J/ApJ/928/70 Gaia EDR3 members stars of 55 FoF groups (Coronado+, 2022)
Pearls on a string: numerous stellar clusters strung along the same orbit.
Coronado J., Furnkranz V., Rix H.-W.
<Astrophys. J., 928, 70 (2022)>
=2022ApJ...928...70C 2022ApJ...928...70C
ADC_Keywords: Milky Way; Associations, stellar; Clusters, open
Keywords: Milky Way dynamics ; Milky Way disk ; Stellar kinematics ;
Star clusters ; Stellar associations
Abstract:
Stars originate from the dense interstellar medium, which exhibits
filamentary structure to scales of ∼1kpc in galaxies like our Milky
Way. We explore quantitatively how much resulting large-scale
correlation there is among different stellar clusters and associations
in orbit-phase space, characterized here by actions and angles. As a
starting point, we identified 55 prominent stellar overdensities in
the 6D space of orbit (actions) and orbit-phase (angles) among the
∼2.8 million stars with radial velocities from Gaia EDR3 and with
d≤800pc. We then explored the orbit-phase distribution of all sample
stars in the same orbit patch as any one of these 55 overdensities. We
find that very commonly numerous other distinct orbit-phase
overdensities exist along these same orbits, like pearls on a string.
These "pearls" range from known stellar clusters to loose,
unrecognized associations. Among orbit patches defined by one initial
orbit-phase overdensity, 50% contain at least 8 additional orbit-phase
pearls of 10 cataloged members; 20% of them contain 20 additional
pearls. This is in contrast to matching orbit patches sampled from a
smooth mock catalog, or offset nearby orbit patches, where there are
only 2 (or 5, respectively) comparable pearls. Our findings quantify
for the first time how common it is for star clusters and associations
to form at distinct orbit-phases of nearly the same orbit. This may
eventually offer a new way to probe the 6D orbit structure of the
filamentary interstellar medium.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 76 4927 Identified member stars of the 55 friends-of-friends
algorithm (FoF) groups
table2.dat 49 55 Properties of the 55 initial groups
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See also:
B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2015)
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
J/A+A/331/81 : Hyades membership (Perryman+ 1998)
J/AcA/50/355 : OGLE Multiple Cluster Candidates in LMC (Pietrzynski+, 2000)
J/A+A/379/136 : UBVRI photometry of 3 young open clusters (Carraro+, 2001)
J/A+A/391/547 : Binary and multiple clusters in the LMC (Dieball+, 2002)
J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)
J/MNRAS/403/996 : Clusters and associations in SMC and LMC (Bonatto+, 2010)
J/ApJ/795/161 : Activity & rotation in Praesepe & Hyades (Douglas+, 2014)
J/MNRAS/442/2081 : Praesepe members light curves (Kovacs+, 2014)
J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)
J/A+A/586/A41 : LMC star clusters catalog (Palma+, 2016)
J/A+A/600/A106 : RAVE open cluster pairs, groups & complexes (Conrad+, 2017)
J/A+A/601/A70 : GES: pre-main-sequence clusters [Fe/H] (Spina+, 2017)
J/ApJ/862/138 : BANYAN. XIII. Nearby young assoc. with Gaia (Gagne+, 2018)
J/A+A/619/A155 : Open cluster kinematics with Gaia DR2 (Soubiran+, 2018)
J/A+A/615/A12 : Nearby open clusters TGAS and HSOY reanalysis (Yen+, 2018)
J/AJ/158/77 : Members of the Pisces-Eridanus stream (Curtis+, 2019)
J/A+A/622/A110 : Spectroscopic membership for NGC 3532 (Fritzewski+, 2019)
J/A+A/624/L11 : Coma Berenices neighbor moving group (Fuernkranz+, 2019)
J/AJ/158/122 : Local structure & SFH of the MW (Kounkel+, 2019)
J/A+A/622/L13 : Stellar stream in Gaia DR2 discovery (Meingast+, 2019)
J/ApJ/877/12 : ComaBer & a Neighbor Stellar Group tidal tails (Tang+, 2019)
J/A+A/633/A99 : Gaia DR2 open clusters in the MW. II (Cantat-Gaudin+, 2020)
J/MNRAS/496/2422 : Abund. of 42 Pisces-Eridanus stream stars (Hawkins+, 2020)
J/A+A/639/A64 : Extended Meingast 1 source catalogue (Ratzenboeck+, 2020)
J/A+A/645/A84 : Coronae of nearby star clusters (Meingast+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- GroupID [1/55] Group ID
4- 22 I19 --- GaiaEDR3 Gaia EDR3 Source ID
24- 30 F7.4 kpc.km/s JR [0.0058/44.2] Radial action
32- 37 F6.4 kpc.km/s Jz [0.0004/2.4] Vertical action
39- 47 F9.4 kpc.km/s Jphi [1552.7/1931.6] Azimutal action
(angular momentum)
49- 57 F9.4 deg AngleR [-180/180] Radial angle, θR
59- 67 F9.4 deg Anglez [-180/180] Vertical angle, θz
69- 76 F8.4 deg Anglephi [-11/17.5] Azimuthal angle, θφ
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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- 2 I2 --- GroupID [1/55] Group ID
4- 6 I3 --- Nstar [20/638] Number of members
8- 12 F5.2 kpc.km/s JR [0.58/41] Group mean radial action
14- 18 F5.3 kpc.km/s Jz [0.06/2.1] Group mean vertical action
20- 26 F7.2 kpc.km/s Jphi [1566/1925] Group mean azimutal action
(angular momentum)
28- 34 F7.2 deg AngleR [-164/173] Group mean radial angle
36- 42 F7.2 deg Anglez [-172/165] Group mean vertical angle
44- 49 F6.3 deg Anglephi [-10/17] Group mean azimuthal angle
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 26-Jan-2024