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Análisis cinemático de una eyección coronal de masa de 10 a 46 radios solares
Cremades, H.; Balmaceda, L. A.; Di Lorenzo, L.
In this work we perform the three-dimensional reconstruction (3D) of the morphology of a coronal mass ejection (CME), in the range of heliocentric distances of approximately 10 to 46 solar radii. The event occurs on 2 April 2019, and we use observations made by LASCO-C3 aboard the Solar and Heliospheric Observatory (SOHO), SECCHI-COR2 and HI-1 abo…
An analysis of the twenty-five most distant open clusters
Perren, G. I.; Pera, M. S.; Navone, H. D. +2 more
We present an analysis of the twenty-five open cluster with the largest catalogued distances to the Sun (> 9 kpc). The clusters are selected after cross-matching the four largest published catalogs to date. Distance values in these catalogs show enormous differences between them. The data used to perform the analysis (astrometry and photometry)…
Determinación de los parámetros H y G para 4000 asteroides del catálogo Gaia DR2
Duffard, R.; Colazo, M.; Weidmann, W.
The Gaia mission will provide the scientific community with high- quality observations of ∼ 300,000 asteroids of all categories. The purpose of this work is to obtain a catalog of phase function parameters (H and G) for all the asteroids that are observed by the Gaia mission and which were published in the DR2 catalogue. For this purpose, we intro…
NGC 2660: Gaia DR2, ASteCA and the end of controversies?
Perren, G. I.; Pera, M. S.; Vázquez, R. A. +4 more
NGC 2660, an old and very compact open cluster placed at about 3 kpc from the Sun in a region of moderate absorption, has been subject of several photometric and spectroscopic studies in the past. Controversies arise in terms of its distance, age and metal content. Previous comparisons with cluster synthetic models carried out did not resolve them…
Investigando la zona de los cúmulos inmersos DBS 114-115-117
Baume, G.; Borissova, J.; Ramirez Alegria, S.
A preliminary study of the stellar population has been carried out in the area of the immersed clusters DBS 114, 115 and 117. The information provided by various astronomical databases and data available in the literature has been used. Photometric data in the optical (VPHAS +, GAIA), near infrared (2MASS-VVV) and mid infrared (WISE) has been incl…
Fine structure of the main sequence of NGC 2516 scrutinized with Gaia andASteCA
Perren, G. I.; Pera, M. S.; Navone, H. D. +3 more
The fine structure of the open cluster NGC 2516 is investigated. This is an extended and relatively young open cluster subtending over two degrees in the sky, situated at just a few hundred PARSECs (< 400 pc) from the Sun. We collected Gaia DR2 data (G magnitude down to G=19, BP-RP color index, proper motions, and parallaxes) for more than 400,…
Modeling of emission lines in low-ionization windsof B-type stars
Kraus, M.; Cidale, L. S.; Torres, A. F. +2 more
Motivated by the availability of new observational material provided by Gaia mission, and focused on peculiar B-type stars, we develop a model to simulate the non-LTE line profiles of ionized elements such as Ca II and Mg II. The calculation is performed for a range of effective temperature and surface gravity, for different temperature and veloci…
Comparative study of activity of the near-parabolic orbitcomet C/1977 R1 (Kohler)
de Almeida, A. A.; Sanzovo, G. C.; de Araújo, L. F.
Kohler is considered a case of young, nearly parabolic comet. In this work we deduce, semi-empirically, water and hydroxyl production rates from the photometric observations of this comet taken from the Archive of Photometric Data on Comets and British Astronomical Society archives. Our results are being compared with those obtained from radio obs…
The Orion luminosity/mass function revisited
Peña Ramírez, K.
I present an analysis of the luminosity/mass function of the largest groups identified towards the Orion Complex. Those groups were determined using spectroscopic and astrometric data from APOGEE-2 and Gaia DR2 by applying a hierarchical clustering algorithm to the six-dimensional stellar data. I used Gaussian mixture models to represent the sampl…
Evaluating `twin' parallaxes for binary stars
Jofré, P.; Samadi-Ghadim, A.
Employing Gaia DR2 stellar parallaxes, we tried to first evaluate how `twin parallaxes' are compared with Gaia parallaxes. In the meantime, we checked how different is the performance of twin/Gaia parallaxes for binary stars than for single stars. Our study on a sample of Gaia DR2-RAVE DR5 stars shows that for 70% of them, the twin parallaxes agre…