Results 71 to 80 of about 1,299,527 (230)
A young cluster with an extended main-sequence turnoff: confirmation of a prediction of the stellar rotation scenario [PDF]
, 2016 We present Hubble Space Telescope photometry of NGC 1850, a ~100 Myr, ~105 M⊙ cluster in the Large Magellanic Cloud. The colour-magnitude diagram clearly shows the presence of an extended main-sequence turnoff (eMSTO).
N. Bastian +15 more
semanticscholar +1 more source
Physics of Rotation in Stellar Models [PDF]
, 2009 32 pages, 7 figures, lectures, CNRS school, will be published by ...
openaire +3 more sources
The Astrophysical JournalSurveys of exoplanet host stars are valuable tools for assessing population level trends in exoplanets, and their outputs can include stellar ages, activity, and rotation periods.
Howard Isaacson +6 more
doaj +1 more source
The difference in age of the two counter-rotating stellar disks of the spiral galaxy NGC 4138 [PDF]
A&A 570, A79 (2014), 2014 The Sa spiral NGC 4138 is known to host two counter-rotating stellar disks, with the ionized gas co-rotating with one of them. We measured the kinematics and properties of the two counter-rotating stellar populations to constrain their formation scenario. A spectroscopic decomposition of the observed major-axis spectrum was performed to disentangle the
arxiv +1 more source
Star-planet interactions: I. Stellar rotation and planetary orbits [PDF]
, 2016 Context. As a star evolves, the planet orbits change with time due to tidal interactions, stellar mass losses, friction and gravitational drag forces, mass accretion and evaporation on/by the planet.
Giovanni Privitera +5 more
semanticscholar +1 more source
Constraining Stellar Rotation at the ZAMS
, 2021 As Solar-type stars approach the main sequence, they contract and spin more rapidly; once they reach the main sequence, they stop contracting and their spin speed decreases. This spin-down is thought to be caused by angular momentum lost via stellar winds, but there are currently limited constraints on model behavior at this critical age.
Douglas, Stephanie T. +7 more
openaire +3 more sources
Living with a Red Dwarf: The Rotation–Age Relationships of M Dwarfs
The Astrophysical Journal Letters, 2023 Age is a fundamental stellar property, yet for many stars, it is difficult to reliably determine. For M dwarfs, it has been notoriously so. Due to their lower masses, core hydrogen fusion proceeds at a much slower rate in M dwarfs than it does in more ...
Scott G. Engle, Edward F. Guinan
doaj +1 more source
Differential rotation of main-sequence dwarfs: predicting the dependence on surface temperature and rotation rate [PDF]
, 2012 Gyrochronology and recent theoretical findings are used to reduce the number of input parameters of differential rotation models. This eventually leads to a theoretical prediction for the surface differential rotation as a function of only two stellar parameters - surface temperature and rotation period - that can be defined observationally.
arxiv +1 more source
The Missing Magnetic Morphology Term in Stellar Rotation Evolution [PDF]
, 2016 This study examines the relationship between magnetic field complexity and mass and angular momentum losses. Observations of open clusters have revealed a bimodal distribution of the rotation periods of solar-like stars that has proven difficult to ...
C. Garraffo, J. Drake, O. Cohen
semanticscholar +1 more source
First grids of low-mass stellar models and isochrones with self-consistent treatment of rotation [PDF]
Astronomy & Astrophysics, 2019 Aims.We present an extended grid of state-of-the art stellar models for low-mass stars including updated physics (nuclear reaction rates, surface boundary condition, mass-loss rate, angular momentum transport, rotation-induced mixing, and torque ...
L. Amard +6 more
semanticscholar +1 more source