ACDS V10.0 - Detailed Description of V/70A

ACDS V10.0 - Sun Jan 19 14:41:52 CET 2025

| # Detailed Description of V/70A : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991) |

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.

    V/70A               Nearby Stars, Preliminary 3rd Version  (Gliese+ 1991)
    ================================================================================
    Preliminary Version of the Third Catalogue of Nearby Stars
         GLIESE W., JAHREISS H.
        <Astron. Rechen-Institut, Heidelberg (1991)>
    ================================================================================
    ADC_Keywords: Stars, nearby

    Description:
        The present version of the CNS3 contains all known stars within
        25 parsecs of the Sun. It depends mainly on a preliminary version
        (Spring 1989) of the new General Catalogue of Trigonometric
        Parallaxes (YPC) prepared by Dr. William F. van Altena (Yale
        University).

        The catalogue contains every star with trigonometric parallax
        greater than or equal to 0.0390 arcsec, even though it may be
        evident from photometry or for other reasons that the star has a
        larger distance. For red dwarf stars, new color-magnitude
        calibrations for broad-band colors were carried out and applied.
        For white dwarfs, the recipes of McCook and Sion were applied
        (=1985ApJS...65..603M). Stroemgren photometry was used (not yet
        systematically) for early-type stars and for late dwarfs, the
        latter supplied by E. H. Olsen from Copenhagen Observatory
        (private communication).

        Contrary to the CNS2 (Gliese 1969) trigonometric parallaxes
        and photometric or spectroscopic parallaxes were not combined.
        The resulting parallax in the present version is always the
        trigonometric parallax -- if the relative error of the
        trigonometric parallax is smaller than 14 percent. The resulting
        parallax is the photometric or spectroscopic parallax only if no
        trigonometric parallax is available or if the standard error of
        the trigonometric parallax is considerably larger.

    Nomenclature Note:
        All new nearby stars have not been numbered, and only "NN" appears in
        the column "Name". There are therefore problems to designate these new
        stars, as e.g. in Reference =1994ApJS...93..287W . It is recommended
        for such stars to use one of the alternate designations from columns
        "Giclas", "LHS", "OtherName" or "Remarks".
        NOTE ADDED IN DECEMBER 1997: However, the usage found in the
        literature led to add a number for these "NN" stars,
        starting from 3001 (for star #2), 3002 (for star #4), etc,
        and ending with NN 4388.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × catalog.dat      257     3803   The Catalogue

    See also:
        III/198 : Palomar/MSU nearby star spectroscopic survey  (Hawley+ 1997)

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

       Bytes Format  Units   Label    Explanations

       1-  8  A8     ---     Name    *Identifier ; see remarks.
       9- 10  A2     ---     Comp     Components (A,B,C,... )
          11  A1     ---     DistRel *[pqsx] Reliability of the distance
      13- 14  I2     h       RAh      ? Right Ascension B1950 (hours)
      16- 17  I2     min     RAm      ? Right Ascension B1950 (minutes)
      19- 20  I2     s       RAs      ? Right Ascension B1950 (seconds)
          22  A1     ---     DE-      Declination B1950 (sign)
      23- 24  I2     deg     DEd      ? Declination B1950 (degrees)
      26- 29  F4.1   arcmin  DEm      ? Declination B1950 (minutes)
      31- 36  F6.3 arcsec/yr pm       ? Total proper motion
          37  A1     ---     u_pm     Uncertainty flag (:) on pm
      38- 42  F5.1   deg     pmPA     ? Direction angle of proper motion
      44- 49  F6.1   km/s    RV       ? Radial velocity
      51- 53  A3     ---     n_RV    *Remark on RV
      55- 66  A12    ---     Sp       Spectral type or color class
          67  A1     ---     r_Sp    *Selected sources
      68- 73  F6.2   mag     Vmag     Apparent magnitude
          74  A1     ---     r_Vmag  *Note on origin of magnitude
          75  A1     ---     n_Vmag   [J] joint magnitude
      76- 80  F5.2   mag     B-V      ? color
          81  A1     ---     r_B-V   *Note on origin of magnitude
          82  A1     ---     n_B-V   *Joint color
      83- 87  F5.2   mag     U-B      ? color
          88  A1     ---     r_U-B   *Note on origin of magnitude
          89  A1     ---     n_U-B   *Joint color
      90- 94  F5.2   mag     R-I      ? color
          95  A1     ---     r_R-I   *Note on origin of magnitude
          96  A1     ---     n_R-I   *Joint color
      97-102  F6.1   mas     trplx    ? Trigonometric parallax
     103-107  F5.1   mas     e_trplx  ? Standard error of trig. parallax
     109-114  F6.1   mas     plx      ? Resulting parallax
     115-119  F5.1   mas     e_plx    ? Standard error of res.  parallax
         120  A1     ---     n_plx   *[rwsop] Code on plx
     122-126  F5.2   mag     Mv       Absolute visual magnitude
     127-128  A2     ---     n_Mv     Note on Mv, copied from cols 74-75
         129  A1     ---     q_Mv    *[a-f] Quality of absolute magnitude
     132-135  I4     km/s    U        ? U space velocity component in the galactic
                                        plane and directed to the galactic center
     137-140  I4     km/s    V        ? V space velocity component in the galactic
                                        plane and in the direction of galactic
                                        rotation
     142-145  I4     km/s    W        ? W space velocity component in the galactic
                                        plane and in the direction of the
                                        North Galactic Pole
     147-152  I6     ---     HD       [15/352860]? designation
     154-165  A12    ---     DM       Durchmusterung number BD / CD / CP
     167-175  A9     ---     Giclas   number        <...>
     177-181  A5     ---     LHS      number        <...>
     183-187  A5     ---   OtherName *Other designations
     189-257  A69    ---     Remarks  Additional identifications (LTT, LFT,
                                       Wolf, Ross, etc.) and remarks

    Note on Name: the following acronyms are used:
         Gl   Gliese: CNS2,                                 =1969VeARI..22....1G
         GJ   Gliese & Jahreiss, A&AS, 38, 423 (1979)
         Wo   Woolley et al.,   Roy. Obs. Ann. No. 5 (1970)
         NN   newly added stars (number added at CDS)
              See the Nomemclature Note above !
    Note on DistRel: the reliability of the distance is coded:
         s    trig. parallax > 0.0390 and phot. parallax    <  0.0390
         x    trig. parallax > 0.0390 and phot. parallax    <  0.0190
         p    trig. parallax < 0.0390 and phot. parallax    >  0.0390
         q    trig. parallax < 0.0390 and phot. parallax(:) >  0.0390
    Note on n_RV: the following abbreviations are used:
         var  variable (?) radial velocity
         SB?  suspected spectroscopic binary
         SB   spectroscopic binary
    Note on r_Sp: Selected sources (list not complete) for Sp are:
         K    Kuiper Type (see Bildelman)                   =1985ApJS...59..197K
         L    San-Gak Lee                                   =1984AJ.....89..702L
         O    objective prism MK type (but not Michigan type)
         R    Robertson type                                =1984AJ.....89.1229R
         s    Stephenson type       (Catalogue III/123)   =1986AJ.....91..144S
                                                            =1986AJ.....92..139S
         S    Smethells type (IAU Coll. No 76, p. 421, 1983)
         U    Upgren et al. UGP number                      =1972AJ.....77..486U
         W    Mount Wilson type
    Note on r_Vmag, r_U-B, r_B-V, r_R-I:
         The following codes are used (list not complete):
         P    photographic
         *    photometric
         C    from 'Cape refractor system'
         c    calculated or transformed
         v    variable
         :    uncertain
    Note on n_U-B, n_B-V, n_R-I:  This column should only contain a 'J'
         indicating joint magnitudes, but some other letters may
         also be found.
    Note on n_plx: The following indicators are found:
         r    parallax from spectral types and broad-band colors
         w    photom. parallax for white dwarfs
         s    photom. parallax from Stroemgren photometry
         o    photom. parallax from Stroemgren photometry calculated by E. H. Olsen
         p    photom. parallax from other colors
    Note on q_Mv: the Quality code for Mv is
         a               s.e.  <  0.10 mag
         b    0.11  <    s.e.  <  0.20
         c    0.21  <    s.e.  <  0.30
         d    0.31  <    s.e.  <  0.50
         e    0.51  <    s.e.  <  0.75
         f    0.76  <    s.e.
    Note on OtherName: the following acronyms are used:
         V    Vyssotsky number (Catalogue III/13)
         U    UGP       number                      =1972AJ.....77..486U
         W    white dwarf  (EG or Gr number, see catalogue III/129)

    References:
        Gliese W., 1969, Veroeff. Astron. Rechen-Inst. Heidelberg, No 22
                                                    =1969VeARI..22....1G
        Gliese W., Jahreiss H., data 1969-1978      =1979A&AS...38..423G

    See also:
        III/13  : Vyssotsky's catalogues 1950.0 (1943-1958)
        III/129 : Spectroscopically Identified White Dwarfs, 1987,
                  McCook and Sion
        V/32    : Woolley's Catalogue of stars within 25pc of the Sun
        V/35    : Gliese W., Jahreiss H., CNS2 Catalogue and nearby star data
                  1969-1978

    Historical notes:
      * Description initially prepared by Hartmut Jahreiss, Astronomisches
        Rechen-Institut, Moenchhofstrasse 12-14, D-6900 Heidelberg 1, GERMANY.
        The catalogue is distributed on the CD-ROM "Selected Astronomical
        Catalogs", Volume 1, 1991, directory       /combined/nearbyst
      * 05-Sep-1994: reformatted according to CDS Standards (F. Ochsenbein)
        The missing decimal points in the parallax columns (plx trplx e_plx e_trplx)
        has been added, and the blanks between the sign and the number in
        all numeric columns have been removed.
      * 04-Nov-1995: this documentation file revisited at CDS (F. Ochsenbein)
      * 04-Dec-1997: the "NN" number has been completed with a number starting
        with NN 3001 and ending with NN 4388 (See Nomenclature Notes above)
    ================================================================================
    (End)                                    Francois Ochsenbein [CDS]   04-Nov-1995