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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 181 117955 Final-results
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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
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Bytes Format Units Label Explanations
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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)
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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.
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Acknowledgements:
Jos de Bruijne, jdbruijn(at)rssd.esa.int
(End) Jos de Bruijne [ESA/ESTEC], Patricia Vannier [CDS] 16-Aug-2012