J/ApJS/257/46 Membership and rotational data for clusters (Godoy-Rivera+, 2021)
Stellar rotation in the Gaia era: revised open clusters' sequences.
Godoy-Rivera D., Pinsonneault M.H., Rebull L.M.
<Astrophys. J. Suppl. Ser., 257, 46-46 (2021)>
=2021ApJS..257...46G 2021ApJS..257...46G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, ages; Optical
Keywords: open star clusters - star clusters - stellar ages - stellar rotation -
low mass stars
Abstract:
The period versus mass diagrams (i.e., rotational sequences) of open
clusters provide crucial constraints for angular momentum evolution
studies. However, their memberships are often heavily contaminated by
field stars, which could potentially bias the interpretations. In this
paper, we use data from Gaia DR2 to reassess the memberships of seven
open clusters with ground- and space-based rotational data, and
present an updated view of stellar rotation as a function of mass and
age. We use the Gaia astrometry to identify the cluster members in
phase space, and the photometry to derive revised ages and place the
stars on a consistent mass scale. Applying our membership analysis to
the rotational sequences reveals that: (1) the contamination in
clusters observed from the ground can reach up to ∼35%; (2) the
overall fraction of rotational outliers decreases substantially when
the field contaminants are removed, but some outliers persist; (3)
there is a sharp upper edge in the rotation periods at young ages; (4)
at young ages, stars in the 1.0-0.6M☉ range inhabit a global
maximum of rotation periods, potentially providing an optimal window
for habitable planets. Additionally, we see clear evidence for a
strongly mass-dependent spin-down process. In the regime where rapid
rotators are leaving the saturated domain, the rotational
distributions broaden (in contradiction with popular models), which we
interpret as evidence that the torque must be lower for rapid rotators
than for intermediate ones. The cleaned rotational sequences from
ground-based observations can be as constraining as those obtained
from space.
Description:
In this work, we revise the memberships of open clusters with
previously existing rotational data using astrometry from the Gaia
mission. With this, we present an updated view of stellar rotation
rotation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 329 10757 Main information and properties for the
probable and possible cluster members
tablef1.dat 301 3492 Main information and properties for the
periodic samples
tableg1.dat 116 53 Percentiles of the distribution of rotation
periods as a function of mass and age
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 -- Cluster Cluster Name (G1)
10- 28 I19 -- GaiaDR2 GaiaDR2 ID
30- 48 F19.15 deg RAdeg Right ascension (ICRS) at Ep=2015.5
50- 69 F20.16 deg DEdeg Declination (ICRS) at Ep=2015.5
71- 92 F22.19 mas plx Parallax
94-113 F20.18 mas e_plx Parallax error
115-137 F23.19 mas/yr pmRA Proper motion in Right Ascension, pmRA*cosDE
139-158 F20.18 mas/yr e_pmRA Proper motion in Right Ascension error
160-180 E21.18 mas/yr pmDE Proper motion in Declination
182-201 F20.18 mas/yr e_pmDE Proper motion in Declination error
203-212 F10.7 mag Gmag G band magnitude
214-223 F10.7 mag BPmag ? BP band magnitude
225-234 F10.7 mag RPmag ? RP band magnitude
236-248 E13.9 mag BP-RP ? BP-RP color
250-264 F15.13 -- Delta Delta quantity (Eq. 6) (1)
266-279 F14.12 -- Pmemb Cluster membership probability (Eq. 7)
281-295 A15 -- Class Membership classification
297-302 F6.3 mag MG0proj ? Projected absolute and dereddened Gmag
304-308 F5.3 Msun Mass ? Mass
310-314 I5 K Teff ? Effective temperature
316-329 A14 -- FlagMT Flag regime Mass and Teff
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Note (1): We classify the stars with values of Delta>3 as non members.
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Byte-by-byte Description of file: tablef1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 -- Cluster Cluster Name (G1)
10- 23 A14 -- SourceID ID in catalog of periods (2)
25- 35 F11.8 d Period Period
37- 55 I19 -- GaiaDR2 ? GaiaDR2 ID
57- 70 F14.10 deg RAdeg ? Right ascension (ICRS) at Ep=2015.5
72- 86 F15.11 deg DEdeg ? Declination (ICRS) at Ep=2015.5
88-106 F19.15 mas plx ? Parallax
108-122 F15.13 mas e_plx ? Parallax error
124-141 F18.14 mas/yr pmRA ? Proper motion in Right Ascension
143-157 F15.13 mas/yr e_pmRA ? Proper motion in Right Ascension error
159-176 F18.14 mas/yr pmDE ? Proper motion in Declination
178-192 F15.13 mas/yr e_pmDE ? Proper motion in Declination error
194-203 F10.7 mag Gmag ? G band magnitude
205-214 F10.7 mag BPmag ? BP band magnitude
216-225 F10.7 mag RPmag ? RP band magnitude
227-238 F12.9 mag BP-RP ? BP-RP color
240-245 F6.3 -- Delta ? Delta quantity (Eq. 6)
247-251 F5.3 -- Pmemb ? Cluster membership probability (Eq. 7)
253-267 A15 -- Class Membership classification
269-274 F6.3 mag MG0proj ? Projected absolute and dereddened Gmag
276-280 F5.3 Msun Mass ? Mass
282-286 I5 K Teff ? Effective temperature
288-301 A14 -- FlagMT Flag regime Mass and Teff
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Note (2): Catalog of periods:
EPIC NNNNNNNNN from Rebull et al.,
2016AJ....152..113R 2016AJ....152..113R, Cat. J/AJ/152/113;
2016AJ....152..114R 2016AJ....152..114R, Cat. J/AJ/152/114;
2018AJ....155..196R 2018AJ....155..196R, Cat. J/AJ/155/196
Hartman08 NNNN from Hartman et al., 2008ApJ...675.1233H 2008ApJ...675.1233H, Cat. J/ApJ/675/1233,
Cl* NGC 2099 HGH NNNNNN in Simbad
KIC NNNNNNNN from Santos et al. 2019ApJS..244...21S 2019ApJS..244...21S, Cat. J/ApJS/244/21),
Santos et al., 2021ApJS..255...17S 2021ApJS..255...17S;
Curtis et al., 2019ApJ...879...49C 2019ApJ...879...49C, Cat. J/ApJ/879/49;
Meibom et al., 2011ApJ...733..115M 2011ApJ...733..115M, Cat. J/ApJ/733/115
M50-N-NNN = from Irwin et al., 2009MNRAS.392.1456I 2009MNRAS.392.1456I, Cat. J/MNRAS/392/1456
will be [IAB2009] M50-N-NNNN in Simbad
N2516-N-N-NNNN = from Irwin et al., 2007MNRAS.377..741I 2007MNRAS.377..741I, Cat. J/MNRAS/377/741
[IHA2007] N2516-N-N-NNNN in Simbad
N2547-N-N-NNNN from Irwin et al., 2008MNRAS.383.1588I 2008MNRAS.383.1588I, Cat. J/MNRAS/383/1588
[IHA2008] N2547-N-N-NNNN in Simbad
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Byte-by-byte Description of file: tableg1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 -- Cluster Cluster Name (G1)
10- 12 I3 Myr Age Revised Cluster Age
14- 17 F4.2 Msun Massbin Mass bin
19- 21 I3 -- Nstars Number of stars in Mass bin
23- 28 F6.3 d Period-p10 ? 10th percentile of Period distribution
30- 34 F5.3 d MAD-p10 ? Median Absolute Deviation of 10th
percentile
36- 40 F5.3 d sigma-p10 ? Standard error of 10th percentile
42- 47 F6.3 d Period-p25 25th percentile of Period distribution
49- 53 F5.3 d MAD-p25 Median Absolute Deviation of 25th
percentile
55- 59 F5.3 d sigma-p25 Standard error of 25th percentile
61- 66 F6.3 d Period-p50 50th percentile of Period distribution
68- 72 F5.3 d MAD-p50 Median Absolute Deviation of 50th
percentile
74- 78 F5.3 d sigma-p50 Standard error of 50th percentile
80- 85 F6.3 d Period-p75 75th percentile of Period distribution
87- 91 F5.3 d MAD-p75 Median Absolute Deviation of 75th
percentile
93- 97 F5.3 d sigma-p75 Standard error of 75th percentile
99-104 F6.3 d Period-p90 ? 90th percentile of Period distribution
106-110 F5.3 d MAD-p90 ? Median Absolute Deviation of 90th
percentile
112-116 F5.3 d sigma-p90 ? Standard error of 90th percentile
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Global notes:
Note (G1): Clusters are M37, M50, NGC2516, NGC2547, NGC6811, Pleiades and
Praesepe
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Acknowledgements:
Diego Godoy-Rivera, diego.godoy.rivera(at)iac.es
(End) Patricia Vannier [CDS] 24-Jan-2022