Results 51 to 60 of about 183,792 (190)
Absolute Wavelength Shifts - A new diagnostic for rapidly rotating stars [PDF]
arXiv, 2003 Accuracies reached in space astrometry now permit the accurate determination of astrometric radial velocities, without any use of spectroscopy. Knowing this true stellar motion, spectral shifts intrinsic to stellar atmospheres can be identified, for instance gravitational redshifts and those caused by velocity fields on stellar surfaces.
arxiv
Slowing the Spins of Stellar Cores [PDF]
, 2019 The angular momentum (AM) evolution of stellar interiors, along with the resulting rotation rates of stellar remnants, remains poorly understood. Asteroseismic measurements of red giant stars reveal that their cores rotate much faster than their surfaces, but much slower than theoretically predicted, indicating an unidentified source of AM transport ...
arxiv +1 more source
Boron Abundances in Early B Dwarfs of the Galactic Open Cluster NGC 3293
The Astrophysical JournalNew boron abundances or upper limits have been determined for eight early B stars in the young Galactic open cluster NGC 3293, using UV spectra obtained by the Hubble Space Telescope Cosmic Origins Spectrograph.
Charles R. Proffitt +6 more
doaj +1 more source
Modeling the Progenitor Stars of Observed Type IIP Supernovae
The Astrophysical JournalType IIP supernovae (SNe IIP) are thought to originate from the explosion of massive stars >10 M _⊙ . Their luminosity is primarily powered by the explosion energy and the radioactive decay energy of ^56 Co, with the photosphere location regulated by ...
Kai-An You +4 more
doaj +1 more source
Global-scale Simulations of Stellar Convection and their Observational Predictions [PDF]
arXiv, 2011 Stars on the lower main sequence (F-type through M-type) have substantial convective envelopes beneath their stellar photospheres. Convection in these regions can couple with rotation to build global-scale structures that may be observable by interferometers that can resolve stellar disks. Here I discuss predictions emerging from 3D MHD simulations for
arxiv
The Role of Meridional Flow in the Generation of Solar/Stellar Magnetic Fields and Cycles
The Astrophysical JournalMeridional flow is crucial in generating the solar poloidal magnetic field by facilitating poleward transport of the field from decayed bipolar magnetic regions (BMRs).
Vindya Vashishth, Bidya Binay Karak
doaj +1 more source
Internal rotation of red giants by asteroseismology
EPJ Web of Conferences, 2013 We present an asteroseismic approach to study the dynamics of the stellar interior in red giant stars by asteroseismic inversion of the splittings induced by the stellar rotation on the oscillation frequencies.
Christensen-Dalsgaard J. +14 more
doaj +1 more source
Rotational Evolution of Classical T Tauri Stars: Models and Observations
The Astrophysical JournalWe developed a grid of stellar rotation models for low-mass and solar-type classical T Tauri stars (CTTS; 0.3 M _⊙ < M _* < 1.2 M _⊙ ). These models incorporate the star–disk interaction and magnetospheric ejections to investigate the evolution of the ...
Javier Serna +19 more
doaj +1 more source
Effects of Rotation on Stellar p-Mode Frequencies [PDF]
arXiv, 2011 Effects of stellar rotation on adiabatic oscillation frequencies of pressure modes are discussed. Methods to evaluate them are briefly exposed and some of their main results are presented.
arxiv