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J/AJ/104/28     JHKL photometry of BL Lac Objects   (Bersanelli+ 1992)
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Homogeneous JHKL photometry of a sample of BL Lac Objects
     Bersanelli M., Bouchet P., Falomo R., Tanzi E.G.
    <Astron. J. 104, 28 (1992)>
    =1992AJ....104...28B
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ADC_Keywords: BL Lac objects; Photometry, infrared

Description:
    Homogeneous J, H, K, L, photometry of 42 BL Lacertae objects is
    presented. The observations cover a period of 3 yr with a typical
    time interval of 6 months.

File Summary:
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 FileName      Lrecl   Records    Explanations
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ReadMe            80         .    This file
table1.dat        76        42    Program Objects
table2.dat        68       135    JHKL Fluxes
table3.dat        52        42    Spectral indices
refs.dat          73        42    References
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Byte-by-byte Description of file: table1.dat
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   Bytes Format  Units   Label    Explanations
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   1-  8  A8     ---     Name     BL Lac name
  10- 11  I2     h       RAh      Right Ascension J2000 (hours) (1)
  13- 14  I2     min     RAm      Right Ascension J2000 (minutes) (1)
  16- 19  F4.1   s       RAs      Right Ascension J2000 (seconds) (1)
      21  A1     ---     DE-      Declination J2000 (sign) (1)
  22- 23  I2     deg     DEd      Declination J2000 (degrees) (1)
  25- 26  I2     arcmin  DEm      Declination J2000 (minutes) (1)
  28- 29  I2     arcsec  DEs      Declination J2000 (seconds) (1)
  31- 35  F5.3   ---     z        ? Redshift
  39- 42  F4.2   mag     Av       Absorption
      47  A1     ---     X/R      X or Radio flag
  49- 67  A19    ---    Comments  Free-text comments
  69- 76  A8     ---  r_Comments  Comma-separated list of references
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Note (1): position added from SIMBAD data-base
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Byte-by-byte Description of file: table2.dat
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   Bytes Format  Units   Label    Explanations
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   1-  8  A8     ---     Name     BL Lac name
  10- 20  F11.3  JD      JD       Julian Date of observation
  22- 26  F5.2   mJy     Jmag     ? Flux in filter
  28- 32  F5.2   mJy   e_Jmag     ? mean error on J
  34- 38  F5.2   mJy     Hmag     ? Flux in filter
  40- 44  F5.2   mJy   e_Hmag     ? mean error on H
  46- 50  F5.2   mJy     Kmag     ? Flux in filter
  52- 56  F5.2   mJy   e_Kmag     ? mean error on K
  58- 62  F5.2   mJy     Lmag     ? Flux in filter
  64- 68  F5.2   mJy   e_Lmag     ? mean error on L
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Byte-by-byte Description of file: table3.dat
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   Bytes Format  Units   Label    Explanations
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   1-  8  A8     ---     Name     BL Lac name
      10  A1     ---     Note     Notes (1)
  13- 17  F5.2   ---     Sp-Index ? spectral index (F proportional (nu)**(-a)
  20- 21  I2     ---     Nobs     Number of observations
  23- 27  F5.2   ---     amin     ? Minimal value of spectral index
  30- 33  F4.2   ---   e_amin     ? mean error on amin
  35- 39  F5.2   ---     amax     ? Maximal value of spectral index
  43- 46  F4.2   ---   e_amax     ? mean error on amax
  50- 52  I3     %       pcGal    ? Fractional estimated flux contribution of
                                   the host galaxy to the observed spectrum.
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Note (1):
   a) Near a bright star
   b) Significant positive curvature
   c) Spectral index is derived after subtraction of the thermal component
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Byte-by-byte Description of file: refs.dat
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   Bytes Format Units   Label     Explanations
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   2-  3  I2    ---     RefNum    Reference number
   5- 23  A19   ---     BibCode   The 19-digit bibcode, when existing
  25- 74  A50   ---     Text      Authors
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History:
  * 19-Mar-1993: Tables received from Marco Bersanelli
  * 11-Apr-2000: Added file refs.dat
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(End)                                    Francois Ochsenbein [CDS]   11-Apr-2000