J/ApJ/903/99 Stellar spins in the open cluster NGC 2516 (Healy+, 2020)
Stellar Spins in the Open Cluster NGC 2516.
Healy B.F., McCullough P.R.
<Astrophys. J., 903, 99 (2020)>
=2020ApJ...903...99H 2020ApJ...903...99H
ADC_Keywords: Clusters, open; Optical; Radial velocities; Stars, diameters;
Effective temperatures
Keywords: Open star clusters ; Inclination ; Stellar rotation ; Star
formation
Abstract:
Measuring the distribution of stellar spin axis orientations in a
coeval group of stars probes the physical processes underlying the
stars' formation. In this paper, we use spectrophotometric
observations of the open cluster NGC2516 to determine the degree of
spin alignment among its stars. We combine TESS light curves,
ground-based spectroscopy from the Gaia-ESO and GALAH surveys,
broadband stellar magnitudes from several surveys, and Gaia astrometry
to measure 33 stellar inclinations and quantify overall cluster
rotation. Our measurements suggest that stellar spins in this cluster
are isotropically oriented, while allowing for the possibility that
they are moderately aligned. An isotropic distribution of NGC2516
spins would imply a star-forming environment in which turbulence
dominated ordered motion, while a moderately aligned distribution
would suggest a more substantial contribution from rotation. We also
perform a three-dimensional analysis of the cluster's internal
kinematics, finding no significant signatures of overall rotation.
Stemming from this analysis, we identify evidence of cluster
contraction, suggesting possible ongoing mass segregation in NGC2516.
Description:
We accessed light curves from the PATHOS project (Nardiello+, 2019,
J/MNRAS/490/3806 and 2020, J/MNRAS/495/4924) and the Cluster
Difference Imaging Photometric Survey (CDIPS).
For each cluster star found to have a rotation signature along with a
vsini measurement, we created an SED for fitting to determine the
radius. To build the SED, we used stellar magnitudes from the ALLWISE,
Two Micron All Sky Survey (2MASS), Hipparcos/Tycho-2, and APASS
databases.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 158 Rotation periods of stars with >68% confidence in
NGC2516 membership
table2.dat 140 33 Inclinations and intermediate measurements for 33
NGC2516 stars
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See also:
B/simbad : Simbad objects catalogue (M.Wenger 2000)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
II/328 : AllWISE Data Release (Cutri+ 2013)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/A+A/360/472 : Proper motions in omega Centauri (van Leeuwen+, 2000)
J/A+A/375/863 : Photometry in NGC 2516 (Jeffries+, 2001)
J/AJ/123/290 : UBVI CCD photometry of NGC 2516 (Sung+, 2002)
J/A+A/398/647 : Rotational velocities of F and G stars (Reiners+, 2003)
J/MNRAS/402/1380 : Rotation velocities Pleiades & αPer (Jackson+, 2010)
J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013)
J/A+A/557/L10 : Rotation periods of 12000 Kepler stars (Nielsen+, 2013)
J/ApJ/776/67 : Rotational tracks (van Saders+, 2013)
J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)
J/AJ/150/97 : Radial velocities M67. I. 1278 candid. members (Geller+, 2015)
J/A+A/580/A75 : Velocity precision in the Gaia-ESO Survey (Jackson+, 2015)
J/A+A/586/A52 : NGC 2264, NGC 2547 and NGC 2516 stellar radii (Jackson+, 2016)
J/AJ/153/136 : Planets & their host stars with Gaia plxs (Stassun+, 2017)
J/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018)
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)
J/A+A/616/A12 : Gaia DR2 sources in GC and dSph (Gaia Collaboration+, 2018)
J/A+A/612/L2 : Compilation of stellar rotation data (Kovacs, 2018)
J/A+A/618/A109 : Seismic global parameters of 372 KIC (Mosser+, 2018)
J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)
J/A+A/623/A108 : Age of 269 GDR2 open clusters (Bossini+, 2019)
J/ApJS/245/13 : CDIPS. I. LCs from TESS sectors 6 and 7 (Bouma+, 2019)
J/MNRAS/490/3806 : Exoplanets & variable stars 47 Tuc field (Nardiello+, 2019)
J/MNRAS/495/4924 : Exoplanets in Southern open clusters (Nardiello+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- Gaia Gaia DR2 source ID
21- 38 F18.14 deg RAdeg [117/122] Right Ascension (ICRS 2015.5)
40- 57 F18.14 deg DEdeg [-62/-59] Declination (ICRS 2015.5)
59- 61 F3.1 --- Pmemb [0.7/1] Membership likelihood (<1)
63- 69 F7.4 mag BP-RP [-0.008/2.41] Gaia GBP-GRP color
71- 76 F6.4 mag e_BP-RP [0.001/0.02] Uncertainty in BP-RP
78- 83 F6.4 d Per [0.22/7.3] Period
85- 90 F6.4 d e_Per [0.008/0.7] Uncertainty in Per
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- Gaia Gaia DR2 source ID
21- 38 F18.14 deg RAdeg [118/121] Right Ascension (ICRS 2015.5)
40- 57 F18.14 deg DEdeg [-62/-60] Declination (ICRS 2015.5)
59- 61 F3.1 --- Pmemb [0.7/1] Membership likelihood (<1)
63- 67 F5.2 km/s RVel [20.9/26.6] Radial Velocity
69- 72 F4.2 km/s e_RVel [0.1/4] Uncertainty in RVel
74- 77 I4 K Teff [4080/6490] Effective temperature
79- 81 I3 K e_Teff [99/210] Uncertainty in Teff
83- 87 F5.3 Rsun Rad [0.58/1.38] Radius, solar units
89- 93 F5.3 Rsun e_Rad [0.01/0.03] Uncertainty in Radius
95- 99 F5.2 km/s vsini [5.1/75] Rotational velocity v*sin(i)
101-104 F4.2 km/s e_vsini [0.34/9] Uncertainty in vsini
106-111 F6.4 d Per [0.22/4.26] Period
113-118 F6.4 d e_Per [0.008/0.3] Uncertainty in Per
120-124 F5.3 --- sini [0.38/1.14] Sin of the inclination on the sky
126-130 F5.3 --- E_sini [0.03/0.2] Upper uncertainty on sini
(84th percentile)
132-136 F5.3 --- e_sini [0.02/0.2] Lower uncertainty on sini
(16th percentile)
138-140 A3 --- r_RVel Radial Velocity reference:
Gaia-ESO, Gilmore+, 2012Msngr.147...25G 2012Msngr.147...25G
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie FIX [CDS], 04-Feb-2022