A New Census of the variable star population in the Globular Cluster NGC 2419

Abstract

We present B, V and I CCD light curves for 101 variable stars belonging to the globular cluster NGC2419, 60 of which are new discoveries, based on datasets obtained at the TNG, SUBARU and HST telescopes. The sample includes 75 RR Lyrae stars (of which 38 RRab, 36 RRc and one RRd), one Population II Cepheid, 12 SX Phoenicis variables, 2 DeltaScuti stars, 3 binary systems, 5 long-period variables, and 3 variables of uncertain classification. The pulsation properties of the RR Lyrae variables are close to those of Oosterhoff type II clusters, consistent with the low metal abundance and the cluster horizontal branch morphology,disfavoring (but not totally ruling out) an extragalactic hypotesis for the origin of NGC2419. The observed properties of RR Lyrae and SX Phoenicis stars are used to estimate the cluster reddening and distance, using a number of different methods. Our final value is mo(NGC2419)=19.71+/-0.08mag (D= 87.5+/-3.3kpc), with E(B-V)=0.08+/-0.01mag, [Fe/H]=-2.1dex in the Zinn & West metallicity scale, and a value of Mv that sets mo(LMC)=18.52mag. This value is in good agreement with most recent literature estimates of the distance to NGC 2419.

26 pages, 16 figures, 4 tables; accepted for publication in AJ

References in corpus (12)

• The nucleus of the Sagittarius dSph galaxy and M54: a window on the process of galaxy nucleation
• Variable stars in the newly discovered Milky Way satellite in Bootes
• Another Non-segregated Blue Straggler Population in a Globular Cluster: the Case of NGC 2419
• The Leo IV dwarf spheroidal galaxy: color-magnitude diagram and pulsating stars
• On the newly discovered Canes Venatici II dSph galaxy
• A delta Scuti distance to the Large Magellanic Cloud
• Pulsating Variable Stars in the Coma Berenices dwarf spheroidal galaxy
• On the remote Galactic globular cluster NGC 2419
• The Blue Hook Populations of Massive Globular Clusters
• The Globular Cluster M15. I. Identification, Discovery, and Period Determination of Variable Stars
• The surface brightness profile of the remote cluster NGC 2419
• Evolved Stars in the Core of the Massive Globular Cluster NGC 2419

Cited by in corpus (41)

• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• Precession of the Sagittarius stream
• N-body modeling of globular clusters: Masses, mass-to-light ratios and intermediate-mass black holes
• On a new theoretical framework for RR Lyrae stars I: the metallicity dependence
• News from the Galactic suburbia: the chemical composition of the remote globular cluster NGC 2419
• From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity
• Do globular clusters possess Dark Matter halos? A case study in NGC 2419
• The globular cluster NGC 2419: a crucible for theories of gravity
• On the distance of the globular cluster M4 (NGC 6121) using RR Lyrae stars: I. optical and near-infrared Period-Luminosity and Period-Wesenheit relations
• Absolute HST Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass
• Weak Galactic halo--dwarf spheroidal connection from RR Lyrae stars
• La Silla QUEST RR Lyrae Star Survey: Region I
• Super AGB and AGB evolution and the chemical inventory in NGC 2419
• On the RR Lyrae stars in globulars: IV. $\omega$ Centauri Optical UBVRI Photometry
• Variable stars in Local Group Galaxies - II. Sculptor dSph
• NGC 2419: a large and extreme second generation in a currently undisturbed cluster
• Stellar Archaeology in the Galactic halo with Ultra-Faint Dwarfs: VII. Hercules
• The VMC survey VII. Reddening map of the 30 Doradus field and the structure of the cold interstellar medium
• Four stellar populations and extreme helium variation in the massive outer-halo globular cluster NGC 2419
• Potassium in globular cluster stars: comparing normal clusters to the peculiar cluster NGC 2419
• Polytropic model fits to the globular cluster NGC 2419 in Modified Newtonian Dynamics
• The power of teaming up HST and Gaia: the first proper motion measurement of the distant cluster NGC 2419
• The VMC Survey -- XLII. Near-infrared period-luminosity relations for RR Lyrae stars and the structure of the Large Magellanic Cloud
• In search of massive single-population Globular Clusters
• Evidence for multiple populations in the massive globular cluster NGC 2419 from deep uVI LBT photometry
• An HST/WFC3 view of stellar populations on the Horizontal Branch of NGC 2419
• Revisiting the variable star population in NGC~6229 and the structure of the Horizontal Branch
• The Luminosity Function and stellar Mass to Light ratio of the massive globular cluster NGC2419
• Calibration of the convective parameters in stellar pulsation hydrocodes
• Homogeneous Photometry VI: Variable Stars in the Leo I Dwarf Spheroidal Galaxy
• The Horizontal Branch of NGC 1851: Constraints from its RR Lyrae Variables
• Variable Stars in Local Group Galaxies. IV. RR Lyrae stars in the central regions of the low-density galaxy Crater II
• Strömgren uvby photometry of the peculiar globular cluster NGC 2419
• The Globular Cluster NGC 6402 (M14). II. Variable Stars
• Hide and seek between Andromeda's halo, disk, and giant stream
• Identifying Contaminated K-band Globular Cluster RR Lyrae Photometry
• The MOND External Field Effect on the Dynamics of the Globular Clusters: General Considerations and Application to NGC 2419
• Multi-wavelength Photometric Study of RR Lyrae Variables in the Globular Cluster NGC 5272 (Messier 3)
• Variability search in M 31 using Principal Component Analysis and the Hubble Source Catalog
• Predicting light curves of RR Lyrae variables using artificial neural network based interpolation of a grid of pulsation models
• The kinematics of star clusters undergoing gas expulsion in Newtonian and Milgromian dynamics