author={J Olivares and L. J. S'anchez and Alex Ruelas-Mayorga and Christine Allen and Rafael Costero and Arcadio Poveda},
  journal={The Astronomical Journal},
Using the novel Diffracto-Astrometry technique, we analyze 44 Hubble Space Telescope Wide Field Planetary Camera 2 images of the Orion Trapezium (OT) taken over a span of 12?yr (1995-2007). We measure the relative positions of the six brighter OT components (A-F) and supplement these results with measurements of the relative separations and position angles taken from the literature, thus extending our analysis time base to ~200 yr. For every pair of components we find the relative rate of… 

Figures and Tables from this paper

Échelle spectroscopy of the chemically peculiar star θ1 Ori F
We analyse Échelle spectra of θ1 Ori F obtained by us on six nights unevenly distributed along 6 yr; we identify several hundred spectral lines and measure, for the first time, the star’s
The 3D Kinematics of the Orion Nebula Cluster: NIRSPEC-AO Radial Velocities of the Core Population
The kinematics and dynamics of stellar and substellar populations within young, still-forming clusters provide valuable information for constraining theories of formation mechanisms. Using Keck II
Redshifted diffuse interstellar bands in the Orion OB1 association
The wavelength displacement of the Diffuse Interstellar Bands at 4502, 5705, 5780, 6284, and 7224 \AA\ with respect to the well known, narrow atomic/molecular interstellar lines (of Ca{\sc ii} and
Orion's Veil. IV. H 2 Excitation and Geometry
The foreground Veil of material that lies in front of the Orion Nebula is the best studied sample of the interstellar medium because we know where it is located, how it is illuminated, and the
Analysis of Selected Runaway Stars in the Orion Nebula Based on Data from the Gaia EDR3 Catalogue
We have performed Monte Carlo simulations of the trajectories of several runaway stars using their parallaxes and proper motions from the Gaia EDR3 catalogue. We have confirmed the hypothesis that
Speckle Interferometry of Nearby Multiple Stars: 2007–2019 Positional Measurements and Orbits of Eight Objects
New data, together with measures already in the literature, made it possible to improve upon previous orbital solutions in six cases and to construct orbits for the first time in the two remaining cases.
The Nature and Frequency of Outflows from Stars in the Central Orion Nebula Cluster
Recent Hubble Space Telescope images have allowed the determination with unprecedented accuracy of motions and changes of shocks within the inner Orion Nebula. These originate from collimated
Multi-epoch observations with high spatial resolution of multiple T Tauri systems
Context. In multiple pre-main-sequence systems the lifetime of circumstellar discs appears to be shorter than around single stars, and the actual dissipation process may depend on the binary
θ 1 Ori C as a Medieval Bully: A Possible Very Recent Ejection in the Trapezium
We use Gaia EDR3 astrometry to propose that a dynamical interaction between the multiple system θ 1 Ori C and θ 1 Ori F ejected the latter as a walkaway star ∼1100 yr ago (without deceleration) or
The Importance of Historical Measures for Dynamical Models of the Evolution of Trapezium-type Multiple Systems
These models were constructed by combining carefully selected historical measures of the separations among components of young massive stellar systems with modern observations and by computing large numbers of fictitious systems resembling real trapezia to simulate the dynamical evolution of such systems.


Dynamical Decay of a Massive Multiple System in Orion KL
We present absolute astrometry of 35 radio sources in the Orion Trapezium and Becklin-Neugebauer/Kleinman-Low (BN/KL) regions, obtained from Very Large Array archival observations collected over a
The distance to the Orion Nebula
We have used the Very Long Baseline Array to measure the trigonometric parallax of several member stars of the Orion Nebula Cluster showing non-thermal radio emission. We have determined the distance
Θ 1 Orionis C - A triple system?
Context. As the brightest star in the Trapezium cluster, Θ 1 Ori C is the youngest and nearest to us among O-stars. It is considered to be a multiple system where the main component is an oblique
Proper Motions and Variabilities of Stars Near the Orion Nebula
Relative proper motions were measured and membership probabilities were determined for over 1000 stars within 15-arcmin of the center of the Orion Nebula, M42. About 900 of the stars are associated
Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region
We present absolute astrometry of four radio sources in the Becklin-Neugebauer/Kleinman-Low (BN/KL) region, derived from archival data (taken in 1991, 1995, and 2000) as well as from new observations
Tracing the young massive high-eccentricity binary system Theta 1 Orionis C through periastron passage
Context. The nearby high-mass star binary system θ 1 Ori C is the brightest and most massive of the Trapezium OB stars at the core of the Orion Nebula Cluster, and it represents a perfect laboratory
A Multi-color Optical Survey of the Orion Nebula Cluster. I. The Catalog
We present U, B, V, I broadband, 6200 A TiO mediumband, and Hα narrowband photometry of the Orion Nebula Cluster (ONC) obtained with the WFI imager at the ESO/MPI 2.2 telescope at La Silla
The Becklin-Neugebauer Object as a Runaway B Star, Ejected 4000 Years Ago from the θ1 Orionis C System
We attempt to explain the properties of the Becklin-Neugebauer (BN) object as a runaway B star, as originally proposed by Plambeck et al. This is one of the best-studied bright infrared sources,
N‐body simulations of stars escaping from the Orion nebula
We study the dynamical interaction in which the two single runaway stars, AE Aurigae and mu Columbae, and the binary iota Orionis acquired their unusually high space velocity. The two single runaways
The Orion Nebula and Its Associated Population
▪ Abstract The Orion Nebula (M 42) is one of the best studied objects in the sky. The advent of multi-wavelength investigations and quantitative high resolution imaging has produced a rapid