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J/ApJS/123/639      UBV photometry of metal-weak candidates  (Norris+, 1999)
A search for stars of very low metal abundance. III.
UBV photometry of metal-weak candidates.
    Norris J.E., Ryan S.G., Beers T.C.
   <Astrophys. J. Suppl. Ser. 123, 639 (1999)>
   =1999ApJS..123..639N
ADC_Keywords: Photometry, UBV ; Stars, peculiar ; Stars, population II

Keywords: catalogs - stars: abundances - stars: Population II - surveys


Abstract:
    We present photoelectric UBV photometry for some 2600 metal-poor dwarf
    and giant candidates selected from the HK
    objective-prism/interference-filter survey of Beers and colleagues.
    These data provide the basis for our ultraviolet-excess selection of
    objects having [Fe/H]≲-2.0 for a spectroscopic investigation in which
    we have obtained ∼1-2Å resolution spectra of some 1000 objects. The
    present material may also prove useful for investigations of the
    metal-poor dwarfs and giants more metal-rich than [Fe/H]=-2.0, as well
    as the misclassified subdwarf O and B stars, white dwarfs, blue
    metal-poor stars, and field horizontal-branch stars which appear in
    the catalog.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        55     2086   UBV photometry for metal-weak candidates
table3.dat        55      549   Less accurate UBV photometry for fainter
                             metal-weak candidates
table4.dat        33       94   Multiple identifications in HK objective
                             prism survey (centered on H & K lines of CaII)


See also:
  J/AJ/87/1515    : UBV photometry of AB stars in halo (Pier, 1982)
  J/ApJS/53/791   : Spectroscopy of AB stars in halo (Pier, 1983)
  J/AJ/90/2089    : Stars of very low metal abundance. (Beers+, 1985)
  J/PASP/102/1392 : UBV photometry from HK survey. (Doinidis+ 1990)
  J/PASP/103/973  : Photoelectric UBV from HK survey. (Doidinis+ 1991)
  J/ApJS/76/1001  : UBV photometry of HK survey stars (Preston+, 1991)
  J/AJ/103/267    : Spectrocopy of hot stars in galactic halo (Beers+ 1992)
  J/AJ/103/1987   : Stars of very low metal abundance (Beers+ 1992)
  J/AJ/108/268    : HK survey emission-line candidates positions (Beers+ 1994)
  J/AJ/108/538    : Metal-poor MS stars UBV photometry (Preston+ 1994)
  J/AJ/112/1188   : HK survey emission-line candidates (Beers+ 1996)
  J/AJ/117/2329   : Spectroscopy of hot stars in the halo. (Wilhelm+, 1999)


Table 1 : External error estimates of photometric errors
--------------------------------------------------------------------------
 Comparison                   <D(V)>   <D(B-V)>   <D(U-B)>   NB,V NU
 Source                      s[D(V)]  s[D(B-V)]  s[D(U-B)]
--------------------------------------------------------------------------
 Carney et al., 1994          -0.040   +0.030     +0.020        1     1
    Cat. J/AJ/107/2240        ...      ...        ...
 Ryan, 1989                   +0.001   +0.011     +0.000        7     6
    Cat. J/AJ/98/1693        0.020    0.016      0.020
 Other HK investigations      -0.002   -0.013     +0.003       13     9
                               0.044    0.019      0.031
--------------------------------------------------------------------------
 Note: D: Differences in the sense (Other work - This work)
       s: Dispersion of difference

Byte-by-byte Description of file: table2.dat table3.dat

   Bytes Format Units   Label     Explanations

   1- 12  A12   ---     BPS       BPS star designation
      13  A1    ---     n_BPS     [*] when identifications in file table4.dat
  14- 15  I2    h       RAh       Right ascension (1950.0)
  17- 18  I2    min     RAm       Right ascension (1950.0)
  20- 23  F4.1  s       RAs       Right ascension (1950.0)
      25  A1    ---     DE-       Declination sign (1950.0)
  26- 27  I2    deg     DEd       Declination sign (1950.0)
  29- 30  I2    arcmin  DEm       Declination (1950.0)
  32- 33  I2    arcsec  DEs       Declination (1950.0)
  35- 39  F5.2  mag     Vmag      Johnson V magnitude
  41- 45  F5.2  mag     B-V       Johnson B-V colour index
  47- 51  F5.2  mag     U-B       ? Johnson U-B colour index
      53  I1    ---     Nv        ? Number of V and B-V measures
      54  I1    ---     Nu        Number of U-B determinations
      55  A1    ---     Note      [*] Stars for which we have obtained medium-
                              resolution spectroscopy and which form the basis
                              of the work of Norris et al. (1999, AJ, in prep.)


Byte-by-byte Description of file: table4.dat

   Bytes Format Units  Label   Explanations

   1- 12  A12   ---    BPS     Identification from tables 2 and 3
  14- 22  A9    ----   Star2   Identification from other fields (1)
  24- 32  A9    ---    Star3   Identification from other fields (1)

Note (1): Not necessarily observed in this work



History: From AAS Electronic Version

(End)                                         Patricia Bauer  [CDS]  23-Mar-2000