Astrometry with the MACHO data archive. I. High proper motion stars toward the Galactic bulge and Magellanic Clouds

C. Alcock, R.A. Allsman, D.R. Alves, T.S. Axelrod, A.C. Becker, D.P. Bennett, K.H. Cook, A.J. Drake, K.C. Freeman, M. Geha, K. Griest, M.J. Lehner, S.L. Marshall, D. Minniti, C.A. Nelson, B.A. Peterson, P. Popowski, M.R. Pratt, Peter Quinn, C.W. Stubbs & 3 others W. Sutherland, T. Vandehei, D.L. Welch

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    Abstract

    We present the preliminary results of our astrometric study of stellar motions along the lines of sight of the Magellanic Clouds and the Galactic bulge. Using 5 years of MACHO project point-spread function photometry, we find that we can easily select stars with proper motions of 0."03 yr(-1) from these very dense fields, using the characteristic shapes of their light curves. By performing astrometry on photometrically selected, candidate, high proper motion (HPM) stars in 50 deg(2), we have discovered 154 new HPM stars from similar to 55 million stars monitored by the MACHO project. These new objects have proper motions as high as 0."5 yr(-1), brightnesses ranging from V similar to 13 to V similar to 19, and V - R colors between 0.3 and 1.45.
    Original languageEnglish
    Pages (from-to)337-347
    JournalAstrophysical Journal
    Volume562
    Issue number1
    DOIs
    Publication statusPublished - 2001

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    Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., ... Welch, D. L. (2001). Astrometry with the MACHO data archive. I. High proper motion stars toward the Galactic bulge and Magellanic Clouds. Astrophysical Journal, 562(1), 337-347. https://doi.org/10.1086/323438