Results 31 to 40 of about 1,172 (243)

Stellar Collisions in the Galactic Center: Massive Stars, Collision Remnants, and Missing Red Giants

The Astrophysical Journal, 2023
Like most galaxies, the Milky Way harbors a supermassive black hole (SMBH) at its center, surrounded by a nuclear star cluster. In this dense star cluster, direct collisions can occur between stars before they evolve off the main sequence.
Sanaea C. Rose, Smadar Naoz, Re’em Sari, Itai Linial   +3 more
doaj   +1 more source

Stellar Collisions and the Interior Structure of Blue Stragglers [PDF]

The Astrophysical Journal, 2002
This revised version has 37 pages, 13 figures, 4 tables; submitted to ApJ; for associated software package, see http://vassun.vassar.edu/~lombardi/mmas/ This revised version presents additional comparisons with SPH results and slightly improved merger ...
James C. Lombardi, Jessica S. Warren, Jessica S. Warren, Alison Sills, Alison Sills, Aaron R. Warren, Aaron R. Warren, Frederic A. Rasio, Frederic A. Rasio   +8 more
openaire   +2 more sources

Wave Conversion, Decay, and Heating in a Partially Ionized Two-fluid Magneto-atmosphere

The Astrophysical Journal, 2023
A ray-theoretic phase-space description of linear waves in a two-fluid (charges and neutrals) magnetized plasma is used to calculate analytic decay rates and mode transmission and conversion coefficients between fast and slow waves in two dimensions due ...
Paul S. Cally, M. M. Gómez-Míguez
doaj   +1 more source

Evolution of Stellar Collision Products in Globular Clusters. I. Head‐on Collisions [PDF]

The Astrophysical Journal, 1997
We explore the evolution of collisionally merged stars in the blue straggler region of the HR diagram. The starting models for our stellar evolution calculations are the results of the smoothed particle hydrodynamics (SPH) simulations of parabolic collisions between main sequence stars performed by Lombardi, Rasio and Shapiro (1996).
Alison Sills, Charles D. Bailyn, Pierre Demarque, James C. Lombardi, Frederic A. Rasio, Stuart L. Shapiro   +5 more
openaire   +4 more sources

The role of stellar collisions for the formation of massive stars [PDF]

Monthly Notices of the Royal Astronomical Society, 2011
We use direct N-body simulations of gas embedded star clusters to study the importance of stellar collisions for the formation and mass accretion history of high-mass stars. Our clusters start in virial equilibrium as a mix of gas and proto-stars. Proto-stars then accrete matter using different mass accretion rates and the amount of gas is reduced in ...
Ralf S. Klessen, Ralf S. Klessen, Holger Baumgardt   +2 more
openaire   +5 more sources

Towards the Provision of Accurate Atomic Data for Neutral Iron

Galaxies, 2018
The rich emission and absorption line spectra of Fe I may be used to extract crucial information on astrophysical plasmas, such as stellar metallicities.
Andrew Conroy, Catherine Ramsbottom, Connor Ballance, Francis Keenan   +3 more
doaj   +1 more source

Evolution of stellar collision products in open clusters [PDF]

Astronomy & Astrophysics, 2008
In a companion paper we studied the detailed evolution of stellar collision products that occurred in an $N$-body simulation of the old open cluster M67 and compared our detailed models to simple prescriptions. In this paper we extend this work by studying the evolution of the collision products in open clusters as a function of mass and age of the ...
Glebbeek, E., Pols, O.R.
openaire   +5 more sources

Star−Disk Collisions: Implications for Quasi-periodic Eruptions and Other Transients near Supermassive Black Holes

The Astrophysical Journal
We use Athena++ to study the hydrodynamics of repeated star−accretion disk collisions close to supermassive black holes, and we discuss their implications for the origin of quasi-periodic eruptions (QPEs) and other repeating nuclear transients.
Philippe Z. Yao, Eliot Quataert, Yan-Fei Jiang, Wenbin Lu, Christopher J. White   +4 more
doaj   +1 more source

Mechanistic basis for inhibition of the extended‐spectrum β‐lactamase GES‐1 by enmetazobactam and tazobactam

FEBS Letters, EarlyView.
Antimicrobial resistance (AMR) is of huge importance, resulting in over 1 million deaths each year. Here, we describe how a new drug, enmetazobactam, designed to help fight resistant bacterial diseases, inhibits a key enzyme (GES‐1) responsible for AMR. Our data show it is a more potent inhibitor than the related tazobactam, with high‐level computation
Michael Beer, Philip Hinchliffe, Marko Hanževački, Christopher R. Bethel, Catherine L. Tooke, Marc W. Van der Kamp, Krisztina M. Papp‐Wallace, Robert A. Bonomo, Stuart Shapiro, Adrian J. Mulholland, James Spencer   +10 more
wiley   +1 more source

Multidimensional OMICs reveal ARID1A orchestrated control of DNA damage, splicing, and cell cycle in normal‐like and malignant urothelial cells

Molecular Oncology, EarlyView.
Loss of the frequently mutated chromatin remodeler ARID1A, a subunit of the SWI/SNF cBAF complex, results in less open chromatin, alternative splicing, and the failure to stop cells from progressing through the cell cycle after DNA damage in bladder (cancer) cells. Created in BioRender. Epigenetic regulators, such as the SWI/SNF complex, with important
Rebecca M. Schlösser, Florian Krumbach, Eyleen Corrales, Geoffroy Andrieux, Christian Preisinger, Franziska Liss, Alexandra Golzmann, Melanie Boerries, Kerstin Becker, Ruth Knüchel, Stefan Garczyk, Bernhard Lüscher   +11 more
wiley   +1 more source