R. Sandage, A. R. Sandage, A. Tokovinin, A. W. Rodgers, A. W. Rodgers, B. Paczynski, B. Tian, B. W. Bopp, B. W. Carney, B. W. Carney, B. Yanny, C. Flynn, C. J. Pritchet, C. L. Perry, C. M. Lance, C. M. Lance, D. A. VandenBergh, D. A. VandenBergh, D. Geisler, D. H. McNamara, D. W. Latham, E. Böhm-Vitense, E. Carretta, E. H. Olsen, E. H. Olsen, E. M. Green, E. Poretti, E. Sirko, F. Marchi De, F. Spite, G Michaud, G. Beccari, G. I. Mandushev, G. P. Kuiper, G. Pietrzyński, G. Piotto, G. W. Preston, G. W. Preston, G. W. Preston, G. W. Preston, G. W. Preston, G. W. Preston, G. W. Preston, G. Wallerstein, H Bondi, H. J. Newberg, H. M. J. Boffin, H. M. J. Boffin, H. Morrison, I Soszyński, I. B. Thompson, I. I. Ivans, I. King, J. A. Thorburn, J. A. Thorburn, J. E. Hesser, J. E. Norris, J. F. Sepinsky, J. F. Sepinsky, J. F. Sepinsky, J. L. Sérsic, J. Norris, J. O. Petersen, J. R. Pier, J. W. Glaspey, K. A. Venn, K. Fuhrmann, K. Fuhrmann, K. Innanen, L. A. Balona, L. Clewley, L. M. Hobbs, L. Searle, M Shetrone, M. Bolte, M. D. Shetrone, M. H. Pinsonneault, M. H. Pinsonneault, M. H. Pinsonneault, M. Livio, M. Livio, M. Mateo, M. Monelli, M. Spite, M. Zoccali, N. Sanduleak, N. Soker, O. J. Eggen, O. Struve, O. Y. Gnedin, P. B. Stetson, P. Côté, P. J. T. Leonard, P. P. Eggleton, R Kippenhahn, R. Buser, R. D. McClure, R. D. McClure, R. E. Cohen, R. E. Davies, R. J. Stancliffe, R. J. Stancliffe, R. W. Hilditch, R. Wilhelm, R. Wilhelm, S. Bisterzo, S. E. Koposov, S. G. Ryan, S. G. Ryan, S. Vauclair, S. Yi, T. A. Smecker-Hane, T. C. Beers, T. C. Beers, T. D. Kinman, T. Masseron, T. Theuns, W. H. McCrea, W. I. Clarkson, W. L. Melbourne, W. R. Brown, X.-X. Xue, Y.-W. Lee, Z. Han   +134 more
core   +1 more source

The Formation Rate of Blue Stragglers in 47 Tucanae [PDF]

, 1999
We investigate the effects of changes in the blue straggler formation rate in globular clusters on the blue straggler distribution in the color-magnitude diagram. We find that the blue straggler distribution is highly sensitive to the past formation rate.
Alison Sills, Auriere M., Charles D. Bailyn, Ferraro F., Peter D. Edmonds, Ronald L. Gilliland   +5 more
core   +3 more sources

Unveiling Bifurcated Blue Straggler Sequences in NGC 2173: Insights from Binary Evolution

The Astrophysical Journal
Identifying bifurcated blue straggler (BS) sequences in color–magnitude diagrams (CMDs) of star clusters has long been regarded as a powerful diagnostic for distinguishing different BS formation mechanisms.
Li Wang, Dengkai Jiang, Chengyuan Li, Licai Deng, Antonino P. Milone, Long Wang   +5 more
doaj   +1 more source

Blue straggler stars in galactic open clusters

, 2021
Blue straggler stars (BSS) were originally identified in the color-magnitude diagram (CMD) of the globular cluster M3, where they defined an extension of the cluster main sequence, blueward and above the turnoff (TO). Among the variety of objects that populate stellar clusters, BSS are surely between those still presenting many puzzles to astronomers ...
openaire   +1 more source

Rapid Fabrication of Self‐Propelled and Steerable Magnetic Microcatheters for Precision Medicine

Advanced Materials, EarlyView.
A rapid Joule heating fabrication method for the production of self‐propelling, adaptive microcatheters, with tunable stiffness and integrated microfluidic channels is presented. Demonstrated through three microrobotic designs, including a steerable guiding catheter, an untethered wave‐crawling TubeBot, and a distal‐end propelled microcatheter, it was ...
Zhi Chen, Boris Rivkin, David Castellanos‐Robles, Ivan Soldatov, Lukas Beyer, Mariana Medina‐Sánchez   +5 more
wiley   +1 more source