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J/AJ/106/591      OP Survey of Halo early-type stars             (Rodgers+ 1993)
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Early-type stars in orthogonal halo fields. I. An objective-prism survey
     Rodgers A.W., Roberts W.H., Walker I.
    <Astron. J. 106, 591 (1993)>
    =1993AJ....106..591R
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ADC_Keywords: Surveys; Stars, early-type; Spectroscopy; Spectral types

Abstract:
    The results are reported of an objective-prism survey of stars, mostly
    earlier than spectral type F5, for two fields at
    (l;b) = (90 deg and 270 deg; -45 deg). The fields, each of approximately
    70 square degrees, are examined on plates taken with the Schmidt Telescope
    of the Anglo-Australian Observatory. The brightness range of the stars
    classified is 10 < V < 15. The prism combination used provides a
    dispersion of 600 A/mm at Hgamma. The spectral classification
    presented is defined by the equality of equivalent widths of Ca II K
    and Hdelta at type "F0" and the absence of Ca II K in stars with
    significant Balmer lines at type "A0". Positions listed in the catalog
    were measured on the Stromlo PDS microdensitometer. Most stars were
    subsequently identified with objects in the ST ScI-NASA-ESO Hubble
    Space Telescope Guide Star Catalog in which positions have an accuracy
    of near +/- 1.0 arcsec.

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table2          85        435    Catalog of early-type stars
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See also:
    J/AJ/106/1839 : Metal-rich halo A stars (Paper II.) (Rodgers+ 1993)

Byte-by-byte Description of file: table2
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   Bytes Format  Units   Label    Explanations
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   1-  9  A9     ---     Object   Object identifier
  12- 13  I2     h       RAh      Right Ascension J2000.0
  15- 16  I2     min     RAm      Right Ascension J2000.0
  18- 22  F5.2   s       RAs      Right Ascension J2000.0
      24  A1     ---     DE-      Declination sign
  25- 26  I2     deg     DEd      Declination J2000.0
  28- 29  I2     arcmin  DEm      Declination J2000.0
  31- 34  F4.1   arcsec  DEs      Declination J2000.0
  37- 43  A7     ---     Sp       Spectral type
  44- 48  F5.1   mag     Vmag     magnitude
  50- 85  A36    ---     Comment  Comments and other designations
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Note:
    This table contains the results of the spectral classification discussed in
    detail in section 3 of the printed paper. Twelve objective prism plates with
    a prism giving a dispersion of 600 A/mm at Hgamma were obtained on request
    by the staff of the Schmidt Telescope Unit of the Anglo-Australian
    Observatory. The plates were examined visually with a low power microscope
    and the spectra classified by A.W. Rodgers.
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Origin: AAS CD-ROM series, Volume 1, 1993

References:
   Rodgers A.W. & Roberts W.H., Paper III.   =1993AJ....106.2294R
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(End)                                         Patricia Bauer [CDS]   27-Jun-1994