ACDS V10.0 - Detailed Description of II/207A

ACDS V10.0 - Sun Jan 19 17:09:30 CET 2025

| # Detailed Description of II/207A : Palomar-Green catalog UV-excess stellar objects (Green+ 1986) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    II/207A           Palomar-Green catalog UV-excess stellar objects  (Green+ 1986)
    ================================================================================
    The Palomar-Green catalog of ultraviolet-excess stellar objects.
         Green R.F., Schmidt M., Liebert J.
        <Astrophys. J. Suppl. Ser. 61, 305 (1986)>
        =1986ApJS...61..305G
    ================================================================================
    ADC_Keywords: Ultraviolet ; Photometry, UBV ; Photometry, uvby ; Blue objects

    Keywords: photometry - quasars - stars: faint blue -
              stars: spectral classification - stars: stellar statistics -
              stars: subdwarfs - stars: white dwarfs

    Description:
        The Palomar-Green Catalogue of UV-excess stellar objects provides
        positions accurate to about 8arcsec in each coordinate, photographic
        B-magnitudes accurate to 0.29mag, spectral types, some
        cross-references, and photoelectric broad-band, multichannel, and
        Stroemgren colors when available.

        Of the 1874 objects in the catalogue as published in 1986 (1878 in
        this version), 1715 comprise a statistically complete sample covering
        10714 square degrees from 266 fields taken on the Palomar 18-inch
        Schmidt telescope. Limiting magnitudes vary from field to field,
        ranging from 15.49 to 16.67. The overall completeness is estimated to
        be 84%, but that figure and the relative contributions of magnitude,
        color, and accidental errors vary depending on the magnitude and color
        distribution of the spectroscopic subsample.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × catalog.dat      144     1878  *Palomar-Green Survey Data (Table 5)
    × pg_pos.dat       135     1878  *Accurate positions by B. Skiff
    × pg_2009.txt       80      157   Short history of "pg_pos.dat" file.

    Note on catalog.dat: it may differ slightly from the published version as
         updates have been incorporated by the authors as new information
         became available.
    Note on pg_pos.dat: file added in April 2009, from B. Skiff; more details
         in the "History" section below, and in the file "II/207A/pg2009.txt|pg2009.txt>".

    See also:
        II/223 :  First Byurakan Survey (FBS), 2nd Program (Abrahamian et al., 1996)
        J/AJ/111/645 : Morphology of Bright Quasars of this list (Fabian+ 1996)
      J/A+A/250/370 : Far-UV excess object survey (Bixler+ 1991)
      J/ApJS/156/47 : DA white dwarfs from the Palomar Green Survey (Liebert+, 2005)

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

       Bytes Format Units   Label     Explanations

       1-  2  A2    ---     ---       [PG]
       4- 12  A9    ---     PG        PG name (1)
      14- 15  I2    h       RA50h     Published Right Ascension 1950 (hours)
      17- 18  I2    min     RA50m     Published Right Ascension 1950 (minutes)
      20- 23  F4.1  s       RA50s     Published Right Ascension 1950 (seconds)
          25  A1    ---     DE50-     Published Declination 1950 (sign)
      26- 27  I2    deg     DE50d     Published Declination 1950 (degrees)
      29- 30  I2    arcmin  DE50m     Published Declination 1950 (minutes)
      32- 33  I2    arcsec  DE50s     Published Declination 1950 (seconds)
      36- 40  F5.2  mag     Pmag      Photographic magnitude, accuracy 0.29mag
      43- 47  F5.2  mag     Blim      []?=0. Limiting magnitude of field (2)
      50- 58  A9    ---     Comment   Other names, redshift or spectral type (3)
      60- 64  A5    ---     Class     Spectral classification
          66  A1    ---     n_Class   [*] a high dispersion spectrum exists
      68- 72  F5.2  mag     Bmag      ? Photoelectic Johnson's magnitude
          73  A1    ---     u_Bmag    Uncertainty flag (:) on Bmag
      74- 78  F5.2  mag     U-B       ? Photoelectic Johnson's colour index
          79  A1    ---     u_U-B     Uncertainty flag (:) on U-B
      80- 84  F5.2  mag     B-V       ? Photoelectic Johnson's colour index
      87- 91  F5.2  mag     vmag      ? Palomar photometric index (4)
          92  A1    ---     u_vmag    Uncertainty flag (:) on vmag
      93- 97  F5.2  mag     u-v       ? Palomar photometric index (4)
          98  A1    ---     u_u-v     Uncertainty flag (:) on u-v
      99-103  F5.2  mag     b-v       ? Palomar photometric index (4)
     105-109  F5.2  mag     g-r       ? Palomar photometric index (4)
         111  I1    ---     ---       ? Unexplained number
     114-118  F5.2  mag     Vmag      ? V magnitude in Stroemgren system (5)
     120-124  F5.2  mag     b-y       ? Colour in Stroemgren system (5)
         125  A1    ---     u_b-y     Uncertainty flag (:) on b-y
     126-130  F5.2  mag     u-b       ? Colour in Stroemgren system (5)
         131  A1    ---     u_u-b     Uncertainty flag (:) on u-b
     132-136  F5.2  mag     m1        ? Index  (v-b)-(b-y) in Stroemgren system (5)
     138-144  A7    ---     Refs      [0-9, ] References (6)

    Note (1): This name did not exist in the original table, but appear as a
         caption in the finding charts; it has been built from RAh, RAm, DE-,
         DEd and a digit representing the rounded part of DEm, checked against
         the name used in the finding charts; in a few cases a suffix was added
         in case of name collision (see details in the  "History" section below)
    Note (2): if the object was found in overlapping fields, Blim indicates
         the deeper exposure. A value of 0. means that the object is not
         part of the complete statistical sample, which can be due to
         faintness, undetection in automated scanning process, or presence
         in a field with abnormally bright Blim.
    Note (3): this column contains redshifts for extragalactic sources,
         spectral types for companions to the blue stars, and brief notes
         about spectral peculiarities or uncertainties. It contains also
         cross-identifications of the objects.
         For white dwarfs, see the McCook & Sion catalog III/129
         For PHL (Palomar-Haro-Luyten, 1962BITon...3...37H) see catalog III/74
          EG = Eggen and Greenstein (1965ApJ...141...83E, 1967ApJ...150..927E)
           T = Tonantzintla lists   (1957BOTT....2G...3I, 1959BOTT....2I...3C)
           U = Usher and collaborators (1981ApJS...46..117U, 1982ApJS...48...51U,
                 1982ApJS...49...27U, 1984ApJS...56..393H)
           K = Kiso UV survey
          PB = Palomar-Berger (1977A&AS...28..123B)
        L,LB = Luyten lists (Univ. Minnesota)
        G,GD = Giclas Proper Motion Survey (see cats. I/79, I/112)
           F = Feige (1958ApJ...128..267F)
          HZ = Humason-Zwicky (1947ApJ...105...85H)
        C,CB = Pesch & Sandyuleak (1983ApJS...51..171P, 1984ApJS...55..517S)
    Note (4): Palomar 5m multichannel spectrophotometric indices defined
        by Greenstein (1976ApJ...207L.119G) centered at
        u=2.80um-1, g=2.12um-1, v=2.12um-1, r=1.44um-1  (wavenumbers micron-1)
        and calibrated in the AB79 system by Oke & Gunn (1983ApJ...266..713O)
    Note (5): See a description of Stroemgren system in Geneva
        General Catalog of Photometric Data <GCPD/04>
    Note (6): The values without citations are based on the authors'
        measurements. Otherwise the numbers refer to the following papers:
          1 = Green              =1980ApJ...238..685G
          2 = Graham             =1972AJ.....77..144G
          3 = Greenstein         =1984ApJ...276..602G
          4 = Wegner             =1983AJ.....88..109W
          5 = Liebert & Stockman =1980PASP...92..657L
          6 = Wesemael et al.    =1985ApJS...58..379W
          7 = Bond et al.        =1984ApJ...279..751B
          8 = Ferguson et al.    =1981ApJ...251..205F
          9 = Margon et al.      =1981Natur.293..200M
         10 = Ferguson et al.    =1984ApJ...287..320F
         11 = Green et al.       =1982PASP...94..560G
         12 = Becker et al.      =1982MNRAS.201..265B
         13 = Penning et al.     =1984ApJ...276..233P
         14 = Liebert et al.     =1982ApJ...256..594L
         15 = Liebert et al.     =1984ApJ...277..692L
         16 = Liebert et al.     =1983ApJ...264..262L
         17 = Barker & Cudworth  =1984ApJ...278..610B
         18 = Schmidt & Green    =1983ApJ...269..352S
         19 = Weymann et al.     =1980Natur.285...64W
         20 = Ellis et al.       =1984PASP...96..283E
         21 = Sion et al.        =1985ApJ...292..477S
         22 = Sion et al.        =1985ApJ...292..471S
         23 = Szkody et al.      =1985ApJ...293..321S
         24 = McGraw et al.      =1979IAUCo..53..377M
         25 = Winget et al.      =1984IAUC.3932.....W
         26 = Winget et al.      =1984ApJ...279L..15W
         27 = Nather et al.      =1984IAUC.4021.....N
         28 = Green              =1976PASP...88..665G

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

       Bytes Format Units   Label     Explanations

       1-  2  A2    ---     ---       [PG]
       4- 12  A9    ---     PG        PG name, as in file "catalog.dat"
      16- 17  I2    h       RAh       Right Ascension J2000 (hours)
      19- 20  I2    min     RAm       Right Ascension J2000 (minutes)
      22- 26  F5.2  s       RAs       Right Ascension J2000 (seconds)
          28  A1    ---     DE-       Declination J2000 (sign)
      29- 30  I2    deg     DEd       Declination J2000 (degrees)
      32- 33  I2    arcmin  DEm       Declination J2000 (minutes)
      35- 38  F4.1  arcsec  DEs       ? Declination J2000 (seconds)
          40  A1    ---     s         [BbCgLMSsTU?-] Source of position (1)
      42- 45  F4.1  mag     Vmag1     ? V or U magnitude rounded to 0.1mag
                                        (blank for the 2 lost stars)
          47  A1    ---     n_Vmag1   [VU] Filter of Vmag1
      50- 58  A9    ---     Class1    Spectral classification, mainly from
                                         catalog.dat file.
      61-135  A75   ---     Comment1  cross-identifications and comments
                                      from B. Skiff

    Note (1): position sources as follows:
       b = USNO-B1.0  (2003AJ....125..984M, I/284)
       B = Bordeaux meridian circle  (2006A&A...448.1235D, I/300)
       C = Carlsberg meridian circle, CMC14  (I/304)
       g = GSC-2.3  (2006yCat.1305.....S, I/305)
       L = Lepine LSPM  (2005AJ....129.1483L, I/298)
       M = 2MASS    (2006AJ....131.1163S, II/246)
       S = SDSS DR6  (2008ApJS..175..297A, II/292)
       s = Skiff estimate ± 1"
       T = Tycho-2  (2000A&A...357..367H, I/259)
       U = UCAC2    (2004AJ....127.3043Z, I/289)
       - = "other", mostly VLBI ICRF sources (2004AJ....127.3587F, J/AJ/127/3587)
       ? = the two 'lost' sources

    Nomenclature Notes:
         PG : the name is based on 1950 position. The first list of
              PG objects was presented by Green R.F., Greenstein J.L.,
              and Boksenberg A.  (1976PASP...88..598G)

    Acknowledgements:
        Thanks to Richard Green (noao.edu) for supplying an electronic
        version of his catalogue to H. Andernach in March 1994

    History:
      * 26-Sep-1996: First version, from Richard Green via Heinz Andernach.
      * 17-Oct-1997: for PG 1535+547, in column "Comment", the cross-
        identification I Zw 120 changed to I Zw 121 (H. Andernach)
      * 30-Dec-2002: the PG names were checked against the names found
        in the finding charts of the publication; 3 PG names were corrected
        for PG 0149+137, PG 0900+401 and PG 0902+057
      * 14-Apr-2009 (version II/207A):
        file 'pos.dat' with precise coordinates and comments by Brian Skiff
        (Lowell Obs.); see the history of this new file in "II/207A/pg2009.txt|pg2009.txt>".
        In the main catalog, duplicate names corrected: second occurence of
        PG 2204+071 corrected into PG 2204+070, and a suffix (a or b) was
        added to PG 1012+008, PG 1536+097, and PG 1610+239.
      * 20-Aug-2016: position of PG 2239+043 recovered, fixed in file "pg_pos.dat"
    ================================================================================
    (End)    Heinz Andernach, Francois Ochsenbein, Brian Skiff           14-Apr-2009