Results 11 to 20 of about 801 (259)
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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Tracing episodic accretion with NOEMA: FU Orionis-type stars and their millimeter environment [PDF]
EPJ Web of Conferences, 2022 The earliest phases of star formation are characterised by intense mass accretion from the circumstellar disk to the central star. One group of lowmass young stellar objects, FU Orionis-type stars (FUors) exhibit accretion rate peaks accompanied by ...
Fehér O. +6 more
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The –M disk Relationship for Herbig Ae/Be Stars: A Lifetime Problem for Disks with Low Masses?
The Astronomical Journal, 2023 The accretion of material from protoplanetary disks onto their central stars is a fundamental process in the evolution of these systems and a key diagnostic in constraining the disk lifetime. We analyze the relationship between the stellar accretion rate
Sierra L. Grant +5 more
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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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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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Inconsistency in the standard model for stellar thin accretion disks [PDF]
Physical Review D, 2012 We analyze the configuration of a thin rotating accretion disk, which is embedded in a magnetic field inducing a backreaction in the gravitating plasma. The aim of this study is to determine the conditions under which the gaseous accretion model of Shakura can be reconciled with the magnetohydrodynamical picture requested to trigger the underlying ...
Giovanni Montani, Nakia Carlevaro
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Near-infrared Accretion Signatures from the Circumbinary Planetary-mass Companion Delorme 1 (AB)b
The Astrophysical Journal Letters, 2022 Accretion signatures from bound brown dwarf and protoplanetary companions provide evidence for ongoing planet formation, and accreting substellar objects have enabled new avenues to study the astrophysical mechanisms controlling the formation and ...
S. K. Betti +10 more
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The Astrophysical Journal, 2023 Stellar-mass black holes can become embedded within the disks of active galactic nuclei (AGNs). Afterwards, their interactions are mediated by their gaseous surroundings.
Nicholas Kaaz +4 more
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Interaction of young stellar object jets with their accretion disk [PDF]
Astronomy & Astrophysics, 2005 I reexamine recent observations of velocity profiles across jets blown by young stellar objects, and argue that the observations do not support the interpretation of jets rotating around their symmetry axes. Instead, I propose that the interaction of the jets with a twisted-tilted (wrapped) accretion disk can form the observed asymmetry in the jets ...
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Young Stellar Objects, Accretion Disks, and Their Variability with Rubin Observatory LSST
The Astrophysical Journal Supplement Series, 2023 Abstract Vera C. Rubin Observatory, through the Legacy Survey of Space and Time (LSST), will allow us to derive a panchromatic view of variability in young stellar objects (YSOs) across all relevant timescales. Indeed, both short-term variability (on timescales of hours to days) and long-term variability (months to years), predominantly ...
R. Bonito +16 more
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