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

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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)
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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
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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