86 citations · 255 across the 12 of their papers we have counts for
12 papers
Simultaneous optical and near-IR photometry of 4U 1957+115 - a missing secondary star
Pasi Hakala, Panu Muhli, Phil Charles
We report the results of quasi-simultaneous optical and NIR photometry of the low-mass X-ray binary, 4U 1957+115. Our observations cover B, V, R, I, J, H and K-bands and additional…
Phase-resolved optical and X-ray spectroscopy of low-mass X-ray binary X1822-371
A. Somero, P. Hakala, P. Muhli +2
(Abridged) X1822-371 is the prototypical accretion disc corona X-ray source, a low-mass X-ray binary viewed at very high inclination, thereby allowing the disc structure and extend…
Fast Optical and X-ray Variability in the UCXB 4U0614+09
Pasi Hakala, Phil Charles, Panu Muhli
We present results from several years of fast optical photometry of 4U0614+091 (V1055 Orionis), a candidate ultracompact X-ray binary most likely consisting of a neutron star and a…
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…
The nature of the infrared counterpart of IGR J19140+0951
D. C. Hannikainen, M. G. Rawlings, P. Muhli +3
The INTEGRAL observatory has been (re-)discovering new X-ray sources since the beginning of nominal operations in early 2003. These sources include X-ray binaries, Active Galactic…
XMM-Newton observations of UW CrB -- detection of X-ray bursts and evidence for accretion disc evolution
P. Hakala, G. Ramsay, P. Muhli +4
UW CrB (MS1603+2600) is a peculiar short period X-ray binary that exhibits extraordinary optical behaviour. The optical light curve shape of the system changes drastically from nig…