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Despite the unique X-ray behavior of the compact bursting X-ray source MXB1730-335, the “Rapid Burster” (RB) in the highly reddened globular cluster Liller 1, to date there has been no known optical/IR counterpart for the object, no precise astrometric solution that correlates X-ray, radio, and optical positions and thus restricts the number of possible(More)
We have obtained exposures of the field of X 0512-401 in the globular cluster NGC1851, in X-rays with the Chandra X-ray Observatory, and in the far-UV with the Hubble Space Telescope. We derive an accurate new X-ray position (within ∼1) for X 0512-401, which enables us to confirm that the only plausible candidate for the optical/UV counterpart is the Star(More)
Center for Space Research and Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139-4307; davep@space.mit.edu, lewin@space.mit.edu, jmm@space.mit.edu Astronomy Department, Box 351580, University of Washington, Seattle, WA 98195; homer@astro.washington.edu, anderson@astro.washington.edu Astronomical Institute, Utrecht University,(More)
We report on the identification of the optical counterpart of the binary millisecond pulsar PSR J1911−5958A, located in the outskirts of the globular cluster NGC 6752. At the position of the pulsar we find an object with V = 22.08, B− V = 0.38, U − B = −0.49. The object is blue with respect to the cluster main sequence by 0.8 magnitudes in B − V . We argue(More)
We report follow-up observations of the Sloan Digital Sky Survey Cataclysmic Variable SDSS J210014.12+004446.0 (hereafter SDSS J2100). We obtained photometry and spectroscopy in both outburst and quiescent states, providing the first quiescent spectrum of this source. In both states, non-sinusoidal photometric modulations are apparent, suggestive of(More)
We describe further results of a program aimed to yield ∼10 fully characterized optical identifications of ROSAT X-ray sources. Our program employs X-ray data from the ROSAT All-Sky Survey (RASS), and both optical imaging and spectroscopic data from the Sloan Digital Sky Survey (SDSS). RASS/SDSS data from 5740 deg of sky spectroscopically covered in SDSS(More)
We report the results of a 45 ks Chandra observation of the cataclysmic variable V426 Ophiuchus. The high resolution spectrum from the high-energy transmission grating spectrometer is most consistent with a cooling flow model, placing V426 Oph among the group of CVs including U Gem and EX Hya. An uninterrupted lightcurve was also constructed, in which we(More)
This paper continues the series that identifies new cataclysmic variables found in the Sloan Digital Sky Survey. We present 36 cataclysmic variables and one possible symbiotic star from Sloan spectra obtained during 2002, of which 34 are new discoveries, 2 are known dwarf novae (BC UMa, KS UMa) and one is a known CV identified from the 2dF survey. The(More)