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astro-ph2007
Finding Periods in High Mass X-Ray Binaries
Gordon E. Sarty, Laszlo L. Kiss, Helen M. Johnston +2
This is a call for amateur astronomers who have the equipment and experience for producing high quality photometry to contribute to a program of finding periods in the optical ligh…
astro-ph2000
Multiple and variable X-ray sources in the globular clusters omega Cen, NGC6397, NGC6752, and Liller 1
Frank Verbunt, Helen M. Johnston
We detect stars from the Hipparcos and Tycho Catalogues in the field of view of observations with the ROSAT HRI of three globular clusters. We use the positions of these stars to r…