J/ApJ/938/100 Gaia EDR3 members of the Praesepe cluster (Hao+, 2022)
On the nature of rotation in the Praesepe cluster.
Hao C.J., Xu Y., Bian S.B., Hou L.G., Lin Z.H., Li Y.J., Liu D.J.
<Astrophys. J., 938, 100 (2022)>
=2022ApJ...938..100H 2022ApJ...938..100H
ADC_Keywords: Clusters, open; Parallaxes, trigonometric; Proper motions;
Radial velocities; Colors; Photometry; Optical
Keywords: Open star clusters ; Stellar kinematics
Abstract:
Although a large number of Galactic open clusters (OCs) have been
identified, the internal kinematic properties (e.g., rotation) of
almost all the known OCs are still far from clear. With the
high-precision astrometric data of Gaia EDR3, we have developed a
methodology to unveil the rotational properties of the Praesepe
cluster. Statistics of the three-dimensional residual motions of the
member stars reveal the presence of Praesepe's rotation and determine
its spatial rotation axis. The mean rotation velocity of the Praesepe
cluster within its tidal radius is estimated to be 0.2±0.05km/s, and
the corresponding rotation axis is tilted in relation to the Galactic
plane with an angle of 41°±12°. We also analyzed the rms
rotational velocity of the member stars around the rotation axis, and
found that the rotation of the member stars within the tidal radius of
Praesepe probably follows Newton's classical theorems.
Description:
In this study, we focus on the Praesepe cluster, also known as the
Beehive Cluster, located at a distance of 170-190pc from the Sun.
We first extract the member stars of Praesepe from Gaia EDR3, all of
which have six-parameter solutions and RVs; see Section 2.
Objects:
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RA (ICRS) DE Designation(s)
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08 40 12.96 +19 37 15.5 Praesepe Cluster = NAME Beehive
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 156 172 Astrometric parameters and errors of selected
member stars with 3D kinematic measurements
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See also:
B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2015)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/AJ/80/379 : Hyades cluster: motion, membership & dist (Hanson+, 1975)
J/A+A/331/81 : Hyades membership (Perryman+ 1998)
J/AJ/124/1570 : JHKs photometry in Praesepe (Adams+, 2002)
J/AJ/134/2340 : Membership of Praesepe & Coma Ber clusters (Kraus+, 2007)
J/MNRAS/399/2146 : Orbits of open clusters in the Galaxy (Wu+, 2009)
J/MNRAS/413/2218 : Stellar rotation in Hyades and Praesepe (Delorme+, 2011)
J/MNRAS/434/3236 : Masses of Praesepe members (Khalaj+, 2013)
J/A+A/558/A53 : MW global survey of star clusters. II. (Kharchenko+, 2013)
J/ApJ/769/107 : RVs and [Fe/H] of star members of NGC 6388 (Lanzoni+, 2013)
J/ApJ/784/57 : Photometry and proper motions in Praesepe (Wang+, 2014)
J/A+A/618/A93 : Gaia DR2 open clusters in the MW (Cantat-Gaudin+, 2018)
J/A+A/616/A10 : Open clusters GaiaDR2 HR diagrams (Gaia Collaboration, 2018)
J/A+A/628/A66 : alpha Persei, Pleiades and Praesepe clusters (Lodieu+, 2019)
J/ApJ/885/131 : High-mass SFR plx & proper motion with VLBI (Reid+, 2019)
J/A+A/627/A4 : Praesepe (NGC 2632) and its tidal tails (Roeser+, 2019)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/A+A/635/A45 : Open clusters in the Galactic disc (Castro-Ginard+, 2020)
J/A+A/652/A102 : 3794 open clusters parameters (Hao+, 2021)
J/ApJ/923/23 : Stellar spins in the Pleiades, Praesepe & M35 (Healy+, 2021)
J/A+A/651/A104 : Spiral arms Gaia EDR3 (Poggio+, 2021)
J/A+A/653/A160 : Updated radial velocities from Gaia DR2 (Seabroke+, 2021)
J/A+A/661/A118 : Open clusters found with OCfinder (Castro-Ginard+, 2022)
J/A+A/660/A4 : Gaia EDR3 new Galactic open clusters (Hao+, 2022)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 18 I18 --- Gaia Gaia EDR3 source_id
20- 29 F10.6 deg RAdeg [119.6/133] Right Ascension (ICRS) at Ep=2016.0
31- 39 F9.6 deg DEdeg [11.4/24.8] Declination (ICRS) at Ep=2016.0
41- 50 F10.6 deg GLON [200.9/216.2] Galactic longitude
52- 60 F9.6 deg GLAT [23.1/36.1] Galactic latitude
62- 69 F8.6 mas plx [4.62/6.02] Parallax
71- 78 F8.6 mas e_plx [0.014/0.4] Error of parallax
80- 89 F10.6 mas/yr pmRA [-40.9/-31] Proper motion in RA, pmRA*cosDE
91- 98 F8.6 mas/yr e_pmRA [0.013/0.4] Error of pmRA
100-109 F10.6 mas/yr pmDE [-15.8/-10.2] Proper motion in declination
111-118 F8.6 mas/yr e_pmDE [0.01/0.3] Error of pmDE
120-128 F9.6 mag Gmag [6.15/13.6] Gaia EDR3 G-band mean magnitude
130-137 F8.6 mag Bp-Rp [0.4/1.7] Gaia EDR3 (Bp-Rp) color index
139-147 F9.6 km/s RVel [30.6/40.1] Spectroscopic radial velocity
in the solar barycentric reference frame
149-156 F8.6 km/s e_RVel [0.14/2] Error of RVel
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 28-Aug-2024