Dynamical masses of young stellar objects with the VLBA: DYNAMO-VLBA: Radio binary stars in Orion
arXiv:2604.22930 · doi:10.1051/0004-6361/202558171
Abstract
We present results from a multi-epoch Very Long Baseline Array (VLBA) survey conducted as part of the DYNAMO-VLBA project, aimed at measuring the dynamical masses of young stellar systems in the Orion complex. Our observations include 19 radio sources associated with 15 binary or multiple young systems. For four visual binaries in which both components were detected, the derived Keplerian orbits yield model-independent stellar masses; in particular, Brun~656 and HD~294300 show excellent agreement between VLBA-based and spectral-energy-distribution-based estimates, providing valuable benchmarks for pre-main-sequence evolutionary models. The component NU Ori C is confirmed as an intermediate-mass (7\,M) star with nonthermal radio emission, offering rare evidence of magnetic activity near the boundary with the high-mass regime. Several additional sources exhibit astrometric accelerations or periodic residuals, revealing unseen companions and extending dynamical constraints to systems with only one radio-emitting component. These results highlight the capability of very long baseline interferometry astrometry to obtain precise and model-independent masses of young binaries, providing critical empirical anchors for stellar evolution models and new insights into the origin of magnetism in intermediate-mass stars.
arXiv comment12 pages, 4 figures, 3 Tables, published in the A&A journal
References in corpus (49)
- Modules for Experiments in Stellar Astrophysics (MESA)
- Gaia Data Release 3: Summary of the content and survey properties
- Correcting for the Effects of Interstellar Extinction
- MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
- The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
- Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
- dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
- A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
- Stellar Multiplicity
- The Revised TESS Input Catalog and Candidate Target List
- astroquery: An Astronomical Web-Querying Package in Python
- Magnetic fields of non-degenerate stars
- The Updated BaSTI Stellar Evolution Models and Isochrones: I. Solar Scaled Calculations
- The APOGEE-2 Survey of the Orion Star Forming Complex II: Six-dimensional structure
- Bayesian model averaging: A systematic review and conceptual classification
- The Pisa pre-main sequence tracks and isochrones. A database covering a wide range of Z, Y, mass, and age values
- A high-resolution spectropolarimetric survey of Herbig Ae/Be stars - I. Observations and measurements
- The Gould's Belt Distances Survey (GOBELINS) II. Distances and structure towards the Orion Molecular Clouds
- Can we predict the global magnetic topology of a pre-main sequence star from its position in the Hertzsprung-Russell diagram?
- PARSEC V2.0: Stellar tracks and isochrones of low and intermediate mass stars with rotation
- VLBA determination of the distance to nearby star-forming regions I. The distance to T Tauri with 0.4% accuracy
- The Gould's Belt Distances Survey (GOBELINS) I. Trigonometric parallax distances and depth of the Ophiuchus complex
- VLBA determination of the distance to nearby star-forming regions IV. A preliminary distance to the proto-Herbig AeBe star EC95 in the Serpens Core
- A Multi-color Optical Survey of the Orion Nebula Cluster. II. the H-R diagram
- A new catalogue of Stroemgren-Crawford uvbybeta photometry
- The Yale-Potsdam Stellar Isochrones (YaPSI)
- ARIADNE: Measuring accurate and precise stellar parameters through SED fitting
- Masses and Luminosities of O and B - type stars and red super giants
- A Giant Outburst at Millimeter Wavelengths in the Orion Nebula
- Identifying Young Stars in Massive Star-Forming Regions for the MYStIX Project
- On the origin of the X-ray emission from Herbig Ae/Be stars
- Discovery of two magnetic massive stars in the Orion Nebula Cluster: a clue to the origin of neutron star magnetic fields?
- The distance to the Orion Nebula Cluster
- VISION - Vienna survey in Orion. III. Young stellar objects in Orion A
- A Deep Chandra X-ray Observation of the Embedded Young Cluster in NGC 2024
- YSOVAR: Six pre-main-sequence eclipsing binaries in the Orion Nebula Cluster
- A spectroscopic census in young stellar regions: the Sigma Orionis cluster
- Multiple Star Systems in the Orion Nebula
- The X-ray emission from Z CMa during an FUor-like outburst and the detection of its X-ray jet
- What happened before? -- The disks around the precursors of young Herbig Ae/Be stars
- A global study of the HII region M43 and its ionizing star (I. Stellar parameters and nebular empirical analysis)
- NU Ori: a hierarchical triple system with a strongly magnetic B-type star
- A VLBA Survey of radio stars in the Orion Nebula Cluster: I. The nonthermal radio population
- A search for strong magnetic fields in massive and very massive stars in the Magellanic Clouds
- A Cluster of Compact Radio Sources in NGC 2024 (Orion B)
- A VLBA Survey of radio stars in the Orion Nebula Cluster: II. Astrometry
- Multi-Epoch VLBI of L Dwarf Binary 2MASS J0746+2000AB: Precise Mass Measurements and Confirmation of Radio Emission from Both Components
- Understanding the angular momentum evolution of T Tauri and Herbig Ae/Be stars
- Dynamical masses of YSOs with the VLBA: DYNAMO VLBA: Trigonometric parallaxes and proper motions of YSOs in Orion