Proper‐Motion Catalog from SDSS ∩ USNO‐B | Zendy

Andrew Gould | Zendy; Juna A. Kollmeier | Zendy

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Proper‐Motion Catalog from SDSS ∩ USNO‐B

Author(s) -

Andrew Gould,

Juna A. Kollmeier

Publication year - 2004

Publication title -

the astrophysical journal supplement series

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.546

H-Index - 277

eISSN - 1538-4365

pISSN - 0067-0049

DOI - 10.1086/382529

Subject(s) - spurious relationship , proper motion , physics , stars , astrometry , systematic error , astrophysics , intersection (aeronautics) , motion (physics) , sigma , observatory , astronomy , statistics , mathematics , classical mechanics , geography , cartography

We present a catalog of 345,000 stars with proper motions \mu > 20 mas/yr andmagnitudes r' <20, drawn from the intersection of the SDSS Data Release One andUSNO-B. We first use SDSS quasars to correct the proper motions in each of thetwo source catalogs, finding that these corrections for systematics arecomparable to the statistical errors. The combined proper motions have errorsof \sigma_\mu=4.0 mas/yr, significantly better than any previous catalog atthese magnitudes. While cross-correlating SDSS and USNO-B removes the vastmajority of the very large number of spurious proper-motion stars in each, somecontamination remains, especially at faint magnitudes, r' > 19.5, and highproper motions. We present a diagrammatic method to estimate the level ofcontamination in selected subsets of the catalog, which should be useful forchoosing appropriate selection criteria for various applications.

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