Asteroseismology of the young open cluster NGC 2516 I: Photometric and spectroscopic observations

Abstract

Asteroseismic modelling of isolated star presents significant challenges due to the difficulty in accurately determining stellar parameters, particularly the stellar age. These challenges can be overcomed by observing stars in open clusters, whose coeval members share an initial chemical composition. The light curves by TESS allow us to investigate and analyse stellar variations in clusters with an unprecedented level. We aim to detect gravity-mode oscillations in the early-type main-sequence members of the young open cluster NGC 2516. We selected the 301 member stars as our sample and analysed the TESS FFI light curves. We also collected high-resolution spectra using the FEROS for the g-mode pulsators. By fitting the theoretical isochrones to the colour-magnitude diagram (CMD) of a cluster, we determined an age of 102 $\pm$ 15 Myr and inferred the extinction at 550 nm ($A_0$) is 0.53 $\pm$ 0.04 mag. We identified 147 stars with surface brightness modulations, 24 with g-mode pulsations ($\gamma$ Doradus or Slowly Pulsating B stars), and 35 with p-mode pulsations ($\delta$ Sct stars). When sorted by colour index, the amplitude spectra of the $\delta$ Sct stars show a distinct ordering and reveal a discernible frequency-temperature relationship. The near-core rotation rates, measured from period spacing patterns in two SPB and nine $\gamma$ Dor stars, reach up to 3/d . This is at the high end of the values found from Kepler data of field stars of similar variability type. The $\gamma$ Dor stars have internal rotation rates as high as 50% of their critical value, whereas the SPB stars exhibit rotation rates close to their critical rate. We did not find long-term brightness and colour variations in the mid-infrared, which suggests that there are no disk or shell formation events in our sample. We also discussed the results of our spectroscopic observations for the g-mode pulsators.

arXiv commentAccepted to be published by A&A. 15 figures and 3 tables in the main paper, 51 figures and 1 table in the appendix

References in corpus (138)

• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The chemical composition of the Sun
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Modules for Experiments in Stellar Astrophysics (MESA)
• Gaia Data Release 3: Summary of the content and survey properties
• The Transiting Exoplanet Survey Satellite
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• The Revised TESS Input Catalog and Candidate Target List
• Ages for illustrative field stars using gyrochronology: viability, limitations and errors
• astroquery: An Astronomical Web-Querying Package in Python
• Gaia Early Data Release 3: Photometric content and validation
• Multiple populations in globular clusters. Lessons learned from the Milky Way globular clusters
• Rotation Periods of 34,030 Kepler Main-Sequence Stars: The Full Autocorrelation Sample
• On the rotational evolution of solar- and late-type stars, its magnetic origins, and the possibility of stellar gyrochronology
• A Gaia DR2 view of the Open Cluster population in the Milky Way
• GYRE: An open-source stellar oscillation code based on a new Magnus Multiple Shooting Scheme
• Gaia Data Release 2: first stellar parameters from Apsis
• Spin down of the core rotation in red giants
• Seismic constraints on the radial dependence of the internal rotation profiles of six Kepler subgiants and young red giants
• Asteroseismology of old open clusters with Kepler: direct estimate of the integrated RGB mass loss in NGC6791 and NGC6819
• Probing the interior physics of stars through asteroseismology
• On the use of Gaia magnitudes and new tables of bolometric corrections
• Angular Momentum Transport in Stellar Interiors
• Gravity darkening in rotating stars
• Rotational velocities of A-type stars. III. Velocity distributions
• Gamma Doradus Stars: Defining a New Class of Pulsating Variables
• CERES: A Set of Automated Routines for Echelle Spectra
• Asteroseismology of 16000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii
• Asteroseismic measurement of surface-to-core rotation in a main sequence A star, KIC 11145123
• The Effect of Stellar Rotation on Colour-Magnitude Diagrams: On the apparent presence of multiple populations in intermediate age stellar clusters
• The spinning-top Be star Achernar from VLTI-VINCI
• The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
• Angular momentum transport by heat-driven g-modes in slowly pulsating B stars
• First Results from the CHARA Array. I. An Interferometric and Spectroscopic Study of the Fast Rotator alpha Leonis (Regulus)
• Asteroseismic measurement of slow, nearly-uniform surface-to-core rotation in the main sequence F star KIC 9244992
• Seismic evidence for a weak radial differential rotation in intermediate-mass core helium burning stars
• General Cosmography Model with Spatial Curvature
• {\em Gaia}-derived luminosities of {\em Kepler} A/F stars and the pulsator fraction across the δ Scuti instability strip
• Internal mixing of rotating stars inferred from dipole gravity modes
• Core rotation braking on the red giant branch for various mass ranges
• Sounding open clusters: asteroseismic constraints from Kepler on the properties of NGC 6791 and NGC 6819
• A unifying explanation of complex frequency spectra of gamma Dor, SPB and Be stars: combination frequencies and highly non-sinusoidal light curves
• 3D kinematics and age distribution of the Open Cluster population
• A new asteroseismic diagnostic for internal rotation in $\gamma$ Doradus stars
• A comparison of evolutionary tracks for single Galactic massive stars
• Characterising the observational properties of δ Sct stars in the era of space photometry from the Kepler mission
• Theory and evidence of global Rossby waves in upper main-sequence stars: r-mode oscillations in many Kepler stars
• Turbulent convection and pulsation stability of stars - II. Theoretical instability strip for $\delta$ Scuti and $\gamma$ Doradus stars
• Extended stellar systems in the solar neighborhood -- V. Discovery of coronae of nearby star clusters
• Very regular high-frequency pulsation modes in young intermediate-mass stars
• Extended stellar systems in the solar neighborhood - I. The tidal tails of the Hyades
• γ Doradus stars as test of angular momentum transport models
• Forward asteroseismic modeling of stars with a convective core from gravity-mode oscillations: parameter estimation and stellar model selection
• The shape of convective core overshooting from gravity-mode period spacings
• First direct detection of a Keplerian rotating disk around the Be star $\alpha$ Arae using the VLTI/AMBER instrument
• Asteroseismic masses, ages, and core properties of $\gamma$ Doradus stars using gravito-inertial dipole modes and spectroscopy
• Internal rotation of the red-giant star KIC 4448777 by means of asteroseismic inversion
• The internal rotation profile of the B-type star KIC10526294 from frequency inversion of its dipole gravity modes and statistical model comparison
• The role of turbulent pressure as a coherent pulsational driving mechanism: the case of the delta Scuti star HD 187547
• Detecting non-uniform period spacings in the Kepler photometry of gamma Doradus stars: methodology and case studies
• Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results
• Rotating Stellar Models Can Account for the Extended Main Sequence Turnoffs in Intermediate Age Clusters
• Extended Main Sequence Turnoffs in Open Clusters as Seen by Gaia: I. NGC 2818 and the Role of Stellar Rotation
• The Monitor project: Rotation periods of low-mass stars in M50
• Stellar mergers as the origin of the blue main-sequence band in young star clusters
• KIC 10526294: a slowly rotating B star with rotationally split, quasi-equally spaced gravity modes
• The empirical Gaia G-band extinction coefficient
• KIC 3240411 - the hottest known SPB star with the asymptotic g-mode period spacing
• Period spacings of $\gamma$ Doradus pulsators in the \textit{Kepler} field: Rossby and gravity modes in 82 stars
• Rotation of the convective core in $\gamma$ Dor stars measured by dips in period spacings of g modes coupled with inertial modes
• Seismic evidence for near solid-body rotation in two Kepler subgiants and implications for angular momentum transport
• Asteroseismic inferences on red giants in open clusters NGC 6791, NGC 6819 and NGC 6811 using Kepler
• Detection of solar-like oscillations from Kepler photometry of the open cluster NGC 6819
• Period spacings of $\gamma$ Doradus pulsators in the Kepler field: detection methods and application to 22 slow rotators
• Deciphering the oscillation spectrum of $\gamma$ Doradus and SPB stars
• First evidence of inertial modes in $\gamma$ Doradus stars: The core rotation revealed
• Constraining stellar evolution theory with asteroseismology of $\gamma$ Doradus stars using deep learning
• Probing the temperature gradient in the core boundary layer of stars with gravito-inertial modes: the case of KIC7760680
• Rotation and activity in the solar-metallicity open cluster NGC2516
• A precise asteroseismic age and metallicity for HD 139614: a pre-main-sequence star with a protoplanetary disc in Upper-Centaurus Lupus
• Gaia Data Release 3: Pulsations in main sequence OBAF-type stars
• A Young Cluster With an Extended Main Sequence Turnoff: Confirmation of a Prediction of the Stellar Rotation Scenario
• Structural Parameters of Seven SMC Intermediate-Age and Old Star Clusters
• Internal rotation of 13 low-mass low-luminosity red giants in the Kepler field
• The effect of tides on near-core rotation: analysis of 35 Kepler $\gamma$ Doradus stars in eclipsing and spectroscopic binaries
• Combined Effects of Rotation and Age Spreads on Extended Main Sequence Turn Offs
• An astrophysical interpretation of the remarkable g-mode frequency groups of the rapidly rotating $\gamma$ Dor star, KIC 5608334
• Gaia Data Release 3: Properties of the line broadening parameter derived with the Radial Velocity Spectrometer (RVS)
• Extended main-sequence turnoffs in the double cluster $h$ and $\chi$ Persei: The complex role of stellar rotation
• Rotation and Lithium Confirmation of a 500 Parsec Halo for the Open Cluster NGC 2516
• A realistic two-dimensional model of Altair
• On the first $\delta$ Sct--roAp hybrid pulsator and the stability of p and g modes in chemically peculiar A/F stars
• An extended main sequence turn-off in the Small Magellanic Cloud star cluster NGC411
• Transport of angular momentum by stochastically excited waves as an explanation for the outburst of the rapidly rotating Be star HD49330
• The rotation period distribution of the rich Pleiades-age Southern open cluster NGC 2516. Existence of a representative zero-age main sequence distribution
• TESS observations of the Pleiades cluster: a nursery for delta Scuti stars
• Formation of new stellar populations from gas accreted by massive young star clusters
• Detection of nonlinear resonances among gravity modes of slowly pulsating B stars: results from five iterative prewhitening strategies
• Asteroseismic modeling of gravity modes in slowly rotating A/F stars with radiative levitation
• New Constraints on the Star Formation History of the Star Cluster NGC 1856
• Isochrone-cloud fitting of the extended Main-Sequence Turn-Off of young clusters
• Five young $\delta$ Scuti stars in the Pleiades seen with Kepler/K2
• Detection of period-spacing patterns due to the gravity modes of rotating dwarfs in the TESS southern continuous viewing zone
• Echelle diagrams and period spacings of g modes in gamma Doradus stars from four years of Kepler observations
• Predictions for gravity-mode periods and surface abundances in intermediate-mass dwarfs from shear mixing and radiative levitation
• Astrophysical properties of 15062 Gaia DR3 gravity-mode pulsators: pulsation amplitudes, rotation, and spectral line broadening
• Asteroseismic g-mode period spacings in strongly magnetic rotating stars
• Stellar Spins in the Open Cluster NGC 2516
• The first two-dimensional stellar structure and evolution models of rotating stars
• The effect of the centrifugal acceleration on period spacings of gravito-inertial modes in intermediate-mass stars
• Delta Scuti Variables
• Asteroseismology of the Hyades with K2: first detection of main-sequence solar-like oscillations in an open cluster
• Internal rotation and buoyancy travel time of 60 gamma Doradus stars from uninterrupted TESS light curves spanning 352 days
• Kepler observations of A-F pre-main sequence stars in Upper Scorpius: Discovery of six new $\delta$~Scuti and one $\gamma$~Doradus stars
• Extended main sequence turn-off originated from a broad range of stellar rotational velocities
• Age-dating the young open cluster UBC 1 with g-mode asteroseismology, gyrochronology, and isochrone fitting
• Calibrating angular momentum transport in intermediate-mass stars from gravity-mode asteroseismology
• An asteroseismic age estimate of the open cluster NGC 6866 using Kepler and Gaia
• Variability in the Massive Open Cluster NGC 1817 from K2: A Rich Population of Asteroseismic Red Clump, Eclipsing Binary, and Main Sequence Pulsating Stars
• Asteroseismology of the dip structure in period-spacings of rapidly rotating gamma Doradus stars caused by the coupling between core and envelope oscillations
• Frequency analysis of Delta Scuti stars towards the Galactic bulge
• Dating young open clusters using delta Scuti stars. Results for Trumpler 10 and Praesepe
• Analysis of high-resolution FEROS spectroscopy for a sample of variable B-type stars assembled from TESS photometry
• Search for low instability strip variables in the young open cluster NGC 2516
• Quiescent and active phases in Be stars: A WISE snapshot of young galactic open clusters
• A simple method to measure numax for asteroseismology: application to 16,000 oscillating Kepler red giants
• Asteroseismic age constraints on the open cluster NGC 2477 using oscillating stars identified with TESS FFI
• Mode coupling coefficients between the convective core and radiative envelope of $\gamma$Doradus and slowly pulsating B stars
• Exploring Be phenomena in OBA stars: a Mid-infrared search
• HD 42477: coupled r modes, g modes and a p mode in an A0Vnne star

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