Search Publications
On the morphology of open clusters probed by ASteCA using Gaia data
Pera, M. S.; Perrén, G. I.; Navone, H. D. +1 more
We analyze the morphology of over 1000 open clusters scattered in the third and fourth quadrants of the Galaxy, obtaining estimates for their projected two-dimensional ellipticities and rotation angles. Both parameters are closely linked to the formation process and dynamical evolution of these objects. We employed a Bayesian inference method comb…
Bayesian characterization of the young open cluster NGC 6383 using HDBSCAN and Gaia DR3
Pulgar-Escobar, L. M.; Henríquez-Salgado, N. A.
This study focuses on determining the characteristics of the young open cluster NGC 6383. To achieve this, the HDBSCAN clustering algorithm is utilized to identify potential cluster members based on proper motions and parallaxes from Gaia Data Release 3. Various parameters of NGC 6383, such as tidal radius, core radius, distance through parallax a…
Stars, bow shocks, and gamma-ray sources
Benaglia, P.
Here I present a somewhat personal review of the results of my research carried out in the last couple of decades, mostly focused in the fields of stellar astrophysics, the interstellar medium, and the high energy sources. They have been obtained mainly from dedicated interferometric observations in the radio band at low frequencies of the electro…
Determinación de parámetros astrofísicos de cúmulos abiertos a partir de fotometría de GAIA
Simondi-Romero, F. O.; Ahumada, A. V.; Callen, A. R. +5 more
As a continuation of a project within the framework of the General Astrophysics subject (FaMAF, UNC), astrophysical parameters of 4 open clusters of the Milky Way are presented. Based on Gaia DR3 photometric data and fitting theoretical isochrones in the color-magnitude diagrams $(G_{BP}-G_{RP}, G)$, ages, metallicities, distances and color excess…
Primeros resultados del estudio observacional de estrellas masivas y centrales en cúmulos abiertos
González, J. F.; Alejo, A. D.; González, S. P.
Theoretical models show that binary and multiple stars play an important rol in the energetics of open clusters and therefore in their dynamical evolution, particulary in poor clusters dominated by one or a few central massive stars. In this work we present the results of our spectroscopic, astrometric and photometric analysis of four young open c…
El rol de las características y evolución de las regiones activas solares en la producción de fulguraciones y eyecciones coronales de masa
López Fuentes, M.
Solar events such as flares and coronal mass ejections (CMEs) are the most energetic phenomena affecting interplanetary space in timescales from minutes to a few days. With the main aim of establishing parameters to be used in the prediction of phenomena with potential impact on space weather, there has been in recent years a strong interest in de…
Comparison of N-body simulations with Gaia DR3 data from OB associations
Villanova, S.; Assmann, P.; Bascuñán, M. +1 more
Over the years, studies of OB associations have increased due to the fact that more massive stars allow for a better understanding of star formation. Thus, different simulations have been developed with the aim to better understand the main characteristics of these groups and to analyze the different theories about the formation of these associati…
Observaciones fotométricas ópticas de candidatas a galaxias en el survey VVV
González, J. F.; Zarate, F.; Duplancic, F. +4 more
A sample of galaxy candidates observed in the south region of the galactic bulge of Vista Variables in the Via Láctea survey is presented in this work. With the use of the Double Astrograph from the Estación de Altura Carlos Ulrrico Cesco the magnitudes in the visible light of 35 galaxy candidates were obtained. This galaxy candidates were selecte…
A case study of oversight and neglect in the handling of massive data
Pera, M. S.; Vázquez, R. A.; Giorgi, E. E. +2 more
We present and discuss data coming from the Gaia Data Release 3 mission up to $G = 21$ mag in two stellar fields covering about 5 square degrees in the area of the open cluster NGC 2659 in the region of Vela. In combination with the pyUPMASK and ASteCA analysis packages, Gaia data provide membership probabilities, structure and fundamental paramet…
X-rays and TESS observations of symbiotic binary stars
Nuñez, N. E.; Mukai, K.; Sokoloski, J. L. +5 more
Symbiotic stars are strongly interacting binaries composed of a white dwarf accreting from its red giant companion. We studied five symbiotics stars: BD~Cam, V1261~Ori, NQ~Gem, CD~-27~8661, CD~-36~8436 using observations from the Swift/XRT and XMM-Newton satellites in X-rays and from TESS in the optical. The X-ray spectra were fit with absorbed op…