Results 11 to 20 of about 197,808 (272)

Signatures of mass segregation from competitive accretion and monolithic collapse [PDF]

arXiv
The two main competing theories proposed to explain the formation of massive ($>10$M$_\odot$) stars -- competitive accretion and monolithic core collapse -- make different observable predictions for the environment of the massive stars during, and immediately after, their formation.
Richard J. Parker, Emily J. Pinson, Hayley L. Alcock, James E. Dale   +3 more
arxiv   +2 more sources

Investigating the effect of massive stars on the dynamical evolution of open clusters, using optimal and random sampling [PDF]

Iranian Journal of Physics Research, 2023
Massive OB stars have an important effect on the dynamical evolution of open star clusters. In the simulation of star clusters, the sampling method to determine the mass function of the cluster affects the number and mass of massive stars. Two methods of
Malihe Rabiee, Akram Hasani Zonoozi, Hosein Haghi   +2 more
doaj   +1 more source

The evolution of massive binary systems [PDF]

Serbian Astronomical Journal, 2020
The evolution of massive stars in close binary systems is significantly different from single star evolution due to a series of interactions between the two stellar components.
Petrović Jelena
doaj   +1 more source

Eta Carinae: The Dissipating Occulter Is an Extended Structure

The Astrophysical Journal, 2023
Previous Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) longslit observations of Eta Carinae ( η Car) identified numerous absorption features in both the stellar spectrum, and in the adjacent nebular spectra, along our line of ...
Theodore R. Gull, Henrik Hartman, Mairan Teodoro, D. John Hillier, Michael F. Corcoran, Augusto Damineli, Kenji Hamaguchi, Thomas Madura, Anthony F. J. Moffat, Patrick Morris, Krister Nielsen, Noel D. Richardson, Ian R. Stevens, Gerd Weigelt   +13 more
doaj   +1 more source

Semi‐supervised classification of fundus images combined with CNN and GCN

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose Diabetic retinopathy (DR) is one of the most serious complications of diabetes, which is a kind of fundus lesion with specific changes. Early diagnosis of DR can effectively reduce the visual damage caused by DR. Due to the variety and different morphology of DR lesions, automatic classification of fundus images in mass screening can ...
Sixu Duan, Pu Huang, Min Chen, Ting Wang, Xiaolei Sun, Meirong Chen, Xueyuan Dong, Zekun Jiang, Dengwang Li   +8 more
wiley   +1 more source

Yellow Supergiants and Post-red Supergiant Evolution in the Large Magellanic Cloud

The Astronomical Journal, 2023
The empirical evidence for an upper-mass limit for the red supergiant (RSG) progenitors of the Type II-P SNe at about 18 MSun, raises questions about the fate of the most luminous, most massive RSGs.
Roberta M. Humphreys, Terry J. Jones, John C. Martin   +2 more
doaj   +1 more source

Recognizing early MRI signs (or their absence) is crucial in diagnosing metachromatic leukodystrophy

Annals of Clinical and Translational Neurology, Volume 9, Issue 12, Page 1999-2009, December 2022., 2022
Abstract Objectives Metachromatic leukodystrophy (MLD) has characteristic white matter (WM) changes on brain MRI, which often trigger biochemical and genetic confirmation of the diagnosis. In early or pre‐symptomatic disease stages, these typical MRI changes might be absent, hampering early diagnosis.
Daphne H. Schoenmakers, Shanice Beerepoot, Ingeborg Krägeloh‐Mann, Saskia Elgün, Benjamin Bender, Marjo S. van der Knaap, Nicole I. Wolf, Samuel Groeschel   +7 more
wiley   +1 more source

Massive Hypervelocity Runaway Stars in the Large Magellanic Cloud

The Astrophysical Journal, 2023
Since the hypervelocity stars were discovered in the Milky Way, various mechanisms have been proposed to explain these runaway stars. Up to now, however, the dominant ejected mechanism of hypervelocity stars is still unclear.
Zehao Lin, Ye Xu, Chaojie Hao, Yingjie Li, Dejian Liu, Shuaibo Bian   +5 more
doaj   +1 more source

Early-forming Massive Stars Suppress Star Formation and Hierarchical Cluster Assembly

The Astrophysical Journal, 2023
Feedback from massive stars plays an important role in the formation of star clusters. Whether a very massive star is born early or late in the cluster formation timeline has profound implications for the star cluster formation and assembly processes. We
Sean C. Lewis, Stephen L. W. McMillan, Mordecai-Mark Mac Low, Claude Cournoyer-Cloutier, Brooke Polak, Martijn J. C. Wilhelm, Aaron Tran, Alison Sills, Simon Portegies Zwart, Ralf S. Klessen, Joshua E. Wall   +10 more
doaj   +1 more source

A Variational Beam Model for Failure of Cellular and Truss‐Based Architected Materials

Advanced Engineering Materials, EarlyView., 2023
Herein, a versatile and efficient beam modeling framework is developed to predict the nonlinear response and failure of cellular, truss‐based, and woven architected materials. It enables the exploration of their design space and the optimization of their mechanical behavior in the nonlinear regime. A variational formulation of a beam model is presented
Konstantinos Karapiperis, Kaoutar Radi, Zifan Wang, Dennis M. Kochmann   +3 more
wiley   +1 more source