97 citations · 864 across the 42 of their papers we have counts for
42 papers
Secrets behind the RXTE/ASM light curve of Cyg X-3
Osmi Vilhu, Karri Koljonen, Diana Hannikainen
In wind-fed X-ray binaries, the radiatively driven wind of the primary star can be suppressed by the EUV irradiation of the compact secondary star, leading to an increased accretio…
Wind suppression by X-rays in Cygnus X-3
Osmi Vilhu, Timothy R. Kallman, Karri I. Koljonen +1
The radiatively driven wind of the primary star in wind-fed X-ray binaries can be suppressed by the X-ray irradiation of the compact secondary star. This causes feedback between th…
Models for Weak Wind and Momentum Problems in the Winds of Hot Stars
Osmi Vilhu, Timothy R. Kallman
We pesent models for the velocity structure in the supersonic part of hot star winds in order to estimate the effects of clumping in density and velocity. XSTAR (Kallman,2018) was…
Modeling the X-ray light curves of Cygnus X-3. Possible role of the jet
Osmi Vilhu, Diana Carina Hannikainen
Context: Physics behind the soft X-ray light curve asymmetries in Cygnus X-3, a well-known microquasar, was studied. AIMS: Observable effects of the jet close to the line-of-sight…
Orbital modulation of X-ray emission lines in Cygnus X-3
O. Vilhu, P. Hakala, D. C. Hannikainen +2
We address the problem where the X-ray emission lines are formed and investigate orbital dynamics using Chandra HETG observations, photoionizing calculations and numerical wind-par…
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…