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99 papers · 1 filter
First measurement of the magnetic field on FK Com and its relation to the contemporaneous starspot locations
H. Korhonen, S. Hubrig, S. V. Berdyugina +5
In this study we present simultaneous low-resolution longitudinal magnetic field measurements and high-resolution spectroscopic observations of the cool single giant FK Com. The va…
Alpha effect and turbulent diffusion from convection
P. J. Käpylä, M. J. Korpi, A. Brandenburg
(abridged) Aims: To study turbulent transport coefficients that describe the evolution of large-scale magnetic fields in turbulent convection. Methods: We use the test field method…
Light Curve Morphology Study of UW CrB -- Evidence for a 5 d Superorbital Period
Pasi Hakala, Linnea Hjalmarsdotter, Diana C. Hannikainen +1
Since its discovery in 1990, UW CrB (also known as MS1603+2600) has remained a peculiar source without firm classification. Our current understanding is that it is an Accretion Dis…
Turbulent stresses as a function of shear rate in a local disk model
A. J. Liljeström, M. J. Korpi, P. J. Käpylä +2
We present local numerical models of accretion disk turbulence driven by the magnetorotational instability with varying shear rate. The resulting turbulent stresses are compared wi…
Exploring the spreading layer of GX 9+9 using RXTE and INTEGRAL
P. Savolainen, D. C. Hannikainen, O. Vilhu +3
We have fitted ~200 RXTE and INTEGRAL spectra of the neutron star LMXB GX 9+9 from 2002-2007 with a model consisting of a disc blackbody and another blackbody representing the spre…
Discovery of two distinct polarimetric behaviours of trans-Neptunian objects
S. Bagnulo, I. Belskaya, K. Muinonen +4
Trans-Neptunian objects (TNOs) contain the most primitive and thermally least-processed materials from the early accretional phase of the solar system. They allow us to study inter…