122 citations · 3.4k across the 145 of their papers we have counts for
4 papers · 1 filter
KIC 10449976: discovery of an extreme-helium subdwarf in the Kepler field
C. S. Jeffery, G. Ramsay, N. Naslim +6
Optical spectroscopy of the blue star KIC 10449976 shows that it is an extremely helium-rich subdwarf with effective temperature T=40000+/-300 K and surface gravity log g=5.3+/-0.1…
LOFT: the Large Observatory For X-ray Timing
M. Feroci, J. W. den Herder, E. Bozzo +245
The LOFT mission concept is one of four candidates selected by ESA for the M3 launch opportunity as Medium Size missions of the Cosmic Vision programme. The launch window is curren…
Kepler Observations of V447 Lyr: An Eclipsing U Gem Cataclysmic Variable
Gavin Ramsay, John K. Cannizzo, Steve B. Howell +4
We present the results of an analysis of data covering 1.5 years of the dwarf nova V447 Lyr. We detect eclipses of the accretion disk by the mass donating secondary star every 3.74…
Suppression of X-rays during an optical outburst of the helium dwarf nova KL Dra
Gavin Ramsay, Peter J. Wheatley, Simon Rosen +2
KL Dra is a helium accreting AM CVn binary system with an orbital period close to 25 mins. Approximately every 60 days there is a 4 mag optical outburst lasting ~10 days. We presen…