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Parámetros astrofísicos de cúmulos abiertos ubicados en el tercer y cuarto cuadrante de la Galaxia
Baracchi, M. A.; Colazo, A. D. V.; Rodríguez-Buss, C. M. +7 more
As part of new project in the framework of the activities of the subject `Astrofísica General} (FaMAF, UNC), we present astrophysical parameters of open clusters located in the third and fourth Galactic quadrant: NGC 2243, NGC 2439, Pi 12, Tr 13 and NGC 5168. Based on Gaia DR3 photometric data and fitting theoretical isochrones to the color-magnit…
NGC 2659: a probable binary cluster
Perren, G. I.; Pera, M. S.; Giorgi, E. E. +2 more
We present and discuss photometric data, proper motions and parallaxes in a field of a 30'x30' centred in the area centered in the open cluster NGC 2659 in the region of Vela. In recent papers on the same region evidences of the presence of another cluster close to the north-east of NGC 2659 have been reported. Data were extracted from Gaia EDR3 a…
Parámetros estructurales de cúmulos abiertos y su comportamiento en presencia de compañeros cercanos
Baume, G.; Rodríguez, M. J.; Feinstein, C. +3 more
The study of a relevant and homogeneous sample of open clusters is presented with the aim of analysing the internal structure in clusters that are part of binary or multiple systems. In the applied procedure we used the astrometric and photomeric data provided by the Gaia survey (DR2) and the membership probabilities of its members obtained from c…
Generating a unified catalogue of open clusters and their most probable members
Perren, G. I.; Pera, M. S.; Navone, H. D. +1 more
In this work we present the largest database of open clusters catalogued to date. To obtain it we combine almost a dozen existing databases of open clusters to generate a cross-matched list of more than 5000 unique objects, scattered throughout the Galaxy. In addition, we process around 2000 of these clusters with a new membership algorithm code; …
Caracterización del sistema HD 196385 mediante imagen directa, velocidad radial y astrometría
García, L. H.; Petrucci, R.; Jofré, E. +1 more
In this paper we present a characterization of the relative orbit of HD 196385B combining data from direct imaging, radial velocity, and proper motions from the Hipparcos and Gaia missions. To perform a joint fit of the data, we used the code orvara. From the fit, we obtained ranges of possible values for the major semi-axis, the mass of the secon…
White-dwarf asteroseismology with the TESS space telescope
Córsico, A. H.
As white-dwarf (WD) stars cool, they go through one or more stages of g(gravity)-mode pulsational instability, becoming multiperiodic variable stars. Stars passing through these instability domains allow astronomers to study their interiors through asteroseismological techniques, as if they could ``look'' at their interiors by analyzing the spectr…
The Galaxy structure across the Vela Gum
Pera, M. S.; Vázquez, R. A.; Giorgi, E. E. +3 more
We present first and preliminary results of a study on the open cluster population seen against the Gum Nebula. This is a very large and nearby emission gas structure covering from l=240° to l=270° and from b=+8° to b=-15°, approximately. Taking advantage of the impressive precision and depth (G≈ 20) of data provided by the Gaia mission (EDR3) and…
A study of the Galactic HI supershell GS 121-05-037
Molina Lera, J. A.; Cichowolski, S.; Suad, L. A.
GS 121-05-037 is a Galactic supershell located in the outer part of the Galaxy at (l, b) ∼ (121.°3, - 4.°8) at a distance of 3.2 ± 1 kpc from the Sun. In this work we estimated the kinetic energy of the feature to determine its possible origin. Several catalogued H II regions are located projected towards the supershell. With the aim of determinin…
X-ray emission from the microquasar S26 observed by XMM-Newton
Romero, G. E.; Rizzo, F. N.; Sotomayor Checa, P.
S26 is the microquasar with the most powerful jets observed in accreting stellar sources. The estimated kinetic power for its jets is of the order of the bolometric luminosity of some ultraluminous X-ray sources. If this power is coupled to the matter accretion onto the compact object, then S26 must be a super-accreting binary, similar to the gala…
Observaciones del remanente de supernova G296.5+10.0 con el satélite XMM-Newton
Combi, J. A.; Eppens, L. K.; Reynoso, E. M.
G296.5+10.0 is a 90' × 65'-size supernova remnant (SNR) that displays a bilateral distribution in the radio band with the symmetry axis perpendicular to the Galactic Plane. The remnant shows two emission peaks at the South-East and South-West of the radio shell. In addition, the EXOSAT instrument detected an extended X-ray plasma with an axisymmet…