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J/ApJS/76/1001          UBV photometry of HK survey stars     (Preston+, 1991)
Photoelectric UBV photometry of stars selected in the HK objective-prism survey
     Preston G.W., Shectman S.A., Beers T.C.
    <Astrophys. J. Suppl. Ser. 76, 1001 (1991)>
    =1991ApJS...76.1001P
ADC_Keywords: Photometry, UBV ; Stars, metal-deficient ; Stars, halo

Keywords: photometry - stars: horizontal branch - stars: weak-line


Abstract:
    Photoelectric UBV observations of  1782  stars  are  used  to  explore
    properties of  the  HK  objective-prism  survey  conducted  by  Beers,
    Preston, and  Shectman with the Curtis-Schmidt  telescope of the Cerro
    Tololo Inter-American  Observatory. We  construct an  intrinsic (U-B)0
    versus  (B-V)0 relation for blue horizontal branch stars and use it to
    derive estimates  of  E(B-V)  color  excesses  in  50  survey  fields.
    Comparison of these  with the  reddening maps  of Burstein  and Heiles
    indicates good agreement except  in  low-latitude  fields  toward  the
    Galactic bulge.  We  describe  qualitative  features  of  the  stellar
    content of  the HK survey by use  of unreddened two-color diagrams and
    indicate  how  the  photometric  data  may  prove  useful  in  several
    applications. Finally, we  use a  halo density  model to  estimate the
    variation of  completeness with apparent magnitude,  B, in our catalog
    of field horizontal branch star candidates.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        57     1305   Data for BHB candidates
table4.dat        57      372   Data for metal-poor candidates
table5.dat        57      102   Data for stars with ambiguous HK survey
                             spectral classes


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/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)
 J/ApJS/123/639  : UBV photometry of metal-weak candidates (Norris+, 1999)


Byte-by-byte Description of file: table3.dat table4.dat table5.dat

   Bytes Format  Units   Label    Explanations

   1- 10  A10    ---     BPS-CS   Curtis-Schmidt field number
      11  A1     ---    m_BPS-CS  Multiplicative index on star name
  13- 17  A5     ---     Sp       Catalog spectral class (MP=meta-poor)
  19- 23  F5.2   mag     Vmag     V magnitude
  25- 30  F6.3   mag     B-V      B-V colour index
  32- 37  F6.3   mag     U-B      []? U-B colour index
  39- 43  F5.1   deg     GLON     Galactic longitude
  45- 49  F5.1   deg     GLAT     Galactic latitude
  51- 54  A4     ---     Code     Code for observation period and telescope (1)
  56- 57  A2     ---     Note     Note about the star (2)

Note (1): The codes are:
      a = Observed in 1987-1989 at 2.5m telescope by G. Preston
      b = Observed in 1987-1989 at 1.0m telescope by G. Preston
      c = Observed prior to 1985 at 1.0m telescope by G. Preston
      d = Observed prior to 1985 at 1.0m telescope by J.Pier
      Multiple observations are indicated by digits that follow code letters
Note (2): The codes are related to the following remarks:
      1 = star was used to derive BHB intrinsic two-color relation
      2 = star has optical companion within 10"
      3 = variable? Star seemed too faint at time of observation
      4 = star is regarded as variable on basis of standard deviations
         in V and B-V
      5 = star 12a is NW member of pair, stars 12b is SE member of pair
     RR = RR Lyrae


References:
   Beer T.C., Preston G.W., and Shectman S.A. =1985AJ.....90.2089B
   Beer T.C., Preston G.W., and Shectman S.A. =1988ApJS...67..461B
   Burstein D. and Heiles C.,                 =1982AJ.....87.1165B

Historical notes: Keypunched at CDS

(End)                               Simona Mei, Patricia Bauer [CDS] 30-Jan-1995