Search Publications
58 open clusters investigated with UBVRI and Gaia eDR3 data
Dias, W. S.; Monteiro, H.; Lépine, J. R. D. +5 more
We present the results of the investigation of 58 open clusters using UBVRI CCD photometry (Johnsons-Cousins system) and Gaia eDR3 data. The membership probability of the stars in the cluster's field was determined from a maximum-likelihood method using Gaia eDR3 astrometric data. The fundamental parameters of the clusters were determined using a …
Spectroscopic study of five SB1 stars with CP components
Giarrusso, M.; Catanzaro, G.; Ferrara, C. +1 more
In this paper, we present the results of a spectroscopic campaign devoted to ascertaining the actual nature of a sample of five objects reported as chemically peculiar stars in the Catalogue of Ap, HgMn and Am stars (2009, A&A, 498, 961). Spectroscopic observations were obtained with Catania Astrophysical Observatory Spectropolarimeter. For ea…
The VVV open cluster project - II. Near-infrared sequences of 37 open clusters on eight-dimensional parameter space
Minniti, D.; Peña Ramírez, K.; Chené, A. -N. +4 more
Open clusters are key coeval structures that help us understand star formation, stellar evolution and trace the physical properties of our Galaxy. In the past years, the isolation of open clusters from the field has been heavily alleviated by the access to accurate large-scale stellar parallaxes and proper motions along a determined line of sight.…
The Common Envelope Origins of the Fast Jet in the Planetary Nebula M 3-38
Guerrero, M. A.; Toalá, J. A.; Rodríguez-López, C. +3 more
We present the analysis of Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía (MEGARA) high-dispersion integral field spectroscopic observations of the bipolar planetary nebula (PN) M 3-38. These observations unveil the presence of a fast outflow aligned with the symmetry axis of M 3-38 that expands with a velocity of up to ±225 km s
Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries
Henning, Thomas; Brandner, Wolfgang; Calissendorff, Per +26 more
Young M-type binaries are particularly useful for precise isochronal dating by taking advantage of their extended pre-main sequence evolution. Orbital monitoring of these low-mass objects becomes essential in constraining their fundamental properties, as dynamical masses can be extracted from their Keplerian motion. Here, we present the combined e…
Digitization, Measurement, and Analysis of a 1905 Barnard Atlas Photographic Plate
Cerny, William; Kron, Richard G.; Martinez, Michael N. +7 more
In the second paper in this series, we improve on our previous demonstration of the ability of a commercially available graphic arts scanner and cost-effective analysis tools to produce scientifically useful scans of astronomical photographic plates. We describe a method using freely available tools to extract magnitude measurements from the star …
Multi-Spacecraft Observations of Fluctuations Occurring Along the Dusk Flank Magnetopause, and Testing the Connection to an Observed Ionospheric Bead
Wing, Simon; Petrinec, Steven M.; Zhang, Yongliang +1 more
During 2018 November 06, 11:30—18:00 UT, the MMS constellation, the Cluster set of spacecraft, and the Geotail spacecraft were all situated near the dusk flank magnetopause. Large scale fluctuations were observed by the available and operating science instruments at these various spacecraft (i.e., magnetic field, plasma moment, and energy flux mea…
Perturbed distribution functions with accurate action estimates for the Galactic disc
Monari, G.; Ramos, P.; Siebert, A. +8 more
In the Gaia era, understanding the effects of the perturbations of the Galactic disc is of major importance in the context of dynamical modelling. In this theoretical paper we extend previous work in which, making use of the epicyclic approximation, the linearized Boltzmann equation had been used to explicitly compute, away from resonances, the pe…
Catalog of Wide Binary, Trinary and Quaternary Candidates from the Gaia Data Release 2 (Region ∣b∣ > 25°)
Zavada, Petr; Píška, Karel
The occurrence of multiple stars, dominantly binaries, is studied using the Gaia-ESA DR2 catalog. We apply the optimized statistical method that we previously developed for the analysis of 2D patterns. The field of stars is divided into a mosaic of small pieces that represent a statistical set for analysis. Specifically, data input is represented …
Observing EAGLE galaxies with JWST: predictions for Milky Way progenitors and their building blocks
Fattahi, Azadeh; Deason, Alis J.; Frenk, Carlos S. +1 more
We present predictions, derived from the EAGLE ΛCDM cosmological hydrodynamical simulations, for the abundance and properties of galaxies expected to be detected at high redshift by the James Webb Space Telescope (JWST). We consider the galaxy population as a whole and focus on the sub-population of progenitors of Milky Way (MW) analogues, defined…