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 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 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 Σ 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
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