J/AJ/162/197 Photometry, rotation and Li in open cluster NCG2516 (Bouma+, 2021)
Rotation and lithium confirmation of a 500pc halo for the open cluster NGC 2516.
Bouma L.G., Curtis J.L., Hartman J.D., Winn J.N., Bakos G.A.
<Astron. J., 162, 197-197 (2021)>
=2021AJ....162..197B 2021AJ....162..197B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open; Stars, ages; Parallaxes, trigonometric;
Photometry, G band; Proper motions; Radial velocities
Keywords: Stellar associations; Open star clusters; Stellar rotation
Stellar ages; Stellar kinematics
Abstract:
Recent analyses of the Gaia data have identified diffuse stellar
populations surrounding nearby open clusters. It is important to
verify that these "halos," "tails," and "strings" are of similar ages
and compositions as stars in the denser part of the cluster. We
present an analysis of NGC2516 (∼150Myr), which has a classical tidal
radius of 10pc and an apparent halo of stars spanning 500pc (20°
on-sky). Combining photometry from Gaia, rotation periods from TESS,
and lithium measurements from Gaia-ESO and GALAH, we find that the
halo of NGC2516 is the same age as the cluster's core. Two-thirds of
kinematically selected halo members out to 250pc from the cluster
center have rotation periods consistent with a gyrochronological age
of 150Myr. A comparison sample of field stars shows no such trend. The
lithium abundances of stars in the halo are higher than in the field
and correlated with the stellar rotation rate and binarity fraction,
as has been noted in other young open clusters. Broadly speaking, this
work supports a new paradigm wherein the halos of open clusters are
often more populous than their cores. We highlight implications for
spectroscopic survey targeting, open cluster dispersal, and planet
searches around young stars.
Description:
We combined photometry from Gaia, rotation periods from TESS, and
lithium measurements from Gaia-ESO and GALAH (de Silva+,
2015MNRAS.449.2604D 2015MNRAS.449.2604D) to study the structure of NGC2516.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 227 3298 Rotation periods and lithium equivalent widths
for 3298 candidate NGC2516 members
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/A+A/556/A15 : Effective temperature scale of M dwarfs (Rajpurohit+, 2013)
J/A+A/558/A53 : Milky Way global survey star clusters. II. (Kharchenko+, 2013)
J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/ApJ/809/77 : Transiting Exoplanet Survey Satellite (TESS) (Sullivan+, 2015)
J/AJ/152/113 : Pleiades members K2 light curves. I. Periods (Rebull+, 2016)
J/AJ/152/115 : Pleiades members with K2 light curves. III. (Stauffer+, 2016)
J/MNRAS/461/794 : Scorpius-Centaurus K-Type Stars (Pecaut+, 2016)
J/AJ/153/101 : Pleiades members stellar properties (Somers+, 2017)
J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)
J/AJ/155/196 : Analysis of K2 LCs for members USco & ρOph (Rebull+, 2018)
J/ApJ/842/83 : Praesepe memb rotational periods from K2 LCs (Douglas+, 2017)
J/A+A/612/A99 : Gaia-ESO Survey in 7 open star cluster fields (Randich+, 2018)
J/A+A/613/A63 : Lithium content for 148 Pleiades stars (Bouvier+, 2018)
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)
J/A+A/619/A106 : 3D shape of Orion A from Gaia DR2 (Grossschedl+, 2018)
J/A+A/620/A172 : Solar neighbourhood young stars 3D mapping (Zari+, 2018)
J/AJ/156/18 : APOGEE DR14:Binary comp of evolved stars (Price-Whelan+, 2018)
J/AJ/156/84 : APOGEE-2 survey of Orion Complex. II. (Kounkel+, 2018)
J/ApJ/855/115 : Lithium abundances of KOIs from CKS spectra (Berger+, 2018)
J/ApJ/860/43 : BANYAN. XII. New members from Gaia-Tycho data (Gagne+, 2018)
J/ApJ/862/138 : BANYAN. XIII. Nearby young assoc. with Gaia DR2 (Gagne+, 2018)
J/MNRAS/475/1609 : RV variability in NGC 2516 and NGC 2422 (Bailey+, 2018)
J/A+A/621/L2 : Hyades tidal tails revealed by Gaia DR2 (Roeser+, 2019)
J/A+A/621/L3 : Hyades tidal tails with Gaia DR2 (Meingast+, 2019)
J/A+A/622/L13 : Stellar stream in Gaia DR2 discovery (Meingast+, 2019)
J/A+A/624/L11 : Coma Berenices neighbor moving group (Fuernkranz+, 2019)
J/A+A/626/A17 : Young population in Vela-Puppis region (Cantat-Gaudin+, 2019)
J/AJ/158/77 : Candidates & members of Pisces-Eridanus stream (Curtis+, 2019)
J/AJ/158/122 : Local structure & star formation history MW (Kounkel+, 2019)
J/ApJ/871/174 : Kepler rapid rotators and Ks-band excesses (Simonian+, 2019)
J/ApJ/877/12 : Coma Ber & a Neighbor Stellar Group tidal tails (Tang+, 2019)
J/ApJ/879/49 : Rotation periods 171 Gaia members of NGC6811 (Curtis+, 2019)
J/ApJ/879/100 : K2 rotation periods Hyades & Praesepe members (Douglas+, 2019)
J/ApJS/245/13 : CDIPS. I. LCs from TESS sectors 6 and 7 (Bouma+, 2019)
J/A+A/634/A34 : Complete line list and solar values (Baratella+, 2020)
J/A+A/641/A51 : NGC 2516 membership list (Fritzewski+, 2020)
J/AJ/160/239 : Cluster diff imaging photometric survey. II. (Bouma+, 2020)
J/AJ/160/279 : Untangling Galaxy. II. Structure within 3kpc (Kounkel+, 2020)
J/MNRAS/496/2422 : Abundances 42 Pisces-Eridanus stream stars (Hawkins+, 2020)
J/A+A/645/A84 : Coronae of nearby star clusters (Meingast+, 2021)
J/A+A/646/A104 : Improving the open cluster census. I. (Hunt+, 2021)
J/A+A/647/A137 : 800pc tital tail of Hyades (Jerabkova+, 2021)
J/AJ/161/65 : THYME. IV. 3 Exoplanets around TOI-451 B (Newton+, 2021)
J/AJ/161/171 : THYME. V. Discovering new stellar associa. (Tofflemire+, 2021)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 source identifier (1)
21- 39 I19 --- GaiaEDR3 Gaia EDR3 source identifier
41- 41 I1 --- inSetA [0/1] source in Set A? (2)
43- 43 I1 --- inSetB [0/1] source in Set B? (2)
45- 46 I2 --- Ncdips [0/13] Number of TESS sectors with CDIPS
light curve
48- 54 F7.4 d Per [0.05/30]? Lomb-Scargle best period
56- 61 F6.4 --- lspval [0.005/0.95]? Lomb-Scargle periodogram value
for best period
63- 63 I1 --- Nequal [0/4]? Number of stars brighter than the
target in TESS aperture (3)
65- 65 I1 --- Nclose [1/7]? Number of stars with ΔT>1.25 in
TESS aperture (3)
67- 67 I1 --- Nfaint [1/7]? Number of stars with ΔT>2.5 in
TESS aperture (3)
69- 82 F14.10 deg RAdeg [25.4/147.7] GaiaDR2 Right Ascension (ICRS)
84- 97 F14.10 deg DEdeg [-88.7/-47.6] GaiaDR2 Declination (ICRS)
99-104 F6.1 --- Epoch [2015.5] Reference epoch for right ascension
and declination
106-110 F5.3 mas plx [1.23/4.87] Gaia DR2 parallax
112-116 F5.3 mas e_plx [0.01/0.4] Uncertainty for plx
118-124 F7.3 mas/yr pmRA [-10.6/25.8] Gaia DR2 Proper motion in Right
Ascension (µRA*cos(DE))
126-131 F6.3 mas/yr pmDE [3.61/27.4] Gaia DR2 Proper motion in
Declination (µDE)
133-138 F6.3 mag Gmag [4.19/19.3] Gaia DR2 G-band magnitude
140-145 F6.3 mag BPmag [5.46/20.9]? Gaia DR2 BP magnitude
147-152 F6.3 mag RPmag [3.28/18]? Gaia DR2 RP magnitude
154-159 F6.2 km/s RVel [-19.4/58.2]? Gaia DR2 heliocentric radial
velocity
161-165 F5.2 km/s e_RVel [0.1/18]? Uncertainty in HRVel
167-170 A4 --- Subc Is star in core (CG18) or halo (KC19+M21) (4)
172-172 I1 --- inCG18 [0/1] Star in Cantat-Gaudin+, 2018,
J/A+A/618/A93
174-174 I1 --- inKC19 [0/1] Star in Kounkel & Covey, 2019,
J/AJ/158/122
176-176 I1 --- inM21 [0/1] Star in Meingast+, 2021, J/A+A/645/A84
178-183 F6.3 mag BP-RP [-0.27/3.12]? Dereddened Gaia DR2 BP-RP color
(5)
185-185 I1 --- phot-bin [0/1] True if >0.3mag above cluster isochrone
187-187 I1 --- astrm-bin [0/1] True if Gaia EDR3 RUWE>1.2
189-194 F6.3 --- RUWE [0.68/15.7] Gaia EDR3 RUWE
196-200 F5.1 0.1pm EWLi-Gaia [-95.3/306]? Gaia-ESO Li doublet equivalent
width (6)
202-206 F5.1 0.1pm E_EWLi-Gaia [5/105]? upper uncertainty EWLi-GaiaESO
208-211 F4.1 0.1pm e_EWLi-Gaia [5/68]? lower uncertainty EWLi-GaiaESO
213-217 F5.1 0.1pm EWLi-GALAH [-12/308]? GALAH Li doublet equivalent width
(6)
219-222 F4.1 0.1pm E_EWLi-GALAH [5/59]? upper uncertainty EWLi-GALAH
224-227 F4.1 0.1pm e_EWLi-GALAH [5/40]? lower uncertainty EWLi-GALAH
--------------------------------------------------------------------------------
Note (1): This table is a concatenation of all candidate NGC 2516
members reported by Cantat-Gaudin+, (2018, J/A+A/618/A93), Kounkel &
Covey (2019, J/AJ/158/122), Meingast+, (2021, J/A+A/645/A84) based on
the Gaia DR2 data.
Note (2): Different levels of purity and completeness can be achieved using
different cuts on photometric periods, periodogram powers, and lithium
equivalent widths. Sets A and B provide two possible levels of cleaning
(see Section 3.2.1):
Set A=lspval>0.08, Per<15d, nequal ≡ 0, nclose ≥ 1;
Set B = Set A and below Pera (BP-RP) cut.
Note (3): When the target star is the only star present in the TESS aperture,
nequal= 0, nclose= 1, and nfaint= 1.
Note (4): Is star in core (Cantat-Gaudin+, (2018, J/A+A/618/A93)) or
halo (Kounkel & Covey (2019, J/AJ/158/122) plus
Meingast+, (2021, J/A+A/645/A84)?
Note (5): Gaia BP-RP color, minus E(BP-RP)=0.1343
Note (6): Li doublet equivalent width includes the Fe blend
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 10-Jan-2022