Orbital Parameters and Binary Properties of 37 FGK stars in the Cores of Open Clusters NGC 2516 and NGC 2422
arXiv:2110.01815 · doi:10.3847/1538-3881/ac2ccd
Abstract
We present orbits for 24 binaries in the field of open cluster NGC 2516 (~150 Myr) and 13 binaries in the field of open cluster NGC 2422 (~130 Myr) using results from a multi-year radial velocity survey of the cluster cores. Six of these systems are double-lined spectroscopic binaries (SB2s). We fit these RV variable systems with orvara, a MCMC-based fitting program that models Keplerian orbits. We use precise stellar parallaxes and proper motions from Gaia EDR3 to determine cluster membership. We impose a barycentric radial velocity prior on all cluster members; this significantly improves our orbital constraints. Two of our systems have periods between 5 and 15 days, the critical window in which tides efficiently damp orbital eccentricity. These binaries should be included in future analyses of circularization across similarly-aged clusters. We also find a relatively flat distribution of binary mass ratios, consistent with previous work. With the inclusion of TESS lightcurves for all available targets, we identity target 378-036252 as a new eclipsing binary. We also identify a field star whose secondary has a mass in the brown dwarf range, as well as two cluster members whose RVs suggest the presence of an additional companion. Our orbital fits will help constrain the binary fraction and binary properties across stellar age and across stellar environment.
arXiv comment38 pages, 47 figures (incl. 37 Appendix figures), 4 tables. AJ accepted
References in corpus (44)
- Astropy: A Community Python Package for Astronomy
- emcee: The MCMC Hammer
- The Gaia mission
- The Transiting Exoplanet Survey Satellite
- Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
- A Survey of Stellar Families: Multiplicity of Solar-Type Stars
- Accurate masses and radii of normal stars: modern results and applications
- Stellar Multiplicity
- Gaia Early Data Release 3: The astrometric solution
- Young massive star clusters
- Global survey of star clusters in the Milky Way II. The catalogue of basic parameters
- A Gaia DR2 view of the Open Cluster population in the Milky Way
- Astrophysical parameters of Galactic open clusters
- How Dry is the Brown Dwarf Desert?: Quantifying the Relative Number of Planets, Brown Dwarfs and Stellar Companions around Nearby Sun-like Stars
- Dynamic temperature selection for parallel-tempering in Markov chain Monte Carlo simulations
- A Robust Measure of Tidal Circularization in Coeval Binary Populations: The solar-type spectroscopic Binary Population in The Open Cluster M35
- eleanor: An open-source tool for extracting light curves from the TESS Full-Frame Images
- Efficient fitting of multiplanet Keplerian models to radial velocity and astrometry data
- The Open Cluster Chemical Abundances and Mapping Survey: IV. Abundances for 128 Open Clusters using SDSS/APOGEE DR16
- Dynamical Evolution and Spatial Mixing of Multiple Population Globular Clusters
- Stellar Multiplicity Meets Stellar Evolution And Metallicity: The APOGEE View
- Binaries Like to be Twins: Implications for Doubly Degenerate Binaries, the Supernova Ia Rate and Other Interacting Binaries
- Observational Evidence for Tidal Interaction in Close Binary Systems
- Close companions around young stars
- orvara: An Efficient Code to Fit Orbits using Radial Velocity, Absolute, and/or Relative Astrometry
- Photometry and membership for low mass stars in the young open cluster NGC 2516
- Direct N-Body Modeling of the Old Open Cluster NGC 188: A Detailed Comparison of Theoretical and Observed Binary Star and Blue Straggler Populations
- The fraction of binary systems in the core of five Galactic open clusters
- A high binary fraction for the most massive close-in giant planets and brown dwarf desert members
- Wide binaries are rare in open clusters
- The incidence of binaries in Globular Cluster stellar populations
- The Tidal Circularization Cutoff Period of the Old Open Cluster NGC188
- Stellar Radial Velocities in the Old Open Cluster M67 (NGC 2682). II. The Spectroscopic Binary Population
- Binaries in star clusters and the origin of the field stellar population
- Open Cluster Chemical Homogeneity Throughout the Milky Way
- The rotation period distribution of the rich Pleiades-age Southern open cluster NGC 2516. Existence of a representative zero-age main sequence distribution
- Spectroscopic Binaries in the Orion Nebula Cluster and NGC 2264
- Twins Among the Low Mass Spectroscopic Binaries
- WIYN Open Cluster Study. LXXVII. Radial-Velocity Measurements and Spectroscopic Binary Orbits in the Open Cluster NGC 7789
- Luminosity and Mass Function of the Galactic open cluster NGC 2422
- Binary Star Disruption in Globular Clusters with Multiple Stellar Populations
- Different Dynamical Ages for the Two Young and Coeval LMC Star Clusters NGC 1805 and NGC 1818 Imprinted on Their Binary Populations
- Massive, wide binaries as tracers of massive star formation
- Multiplexing Precision RVs: Searching for Close in Gas Giants in Open Clusters