Results 31 to 40 of about 916 (166)
THE INCIDENCE OF STELLAR MERGERS AND MASS GAINERS AMONG MASSIVE STARS [PDF]
The Astrophysical Journal, 2014 Because the majority of massive stars are born as members of close binary systems, populations of massive main-sequence stars contain stellar mergers and products of binary mass transfer. We simulate populations of massive stars accounting for all major binary evolution effects based on the most recent binary parameter statistics and extensively ...
de Mink, S.E. +4 more
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Magnetic massive stars from stellar mergers
Proceedings of the International Astronomical Union, 2022 AbstractThe first magnetic field in a star other than the Sun was detected in 1947 in the star 78 Vir. Today, we know that about 10% of these intermediate-mass and high-mass stars have strong, large-scale surface magnetic fields whose origin has remained a mystery till today.
Fabian R. N. Schneider +6 more
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Mergers of accreting stellar-mass black holes [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 We present post-Newtonian $N$-body simulations on mergers of accreting stellar-mass black holes (BHs), where such general relativistic effects as the pericenter shift and gravitational wave (GW) emission are taken into consideration. The attention is concentrated on the effects of the dynamical friction and the Hoyle-Lyttleton mass accretion by ambient
Tagawa, Hiromichi +2 more
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Antitruncated Stellar Disks via Minor Mergers [PDF]
The Astrophysical Journal, 2007 We use hydrodynamic simulations of minor mergers of galaxies to investigate the nature of surface brightness excesses at large radii observed in some spiral galaxies: antitruncated stellar disks. We find that this process can produce the antitruncation via two competing effects: (1) merger-driven gas inflows that concentrate mass in the center of the ...
Younger, Joshua D. +3 more
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Demographics of Hierarchical Black Hole Mergers in Dense Star Clusters
The Astrophysical Journal, 2023 With about one hundred mergers of binary black holes (BBHs) detected via gravitational waves by the LIGO-Virgo-KAGRA (LVK) Collaboration, our understanding of the darkest objects in the universe has taken unparalleled steps forward.
Giacomo Fragione, Frederic A. Rasio
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Black Hole Accretion and Spin-up through Stellar Collisions in Dense Star Clusters
The Astrophysical JournalDynamical interactions in dense star clusters could significantly influence the properties of black holes, leaving imprints on their gravitational-wave signatures.
Fulya Kıroğlu +4 more
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The Astrophysical Journal Letters, 2023 Minor mergers are thought to drive the structural evolution of massive quiescent galaxies; however, existing Hubble Space Telescope (HST) imaging is primarily sensitive to stellar mass ratios ≳1:10.
Katherine A. Suess +19 more
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The Astrophysical JournalWe investigate the stellar shape and size–mass relationship of X-ray-selected active galactic nucleus (AGN) host galaxies using the high angular resolution and deep sensitivity in the near-infrared of the COSMOS-Web JWST survey field. We present the rest-
Bovornpratch Vijarnwannaluk +21 more
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What Do Gravitational-wave Observations Tell Us About Luminous Red Novae?
The Astrophysical JournalLuminous red novae (LRNe) have been argued to be related to the ejection of common envelopes (CEs) in binary star systems. Ejection of CEs leads to tightened stellar orbits capable of forming CBs that merge in Hubble time.
Dhruv Jain +6 more
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, 2019 There are several indications that stellar mergers are common outcomes of binary evolution. Mergers involving white dwarfs are linked to several classes of transients, such as supernova type, and may leave imprints in other observables as well, e.g. the WD mass distribution.
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