Improved Astrometry and Photometry for the Luyten Catalog. I. Bright Stars | Zendy

Andrew Gould | Zendy; Samir Salim | Zendy

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Improved Astrometry and Photometry for the Luyten Catalog. I. Bright Stars

Author(s) -

Andrew Gould,

Samir Salim

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/344818

Subject(s) - astrometry , stars , physics , photometry (optics) , astrophysics , milky way , galactic plane , sky , astronomy , proper motion

We outline the construction of an updated version of the New LuytenTwo-Tenths (NLTT) catalog of high proper motion stars, which will containimproved astrometry and photometry for the vast majority of the ~59,000 starsin NLTT. The bright end is constructed by matching NLTT stars to Hipparcos,Tycho-2, and Starnet; the faint end by matching to USNO-A and 2MASS. In thisfirst paper, we detail the bright-end matching procedure. We show that for themajority of stars in his catalog, Luyten measured positions accurate to 1" eventhough he recorded his results much more coarsely. However, there is a longtail of position errors, with one error as large as 11 deg. Proper-motionerrors for the stars with small position errors are 24 mas/yr (1 sigma) butdeteriorate to 34 mas/yr for stars with inferior positions. NLTT is virtually100% complete for V<11.5 and |b|>15 deg, but completeness in this magnituderange falls to about 75% at the Galactic plane. Incompleteness near the planeis not uniform, but is rather concentrated in the interval -80

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