Results 11 to 20 of about 35,527 (304)
Stellar Black Holes Can “Stretch” Supermassive Black Hole Accretion Disks
The Astrophysical Journal LettersStellar black holes (sBHs) are widely believed to exist in the accretion disks of active galactic nuclei (AGNs). Previous studies often focus on the transient emission produced by embedded sBHs. Here, we explore the possible observational consequences of
Shuying Zhou +5 more
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Stellar and Accretion Disk Parameters of the Close Binary HD 50526 [PDF]
The Astronomical Journal, 2021 Abstract We present a photometric and spectroscopic study of HD 50526, an ellipsoidal binary member of the group Double Periodic Variable stars. Performing data mining in photometric surveys and conducting new spectroscopic observations with several spectrographs during 2008–2015, we obtained orbital and stellar parameters of the system.
J. A. Rosales +7 more
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Disk Accretion and the Stellar Birthline [PDF]
The Astrophysical Journal, 1997 We present a simplified analysis of some effects of disk accretion on the early evolution of fully convective, low-mass pre-main-sequence stars. Our analysis builds on the previous seminal work of Stahler, but it differs in that the accretion of material occurs over a small area of the stellar surface, such as through a disk or magnetospheric accretion
Lee Hartmann +2 more
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How accretion of planet-forming disks influences stellar abundances
Astronomy & Astrophysics, 2023 Millimeter-sized dust grains experience radial velocities exceeding the gas velocities by orders of magnitude. The viscous evolution of the accretion disk adds disk material onto the central star’s convective envelope, influencing its elemental abundances, [X/H].
L.-A. Hühn, B. Bitsch
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Nonstationary magnetic microstructures in stellar thin accretion disks [PDF]
Physical Review E, 2013 14 text pages, 5 figures, to be published on ...
MONTANI, Giovanni, PETITTA, JACOPO
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An Old, Metal-rich Accreted Stellar Component in the Milky Way Stellar Disk
The Astrophysical Journal, 2022 Abstract We study the possibility that the Milky Ways’ cool stellar disk includes mergers with ancient stars. Galaxies are understood to form in a hierarchical manner, where smaller (proto-)galaxies merge into larger ones. Stars in galaxies, like the Milky Way, contain in their motions and elemental abundance tracers of past events and ...
Diane K. Feuillet +3 more
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Axisymmetric MHD Simulations of Stellar Magnetosphere/Accretion Disk Interaction [PDF]
International Astronomical Union Colloquium, 1997 AbstractThe evolution of the inner disk region of magnetized accreting systems is studied by means of numerical simulations. Two different initial magnetic field topologies are studied: a pure dipole field which threads the disk continuously and a dipole field excluded from the disk by surface currents.
Kristen Miller, James Stone
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Stellar Disk in the Galactic Center: A Remnant of a Dense Accretion Disk? [PDF]
The Astrophysical Journal, 2003 submitted to ApJ ...
Levin, Yuri, Beloborodov, Andrei M.
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Investigating accretion disk – radio jet coupling across the stellar mass scale [PDF]
Proceedings of the International Astronomical Union, 2010 AbstractRelationships between the X-ray and radio behavior of black hole X-ray binaries during outbursts have established a fundamental coupling between the accretion disks and radio jets in these systems. I begin by reviewing the prevailing paradigm for this disk-jet coupling, also highlighting what we know about similarities and differences with ...
Miller-Jones, J.C.A. +15 more
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The Astrophysical Journal, 2023 Strong iron lines are a common feature of the optical spectra of active galactic nuclei (AGNs) and quasars from z ∼ 6−7 to the local universe, and [Fe/Mg] ratios do not show cosmic evolution.
Jian-Min Wang +8 more
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