J/AJ/159/166 Membership & properties of moving groups with Gaia (Ujjwal+, 2020)
Analysis of membership probability in nearby young moving groups with Gaia DR2.
Ujjwal K., Kartha S.S., Mathew B., Manoj P., Narang M.
<Astron. J., 159, 166-166 (2020)>
=2020AJ....159..166U 2020AJ....159..166U (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar; Stars, ages; Space velocities;
Spectral types; Stars, distances
Keywords: Stellar kinematics; Proper motions; Radial velocity
Stellar associations
Abstract:
We analyze the membership probability of young stars belonging to
nearby moving groups with Gaia DR2 data. The sample of 1429 stars was
identified from "The Catalog of Suspected Nearby Young Moving Group
Stars" (CSNYMGS; see Riedel+, J/AJ/153/95). Good-quality parallax and
proper motion values were retrieved for 890 stars from the Gaia DR2
database. The analysis for membership probability is performed in the
framework of the LACEwING algorithm (Riedel 2016IAUS..314...33R 2016IAUS..314...33R). From
the analysis it is confirmed that 279 stars do not belong to any of
the known moving groups. We estimated the U, V, W space velocity
values for 250 moving group members, which were found to be more
accurate than previous values listed in the literature. The velocity
ellipses of all the moving groups are well constrained within the
"good box," a widely used criterion to identify moving group members.
The age of moving group members are uniformly estimated from the
analysis of the Gaia color-magnitude diagram with MIST isochrones. We
found a spread in the age distribution of stars belonging to some
moving groups, which needs to be understood from further studies.
Description:
The objective of the present study is to use the best available
astrometric and photometric data provided by the Gaia DR2 (I/345) to
estimate the membership and properties of moving groups. For this work
we employed all 13 nearby young moving groups (NYMGs) identified to
date, namely, epsilon Chamaeleontis, Hercules-Lyra, TW Hydra,
β-Pictoris, Octans, Tucana-Horologium, Columba, Argus, AB
Doradus, Ursa Major, chi01-For, Carina, and Carina-near.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 42 The U, V, W values estimated from Gaia DR2
compared with other references
table2.dat 164 611 Stellar parameters estimated of moving group
members from the analysis with Gaia DR2 data
table4.dat 42 13 Moving group characteristics obtained from our
study
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/MNRAS/328/45 : Late-type stars members of young groups (Montes+, 2001)
J/A+A/521/A12 : Radial velocities of nearby late-type stars (Maldonado+,2010)
J/ApJ/758/56 : Young M dwarfs within 25pc. II. Kinematics (Shkolnik+, 2012)
J/ApJ/762/88 : Young stellar kinematic group candidate members (Malo+, 2013)
J/ApJ/798/73 : BANYAN All-Sky Survey catalog. V. Nearby YMGs (Gagne+, 2015)
J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)
J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)
J/A+A/599/A70 : Young moving group M-dwarf multiplicity (Janson+, 2017)
J/AJ/153/95 : Catalog of Suspected Nearby Young Stars (Riedel+, 2017)
J/ApJ/867/93 : YNMGs kinematics from RAVE & Gaia (Ramirez-Preciado+, 2018)
J/AJ/158/187 : Confirmed members of nearby young moving groups (Baron+,2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Star name
16- 21 F6.2 km/s U1 [-28.8/-2.6]? Previous studies, U
23- 26 F4.2 km/s e_U1 [0.1/5]? error in U1
28- 33 F6.2 km/s V1 [-32.6/-17]? Previous studies, V
35- 38 F4.2 km/s e_V1 [0.2/4.4]? error in V1
40- 45 F6.2 km/s W1 [-21.2/-0.6]? Previous studies, W
47- 50 F4.2 km/s e_W1 [0.1/2.6]? error in W1
52- 52 I1 --- Ref Reference for UVW1 (1)
54- 59 F6.2 km/s U2 [-29.3/-1.5]? Gaia estimate, U
61- 64 F4.2 km/s e_U2 [0.01/1.6]? error in U2
66- 71 F6.2 km/s V2 [-31.6/-17.3]? Gaia estimate, V
73- 76 F4.2 km/s e_V2 [0.03/2.1]? error in V2
78- 83 F6.2 km/s W2 [-20.7/-4.8]? Gaia estimate, W
85- 88 F4.2 km/s e_W2 [0.02/5.2]? error in W2
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Note (1): References as follows:
1 = Montes+, 2001, J/MNRAS/328/45
2 = Malo+, 2013, J/ApJ/762/88
3 = Maldonado+, 2010, J/A+A/521/A12
4 = Shkolnik+, 2012, J/ApJ/758/56
5 = Schlieder+, 2012AJ....144..109S 2012AJ....144..109S
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 27 A27 --- Name Star name
29- 43 F15.11 deg RAdeg [0.3/360] Gaia DR2 (I/345) barycentric
right ascension (ICRS) at Ep=2015.5
45- 59 F15.11 deg DEdeg [-87.8/79.8] Gaia DR2 (I/345) barycentric
declination (ICRS) at Ep=2015.5
61- 69 A9 --- Group Moving Group designation
71- 73 I3 % Memb [20/100] Membership Probability
75- 82 A8 --- SpT Spectral Type
84- 89 F6.3 mag Gmag [3.22/20.97] Gaia DR2 G-band magnitude
91- 95 F5.1 pc Dist [7.8/151] Distance
97-113 F17.15 pc e_Dist [0/5.2] Error in distance
115-119 F5.2 Myr Age [1.15/61]? Age
121-125 F5.2 Myr e_Age [0/41]? error in age
127-132 F6.2 km/s U [-32.2/19.6]? U
134-137 F4.2 km/s e_U [0.01/8.3]? error in U
139-144 F6.2 km/s V [-31.5/5.34]? V
146-150 F5.2 km/s e_V [0.03/13]? error in V
152-159 F8.4 km/s W [-28.4/11.7]? W
161-164 F4.2 km/s e_W [0.01/9.5]? error in W
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Group Moving Group designation
11- 15 F5.1 pc Dist [25/123.5] Distance
17- 21 F5.2 Myr Age [4.9/34.8] Age
23- 28 F6.2 km/s U [-27.4/14.1] Group mean U space velocity
30- 35 F6.2 km/s V [-27.4/1.9] Group mean V space velocity
37- 42 F6.2 km/s W [-12.9/-0.7] Group mean W space velocity
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 11-May-2020