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The optical counterparts of the luminous x-ray binary stars in globular clusters
Ten percent of our Galaxy's luminous (LX≳1036 ergs-1 ) X-ray point sources are located in globular clusters (GCs), but globular clusters contribute a much smaller fraction of normal stars to the Galaxy. X-ray bursts have been observed from nearly all of them, indicating that these sources are low-mass X-ray binary (LMXB) ...
The composition of near-earth objects
I present reflectance spectra of 34 near-Earth objects (NEOs), 6 main-belt asteroids, and four non-NEO cometary candidates, all obtained with the Apache Point Observatory 3.5m telescope + Double Imaging Spectrograph. The spectra cover the wavelength range 3800-10,000 A, encompassing regions of mineralogically important ...
The formation and evolution of the large magellanic cloud from selected clusters and star fields
We have obtained deep Hubble Space Telescope color-magnitude diagrams of fields centered on the six old LMC globular clusters NGC 1754, NGC 1835, WGC 1898, NGC 1916, NGC 2005, and NGC 2019. The data have been carefully calibrated and the effects of crowding on the photometric accuracy have been thoroughly investigated. The ...