Jonathan Kemp

Superhumps in Cataclysmic Binaries. XXV. q_crit, epsilon(q), and Mass-Radius (2005)

Patterson, Joseph, Kemp, Jonathan, Harvey, David, Fried, Robert, Rea, Robert, Monard, Berto, ...

We report on successes and failures in searching for positive superhumps in cataclysmic variables, and show the superhumping fraction as a function of orbital period. Basically, all short-period...

Wideband measurement of the acoustic impedance of tubular objects (2005)

Van Walstijn, Maarten, Cambell, Murray, Kemp, Jonathan, Sharp, David

A method is discussed for measuring the acoustic impedance of tubular objects that gives accurate results for a wide range of frequencies. The apparatus that is employed is similar to that used in...

Pulsations, Boundary Layers, and Period Bounce in the Cataclysmic Variable RE J1255+266 (2005)

Patterson, Joseph, Thorstensen, John, Kemp, Jonathan

We report time-series photometry of the quiescent optical counterpart of the EUV transient RE J1255+266. The star appears as a DA white dwarf with bright emission lines and a complex spectrum of...

Rapid Oscillations in Cataclysmic Variables. XVI. DW Cancri (2004)

Patterson, Joseph, Thorstensen, John, Vanmunster, Tonny, Fried, Robert, Martin, Brian, Campbell, Tut, ...

We report photometry and spectroscopy of the novalike variable DW Cancri. The spectra show the usual broad H and He emission lines, with an excitation and continuum slope characteristic of a...

Rapid Oscillations in Cataclysmic Variables. XV. HT Camelopardalis (= RX J0757.0+6306) (2002)

Kemp, Jonathan, Patterson, Joseph, Thorstensen, John, Fried, Robert, Skillman, David, Billings, Gary

We present photometry and spectroscopy of HT Camelopardalis, a recently discovered X-ray-bright cataclysmic variable. The spectrum shows bright lines of H, He I, and He II, all moving with a period...

Superhumps in Cataclysmic Binaries. XXII. 1RXS J232953.9+062814 (2002)

Skillman, David, Krajci, Thomas, Beshore, Edward, Patterson, Joseph, Kemp, Jonathan, Starkey, Donn, ...

We report photometry of 1RXS J232953.9+062814, a recently discovered dwarf nova with a remarkably short 64.2-minute orbital period. In quiescence, the star's light curve is that of a double sinusoid,...

1RXS J232953.9+062814: A Dwarf Nova with a 64-minute Orbital Period and a Conspicuous Secondary Star (2002)

Thorstensen, John R., Fenton, William H., Patterson, Joseph O., Kemp, Jonathan, Krajci, Thomas, Baraffe, Isabelle

We present spectroscopy and time-series photometry of the newly discovered dwarf nova 1RXS J232953.9+062814. Photometry in superoutburst reveals a superhump with a period of 66.06(6) minutes. The low...

Outbursts of EX Hydrae: mass-transfer events or disc instabilities? (2000)

Hellier, Coel, Kemp, Jonathan, Naylor, T., Bateson, Frank M., Jones, Albert, Overbeek, Danie, ...

We present the 45-yr record of EX Hya's lightcurve and discuss the characteristics of its 15 observed outbursts. We then concentrate on the 1998 outburst, reporting the first outburst X-ray...

XTE J2123-058: A New Neutron Star X-Ray Transient (1999)

Tomsick, John A., Halpern, Jules P., Kemp, Jonathan, Kaaret, Philip

We report on optical and RXTE observations of a new high-latitude bursting X-ray transient, XTE J2123-058. We identified the optical counterpart, measured the 5.9573 hr orbital period and constrained...