J/MNRAS/446/2055 Radial velocities of southern SIM grid stars (Makarov+, 2015)
Radial velocities and binarity of southern SIM grid stars.
Makarov V.V., Unwin S.C.
<Mon. Not. R. Astron. Soc., 446, 2055-2058 (2015)>
=2015MNRAS.446.2055M 2015MNRAS.446.2055M
ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: binaries: spectroscopic - stars: kinematics and dynamics
Abstract:
We present analysis of precision radial velocities (RV) of 1134 mostly
red giant stars in the southern sky, selected as candidate astrometric
grid objects for the Space Interferometry Mission (SIM). Only a few
(typically, two or three) spectroscopic observations per star have
been collected, with the main goal of screening binary systems. The
estimated rate of spectroscopic binarity in this sample of red giants
is 32 per cent at the 0.95 confidence level, and 46 per cent at the
0.75 confidence. The true binarity rate is likely to be higher,
because our method is not quite sensitive to very wide binaries and
low-mass companions. The estimated lower and upper bounds of stellar
RV jitter for the entire sample are 24 and 51m/s, respectively; the
adopted mean value is 37m/s. A few objects of interest are identified
with large variations of RV, implying abnormally high mass ratios.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 97 3026 Radial velocity data for 1334 SIM grid stars
(candidates for the Space Interferometry Mission)
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
J/AJ/131/1784 : Astrometric Grid Giant Star Survey. I. (Bizyaev+, 2006)
J/AJ/140/1911 : Astrometric Grid Giant Star Survey. III. (Bizyaev+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Name of the star (1)
14- 23 F10.6 deg RAdeg Right ascension (J2000)
25- 34 F10.6 deg DEdeg Declination (J2000)
36 I1 --- o_ [1/7] Number of RV observations
38- 46 F9.4 km/s [-130/207] Mean barycentric radial velocity
48- 55 F8.4 km/s e_ [0.03/425] Mean RV uncertainty including the
estimated stellar jitter
57- 61 F5.3 --- bin [0/1] Binarity confidence
(0 to 1, 1 is the highest confidence)
63 I1 --- b75 [0/1] Binarity flag at 0.75 confidence
(0 for non-binary or 1 for binary)
65 I1 --- b95 [0/1] Binarity flag at 0.95 confidence
(0 for non-binary or 1 for binary)
67- 82 F16.8 d JD Julian date of observation
84- 92 F9.4 km/s RV [-274/553] Observed barycentric radial velocity
94- 97 F4.1 m/s e_RV [0.9/39] Formal observational error on RV
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Note (1): Mostly Tycho-2 identifications as NNNN-NNNNN-N (TYC NNNN-NNNNN-N in
Simbad), others (GHHMM-DD.NNN) are from Bizyaev et al., 2006 (J/AJ/131/1784)
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Acknowledgements:
Valeri Makarov, valeri.makarov(at)usno.navy.mil
History:
* 05-Jun-2015: First on-line publication
* 03-May-2016: Name and positions of 20 sources corrected, from author
(sources intially named HHMM-DD.NNNN)
(End) Patricia Vannier [CDS] 05-Jun-2015