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J/MNRAS/238/709     NPG stars VIJHK photometry (Stobie+ 1989)
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Distance errors and the stellar luminosity function
       Stobie R.S., Ishida K., Peacock J.A.
      <Mon. Not. R. Astron. Soc. 238, 709 (1989)>
      =1989MNRAS.238..709S      (SIMBAD/NED BibCode)
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ADC_Keywords: Photometry ; Stars, distances

Abstract:
    A study of the stellar luminosity function in the region of the north
    galactic pole (NPG) is described. The method is based on photometric
    parallaxes derived from the V-I colour index. A complete sample of
    stars is defined with I<16, V>13, V-I>1.5 and within 130pc of the Sun.
    JHK photometry is obtained for stars with V-I>2.9 to check the V-I
    calibration and exclude contamination by giants. It is demonstrated
    that application of the classical Malmquist bias derives an incorrect
    luminosity function. A detailed discussion is given of the effects of
    Malmquist-type biases on luminosity functions and a method presented
    which effectively deconvolves the observed luminosity function to
    determine the intrinsic luminosity function. The method is applied to
    the data in the north galactic pole sample. The derived main sequence
    luminosity function is in good agreement with other determinations
    based on the method of photometric parallaxes, showing a clear peak at
    M_v_~+11.5 to +12 and a well-defined decrease thereafter to M_v_=+15.
    Fainter than M_v_=+15, the luminosity function is not defined by the
    present study.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
appena             53      178   List of North Galactic Pole (NGP) stars within
                                  130 pc of the Sun
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Byte-by-byte Description of file: appena
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    h       RAh       Right ascension (1950)
   4-  5  I2    min     RAm       Right ascension (1950)
   7- 10  F4.1  s       RAs       Right ascension (1950)
      12  A1    ---     DE-       Declination sign
  13- 14  I2    deg     DEd       DEclination (1950)
  16- 17  I2    arcmin  DEm       DEclination (1950)
  19- 20  I2    arcsec  DEs       DEclination (1950)
  22- 26  F5.2  mag     Vmag      V magnitude
  28- 32  F5.2  mag     Imag      I magnitude
  34- 37  F4.2  mag     V-I       V-I colour index
  39- 43  F5.2  mag     Kmag      ? K magnitude
  45- 48  F4.2  mag     J-K       ? J-K colour index
  50- 53  F4.2  mag     H-K       ? H-K colour index
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History: Prepared via OCR at CDS.
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(End)                       Marie-Jose Wagner, Patricia Bauer [CDS]  29-Apr-1997