J/A+A/618/A12 Gaia DR1 Upper Scorpius new member candidates (Wilkinson+, 2018)
New member candidates of Upper Scorpius from Gaia DR1.
Wilkinson S., Merin B., Riviere-Marichalar P.
<Astron. Astrophys. 618, A12 (2018)>
=2018A&A...618A..12W 2018A&A...618A..12W (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, standard
Keywords: stars: formation - protoplanetary disks - methods: data analysis
Abstract:
Selecting a cluster in proper motion space is an established method
for identifying members of a star forming region. The first data
release from Gaia (DR1) provides an extremely large and precise
stellar catalogue, which when combined with the Tycho-2 catalogue
gives the 2.5 million parallaxes and proper motions contained within
the Tycho-Gaia Astrometric Solution (TGAS).
We aim to identify new member candidates of the nearby Upper Scorpius
subgroup of the Scorpius-Centaurus Complex within the TGAS catalogue.
In doing so, we also aim to validate the use of the DBSCAN clustering
algorithm on spatial and kinematic data as a robust member selection
method.
We constructed a method for member selection using a density-based
clustering algorithm (DBSCAN) applied over proper motion and distance.
We then applied this method to Upper Scorpius, and evaluated the
results and performance of the method.
We identified 167 member candidates of Upper Scorpius, of which 78 are
new, distributed within a 10° radius from its core. These member
candidates have a mean distance of 145.6±7.5pc, and a mean proper
motion of (-11.4, -23.5)±(0.7, 0.4)mas/yr. These values are
consistent with measured distances and proper motions of previously
identified bona-fide members of the Upper Scorpius association.
Description:
Member candidates of Upper Scorpius, including their SIMBAD ID, as
selected by the DBSCAN algorithm. The "US" column corresponds to
previously identified members of Upper Scorpius, and the "UCL"
column corresponds to previously identified members of Upper
Centaurus-Lupus. 1: Pecaut et al. (2012, Cat. J/ApJ/746/154),
2: Luhman & Mamajek (2012, Cat. J/ApJ/758/31),
3: Chen et al. (2012, Cat. J/ApJ/756/133/),
4: Rizzuto (2015, in AAS/Division for Extreme Solar Systems Abstracts,
Vol. 3, AAS/Division for Extreme Solar Systems Abstracts, 120.03)),
5: Pecaut & Mamajek (2016, Cat. J/MNRAS/461/794)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 232 167 Member candidates of Upper Scorpius
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See also:
J/ApJ/746/154 : Improved kinematic parallaxes for Sco-Cen members
(Pecaut+, 2012)
J/ApJ/758/31 : IR photometry for members of Upper Sco (Luhman+, 2012)
J/ApJ/756/133 : ScoCen debris disks around B- and A-type stars (Chen+, 2012)
J/MNRAS/461/794 : Scorpius-Centaurus K-Type Stars (Pecaut+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Name of the object
25- 42 F18.16 mas Plx Absolute barycentric parallax
44- 62 F19.17 mas e_Plx Parallax error
64- 81 F18.14 deg RAdeg Right ascension (ICRS) at epoch 2015.0
83-101 F19.17 mas e_RAdeg Error in Right ascension
103-121 F19.15 deg DEdeg Declination (ICRS) at epoch 2015.0
123-141 F19.17 mas e_DEdeg Error in Declination
143-162 F20.16 mas/yr pmRA Proper motion in right ascension, pmRA*cosDE
164-183 F20.18 mas/yr e_pmRA Error in proper motion in right ascension
185-203 F19.15 mas/yr pmDE Proper motion in declination
205-224 F20.18 mas/yr e_pmDE Error in proper motion in declination
226-230 A5 --- US Previously identified member of
Upper Scorpius (1)
232 A1 --- UCL Previously identified member of
Upper Centaurus-Lupus (1)
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Note (1): References as follows:
1 = Pecaut et al. (2012, Cat. J/ApJ/746/154)
2 = Luhman & Mamajek (2012, Cat. J/ApJ/758/31)
3 = Chen et al. (2012. Cat. J/ApJ/756/133)
4 = Rizzuto (2015, in AAS/Division for Extreme Solar Systems Abstracts,
Vol. 3, AAS/Division for Extreme Solar Systems Abstracts, 120.03)
5 = Pecaut & Mamajek (2016, Cat. J/MNRAS/461/794)
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Acknowledgements:
Sam Wilkinson, hello(at)samwilkinson.io
(End) Patricia Vannier [CDS] 14-Sep-2018