Access to Astronomical Catalogues

J/A+A/546/A61       Radial velocities for XHIP catalogue    (de Bruijne+, 2012)
Radial velocities for the Hipparcos-Gaia Hundred-Thousand-Proper-Motion project.
    de Bruijne J.H.J., Eilers A.-C.
   <Astron. Astrophys. 546, A61 (2012)>
   =2012A&A...546A..61D
ADC_Keywords: Stars, nearby ; Radial velocities ; Proper motions

Keywords: techniques: radial velocities -
          astronomical databases: miscellaneous - catalogs - astrometry -
          parallaxes - proper motions

Abstract:
    The Hundred-Thousand-Proper-Motion (HTPM) project will determine the
    proper motions of ∼113500 stars using a ∼23-year baseline. The
    proper motions will be based on space-based measurements exclusively,
    with the Hipparcos data, with epoch 1991.25, as first epoch and with
    the first intermediate-release Gaia astrometry, with epoch ∼2014.5, as
    second epoch. The expected HTPM proper-motion standard errors are
    30-190µas/yr, depending on stellar magnitude.

    Depending on the astrometric characteristics of an object, in
    particular its distance and velocity, its radial velocity can have a
    significant impact on the determination of its proper motion. The
    impact of this perspective acceleration is largest for fast-moving,
    nearby stars. Our goal is to determine, for each star in the Hipparcos
    catalogue, the radial-velocity standard error that is required to
    guarantee a negligible contribution of perspective acceleration to the
    HTPM proper-motion precision.

Description:
    Table A.1 covers the 117955 entries of the XHIP catalogue (Anderson &
    Francis 2012AstL...38..331A, Cat. V/137). These are all
    Hipparcos-catalogue entries with astrometry. Columns 1-7 refer to data
    extracted from the XHIP catalogue described in Section 2. Columns 8-10
    summarise some key quantities of our method. Columns 11-14 provide
    data from the N = 10000 Monte-Carlo simulations that we ran for each
    star (Section 4.4). Columns 15-18 refer to the Gaussian criterion
    developed in Section 5.1. Columns 19-22 refer to the robust criterion,
    which is described in Section 5.2. The 206 stars identified by us that
    require spectroscopic follow-up are those with sigma68Robust < 68.27%.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
tablea1.dat      181   117955   Final-results


See also:
   I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
   I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
   V/137 : Extended Hipparcos Compilation (XHIP) (Anderson+, 2012)


Byte-by-byte Description of file: tablea1.dat

   Bytes Format Units    Label    Explanations

   1-  6  I6    ---      HIP      [1/120404] Hipparcos identifier
   8- 15  F8.2  km/s     RV       ? Radial velocity from XHIP (V/137) (1)
  17- 24  F8.2  km/s     e_RV     ? Error on RV (1)
  26- 28  I3    ---      q_RV     [1/4]? Quality flag for RV, 1=best (1) (2)
  30- 35  F6.2  mas      plx      Trigonometric parallax from XHIP
  37- 42  F6.2  mas      e_plx    Trigonometric parallax error
  44- 51  F8.4  mag      Hpmag    Hipparcos broad-band Hp magnitude
  53- 60  F8.4 uas/yr/km/s C      ? Proper-motion sensitivity to
                                    radial velocity (3)
  62- 71  F10.2 km/s     Sigma    ? Σ for the "error-free" XHIP
                                    astrometry (3)
  73- 75  I3    ---      f_Sigma  [1/2]? Coordinate flag for Sigma and C:
                                    1=Right Ascension, 2=Declination (4)
  77- 86  F10.2 km/s     Sig.med  ? Median {Sgima} value of the 10,000 
                                    Monte-Carlo simulations (3)
  88- 97  F10.2 km/s     Sig.min  ? Smallest Σ value maong the 10,000
                                    Monte-Carlo simulations (3)
  99-108  F10.2 km/s     mu.Sig   ? Mean of the Gauss fit to the 10,000
                                    Monte-Carlo simulations (3)
 110-119  F10.2 km/s     sig.Sig  ? Standard deviation of the Gauss fit (3)
 121-126  F6.2  %        c(G)     [0/100]? Gaussian confidence level (3)
 128-134  F7.2  km/s     sig68G   ? Radial-velocity precision needed for
                                    c(G)=68.27% (3) (6) (5)
 136-142  F7.2  km/s     sig95G   ? Radial-velocity precision needed for
                                    c(G)=95.45% (3) (6) (5)
 144-150  F7.2  km/s     sig99G   ? Radial-velocity precision needed for
                                    c(G)=99.73% (3) (6) (5)
 152-157  F6.2  %        c(rob)   [0/100]? Robust confidence level (3)
 159-165  F7.2  km/s    sig68rob  ? Radial-velocity precision needed for
                                    c(rob)=68.27% (3) (6)
 167-173  F7.2  km/s    sig95rob  ? Radial-velocity precision needed for
                                    c(rob)=95.45% (3) (6)
 175-181  F7.2  km/s    sig99rob  ? Radial-velocity precision needed for
                                    c(rob)=99.73% (3) (6)

Note (1): For stars without literature radial velocity, these columns are
     blank (see Section 2.2).
Note (2): Quality flag is:
   1 = Most likely to be within stated error bounds (A) from XHIP
   2 = May have small systematic errors (B) from XHIP
   3 = May have larger systematic errors (C) from XHIP
   4 = No error available or other serious problems (D) from XHIP
Note (3): for the 11171 entries with insignificant parallax measurements in
     the XHIP catalogue, these columns are blank (see Section 4.4).
Note (4): The flag indicates to which Coordinate Sigma and C refer:
   1 = C and Sigma refer to right ascension
   2 = C and Sigma refer to declination
Note (5): if, for the given value of the confidence level c(G), the
     argument of the square root in Equation (20) is negative, these
     columns are blank (see Section 5.1)
Note (6): if the radial-velocity precision (standard error) to reach a
     certain confidence level exceeds 9999.99 km/s, a value of 9999.99km/s
     is listed.


Acknowledgements:
    Jos de Bruijne, jdbruijn(at)rssd.esa.int
(End)          Jos de Bruijne [ESA/ESTEC], Patricia Vannier [CDS]    16-Aug-2012