122 citations · 3.4k across the 145 of their papers we have counts for
10 papers · 2 filters
Geometrical constraints upon the unipolar model of V407 Vul and RXJ0806.3+1527
S. C. C. Barros, T. R. Marsh, P. Groot +5
V407 Vul and RX J0806.3+1527 are X-ray emitting stars with X-ray light curves that are 100% modulated on periods of 569 and 321 seconds respectively. These periods and no others ar…
XMM-Newton observations of the ultra-compact binary RX J1914+24
Gavin Ramsay, Pasi Hakala, Kinwah Wu +4
We present XMM-Newton observations of the 569 sec period system RX J1914+24 (V407 Vul). This period is believed to represent the binary orbital period making it an ultra-compact bi…
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…
Properties of serendipitous X-ray flares discovered in XMM-Newton observations
Duncan Trenholme, Gavin Ramsay, Carl Foley
We present the results of a search of the XMM-Newton public data archive for stellar X-ray flares. We find eight flaring sources for which we identify 7 optical counterparts. Three…
XMM-Newton observations of the eclipsing polar EP Dra
Gavin Ramsay, C. M. Bridge, Mark Cropper +3
We present XMM-Newton observations of the eclipsing polar EP Dra which cover nearly 3 binary orbital cycles. The X-ray and UV data show evidence for a prominent dip before the ecli…
First observation of Jupiter by XMM-Newton
G. Branduardi-Raymont, R. F. Elsner, G. R. Gladstone +4
We present the first X-ray observation of Jupiter by XMM-Newton. Images taken with the EPIC cameras show prominent emission, essentially all confined to the 0.2-2.0 keV band, from…
Accretion stream mapping with genetically modified "fire-flies"
C. M. Bridge, Pasi Hakala, Mark Cropper +1
We apply an eclipse mapping technique using `genetically modified fire-flies' to the eclipse light curves of HU Aqr and EP Dra. The technique makes as few assumptions as possible a…
XMM-Newton observations of the dwarf nova YZ Cnc in quiescence
Pasi Hakala, Gavin Ramsay, Peter Wheatley +2
We present results from the XMM observations of the dwarf nova YZ Cnc in a quiescent state. We have performed a detailed time series analysis of the resulting light curves. Unusual…
XMM-Newton observations of polars in low accretion states
Gavin Ramsay, Mark Cropper, Kinwah Wu +3
We have made a series of snap-shot observations of 37 polars using XMM-Newton. We found that 16 of these systems were in a low, or much reduced, accretion state. Of those, 6 were n…
XMM-Newton EPIC & OM observations of Her X-1 over the 35 day beat period
Silvia Zane, Gavin Ramsay, Mario A. Jimenez-Garate +2
We present the results of a series of XMM-Newton EPIC and OM observations of Her X-1, spread over a wide range of the 35 day precession period. We confirm that the spin modulation…