Results 31 to 40 of about 291,295 (360)
High Resolution Rotation Curves of Low Surface Brightness Galaxies [PDF]
High resolution Halpha rotation curves are presented for five low surface brightness galaxies. These Halpha rotation curves have shapes different from those previously derived from HI observations, probably because of the higher spatial resolution of the
Madore, B. F.+2 more
core +3 more sources
Asteroseismic inversions for radial differential rotation of Sun-like stars: Sensitivity to uncertainties [PDF]
We quantify the effect of observational spectroscopic and asteroseismic uncertainties on regularised least squares (RLS) inversions for the radial differential rotation of Sun-like and subgiant stars. We first solved the forward problem to model rotational splittings plus the observed uncertainties for models of a Sun-like star, HD 52265, and a ...
arxiv +1 more source
Disk accretion onto a magnetized star
The problem of interaction of the rotating magnetic field, frozen to a star, with a thin well conducting accretion disk is solved exactly. It is shown that a disk pushes the magnetic field lines towards a star, compressing the stellar dipole magnetic ...
Istomin Ya. N., Haensel P.
doaj +1 more source
Effects of thermohaline instability and rotation-induced mixing on the evolution of light elements in the Galaxy : D, 3He and 4He [PDF]
Recent studies of low- and intermediate-mass stars show that the evolution of the chemical elements in these stars is very different from that proposed by standard stellar models.
Asplund+88 more
core +2 more sources
Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis
The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M _⊕ and a 15.5 day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 days and surface differential rotation very similar to the Sun.
Travis S. Metcalfe+33 more
doaj +1 more source
Rotational periods and evolutionary models for subgiant stars observed by CoRoT [PDF]
We present rotation period measurements for subgiants observed by CoRoT. Interpreting the modulation of stellar light that is caused by star-spots on the time scale of the rotational period depends on knowing the fundamental stellar parameters. Constraints on the angular momentum distribution can be extracted from the true stellar rotational period. By
arxiv +1 more source
Stellar multiplicity and stellar rotation: insights from APOGEE
ABSTRACTWe measure rotational broadening in spectra taken by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey to characterize the relationship between stellar multiplicity and rotation. We create a sample of 2786 giants and 24 496 dwarfs with stellar parameters and multiple radial velocities from the APOGEE pipeline, projected
Christine Mazzola Daher+20 more
openaire +3 more sources
Rotation periods of exoplanet host stars [PDF]
The stellar rotation periods of ten exoplanet host stars have been determined using newly analysed Ca II H & K flux records from Mount Wilson Observatory and Stromgren b, y photometric measurements from Tennessee State University's automatic photometric ...
Baliunas+67 more
core +3 more sources
Observable Signatures of Classical T Tauri Stars Accreting in an Unstable Regime
We discuss key observational signatures of Classical T Tauri stars (CTTSs) accreting through Rayleigh-Taylor instability, which occurs at the interface between an accretion disk and a stellar magnetosphere.
Kurosawa Ryuichi, Romanova M. M.
doaj +1 more source
We perform intensity variability analyses (photometric analyses: the Lomb–Scargle periodogram, autocorrelation, and wavelet) and asteroseismic analysis of 92 Kepler solar-like main-sequence stars to understand the reliability of the measured stellar ...
Yuting Lu+3 more
doaj +1 more source