J/MNRAS/494/2429 Kinematics of nearby young stars (Binks+, 2020)
A kinematically hot population of young stars in the solar neighbourhood.
Binks A.S., Jeffries R.D., Wright N.J.
<Mon. Not. R. Astron. Soc., 494, 2429-2439 (2020)>
=2020MNRAS.494.2429B 2020MNRAS.494.2429B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, late-type ; Spectroscopy ; Stars, ages ; Equivalent widths
Keywords: stars: kinematics and dynamics - stars: late-type -
stars: pre-main-sequence - solar neighbourhood
Abstract:
In the last three decades several hundred nearby members of young
stellar moving groups (MGs) have been identified, but there has been
less systematic effort to quantify or characterize young stars that do
not belong to previously identified MGs. Using a kinematically
unbiased sample of 225 lithium-rich stars within 100 pc, we find that
only 50±10 per cent of young (≤125Myr), low-mass
(0.5<M/M☉<1.0) stars, are kinematically associated with known
MGs. Whilst we find some evidence that five of the non-MG stars may be
connected with the Lower Centaurus-Crux association, the rest form a
kinematically 'hotter' population, much more broadly dispersed in
velocity, and with no obvious concentrations in space. The mass
distributions of the MG members and non-MG stars are similar, but the
non-MG stars may be older on average. We briefly discuss several
explanations for the origin of the non-MG population.
Description:
Gaia DR2 data, 2MASS photometry, EW(Li)s, masses, ages, UVW
velocities, RVs, MG matches from the chi-squared analysis and from the
BANYANΣ code, and the source survey paper for all nearby, likely
young stars discussed in this work. The table is only available in
electronic format.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 336 225 Data for all nearby, likely young stars (NLYS)
discussed in the paper
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- 2MASS 2MASS Identifier (HHMMSSss+DDMMSSs)
18- 24 F7.4 mas Plx Gaia DR2 Parallax
26- 31 F6.4 mas e_Plx Uncertainty in Plx
33- 40 F8.3 mas/yr pmRA Gaia DR2 Proper-motion in right ascension,
pmRA*cosDE
42- 46 F5.3 mas/yr e_pmRA Uncertainty in pmRA
48- 55 F8.3 mas/yr pmDE Gaia DR2 Proper-motion in declination
57- 61 F5.3 mas/yr e_pmDE Uncertainty in pmDE
63- 69 F7.4 mag Gmag Gaia DR2 apparent G-band magnitude
71- 76 F6.4 mag e_Gmag Uncertainty in Gmag
78- 82 F5.3 mag Ksmag 2MASS apparent Ks-band magnitude
84- 88 F5.3 mag e_Ksmag Uncertainty in Ksmag
90- 92 I3 0.1pm EWLi Equivalent width of Li-feature at 6708Å
94- 95 I2 0.1pm e_EWLi ? Uncertainty in EWLi
97-101 F5.3 Msun Mass Median mass calculated from SED fitting
103-107 F5.3 Msun Mass16 Median mass - 16th percentile mass
109-113 F5.3 Msun Mass84 Median mass - 84th percentile mass
115 A1 --- l_Age [≥] Lower limit (>) or measurement (=)
117-120 F4.1 Myr Age Median age calculated from SED fitting
122-125 F4.1 Myr Age16 ? Median age - 16th percentile age
127-130 F4.1 Myr Age84 ? Median age - 84th percentile age
132-138 F7.2 km/s Uvel Velocity in direction of Galactic centre
140-143 F4.2 km/s e_Uvel Uncertainty in Uvel
145-150 F6.2 km/s Vvel Velocity in direction of Galactic rotation
152-155 F4.2 km/s e_Vvel Uncertainty in Vvel
157-163 F7.2 km/s Wvel Velocity in direction of Galactic North Pole
165-168 F4.2 km/s e_Wvel Uncertainty in Wvel
170-177 F8.3 km/s RV1 Radial velocity measurement 1
179-184 F6.3 km/s e_RV1 Uncertainty in RV1
186-193 F8.3 km/s RV2 ? Radial velocity measurement 2
195-199 F5.3 km/s e_RV2 ? Uncertainty in RV2
201-208 F8.3 km/s RV3 ? Radial velocity measurement 3
210-214 F5.3 km/s e_RV3 ? Uncertainty in RV3
216-223 F8.3 km/s RV4 ? Radial velocity measurement 4
225-229 F5.3 km/s e_RV4 ? Uncertainty in RV4
231-238 F8.3 km/s RV5 ? Radial velocity measurement 5
240-244 F5.3 km/s e_RV5 ? Uncertainty in RV5
246-253 F8.3 km/s RV6 ? Radial velocity measurement 6
255-259 F5.3 km/s e_RV6 ? Uncertainty in RV6
261-266 F6.3 km/s RV7 ? Radial velocity measurement 7
268-272 F5.3 km/s e_RV7 ? Uncertainty in RV7
274 A1 --- r_RV1 Reference for RV1 (1)
275 A1 --- r_RV2 Reference for RV2 (1)
276 A1 --- r_RV3 Reference for RV3 (1)
277 A1 --- r_RV4 Reference for RV4 (1)
278 A1 --- r_RV5 Reference for RV5 (1)
279 A1 --- r_RV6 Reference for RV6 (1)
280 A1 --- r_RV7 Reference for RV7 (1)
282-289 F8.3 km/s RVf Final calculated radial velocity
291-295 F5.3 km/s e_RVf Uncertainty in RVf
297 I1 --- Binflag [1/9] Flag on binarity status (2)
299-325 A27 --- chiMG Moving groups with chi-square values <2.60
(see paper for details) (3)
327-329 A3 --- BANMG Most probable moving group membership based on
the BANYANΣ code
331-334 F4.1 --- BANProb ? Probability of moving group membership to
moving group in BANMG
336 A1 --- Survey Original survey publication (1)
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Note (1): Referenced publications as follows:
a = Bobylev, 2006AstL...32..816B 2006AstL...32..816B, Cat. J/other/AstL/32.816
b = Gontcharov, 2006A&AT...25..145G 2006A&AT...25..145G, Cat. III/252
c = Torres et al., 2006A&A...460..695T 2006A&A...460..695T, Cat.J/A+A/460/695
d = Elliott et al., 2014A&A...568A..26E 2014A&A...568A..26E, Cat. J/A+A/568/A26
e = Kunder et al., 2017AJ....153...75K 2017AJ....153...75K
f = Gaia Collaboration et al., 2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345
g = Soubiran et al., 2018A&A...616A...7S 2018A&A...616A...7S, Cat. J/A+A/616/A7
h = Malo et al., 2014ApJ...788...81M 2014ApJ...788...81M, Cat. J/ApJ/788/81
i = Shkolnik et al., 2017AJ....154...69S 2017AJ....154...69S, Cat. J/AJ/154/69
j = Binks et al., 2018MNRAS.473.2465B 2018MNRAS.473.2465B, Cat. J/MNRAS/473/2465
k = Guillout et al., 2009A&A...504..829G 2009A&A...504..829G, Cat. J/A+A/504/829
l = Frasca et al., 2018A&A...612A..96F 2018A&A...612A..96F, Cat. J/A+A/612/A96
m = Kharchenko et al., 2007AN....328..889K 2007AN....328..889K, Cat. III/254
n = White et al., 2007AJ....133.2524W 2007AJ....133.2524W, Cat. J/AJ/133/2524
o = Binks et al., 2015MNRAS.452..173B 2015MNRAS.452..173B, Cat. J/MNRAS/452/173
p = Kraus et al., 2017ApJ...838..150K 2017ApJ...838..150K, Cat. J/ApJ/838/150
q = Alcala et al., 2000A&A...353..186A 2000A&A...353..186A
r = Schneider et al., 2019AJ....157..234S 2019AJ....157..234S, Cat. J/AJ/157/234
s = Kordopatis et al., 2013AJ....146..134K 2013AJ....146..134K, Cat. III/272
t = Reid et al., 1995AJ....110.1838R 1995AJ....110.1838R, Cat. III/198
u = Lopez Marti et al., 2013A&A...556A.144L 2013A&A...556A.144L, Cat. J/A+A/556/A144
v = Luo et al., 2015PNAS..112E4638L 2015PNAS..112E4638L
w = Lepine & Simon, 2009AJ....137.3632L 2009AJ....137.3632L
x = Bowler et al., 2019ApJ...877...60B 2019ApJ...877...60B
Note (2): The integer numbers correspond to the following binarity status:
1 = Only one radial velocity measurement, binary status indeterminate
3 = Two or more consistent radial velocity measurements, likely single star
5 = Two or more inconsistent radial velocity measurements
likely multiple star
9 = Two or more radial velocity measurements whose errors are too large
to determine binary status
Note (3): Ordered from lowest to highest chi-square value.
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Acknowledgements:
Alexander Binks, a.s.binks1(at)keele.ac.uk
(End) Alexander Binks [Keele Univ., UK], Patricia Vannier [CDS] 31-Aug-2020