We present a study of the internal structure of 82 star clusters located at the outer regions of ... more We present a study of the internal structure of 82 star clusters located at the outer regions of the Large Magellanic Cloud and the Small Magellanic Cloud using data of the VISCACHA Survey. Through the construction of the minimum spanning tree, which analyses the relative position of stars within a given cluster, it was possible to characterize the internal structure and explore the fractal or subclustered distribution for each cluster. We computed the parameters $\overline{m}$ (which is the average length of the connected segments normalized by the area), $\overline{s}$ (which is the mean points separation in units of cluster radius), and Q (the ratio of these components). These parameters are useful to distinguish between radial, homogeneous, and substructured distributions of stars. The dependence of these parameters with the different characteristics of the clusters, such as their ages and spatial distribution, was also studied. We found that most of the studied clusters present...
ABSTRACT The data come from CCD photometric observations carried out at two different telescopes:... more ABSTRACT The data come from CCD photometric observations carried out at two different telescopes: - The Cerro Tololo Inter-American Observatory (CTIO): UBV(RI)c CCD photometric data of the field of NGC 2425 and 2635 were acquired with the 0.9m telescope on the nights of January 4, 6 and 7, 1998. - The European Southern Observatory (ESO): CCD VI observations of the fields of NGC 2425 using the new EMMI read arm camera at the NTT on the photometric night of December 9, 2002. (2 data files).
Revista Mexicana De Astronomia Y Astrofisica, 2001
CCD UBVI photometry was carried out in the field of the open cluster Trumpler 21. Our data locate... more CCD UBVI photometry was carried out in the field of the open cluster Trumpler 21. Our data locate the cluster at a distance of 1380 pc in a low absorption zone with E(B-V) = 0.25. The age of the cluster is estimated to be 25-30 × 106 yr based on the superposition of isochrones computed with mass loss and overshooting.
The VISTA Variables in the Vía Láctea (VVV) survey is one of six public ESO surveys, and is now i... more The VISTA Variables in the Vía Láctea (VVV) survey is one of six public ESO surveys, and is now in its 4th year of observing. Although far from being complete, the VVV survey has already delivered many results, some directly connected to the intended science goals (detection of variables stars, microlensing events, new star clusters), others concerning more exotic objects, e.g. novae. Now, at the end of the fourth observing period, and comprising roughly 50% of the proposed observations, the actual status of the survey, as well some of the results based on the VVV data, are presented.
We present here the main research lines related to the survey Vista Variables in the Vía Láctea (... more We present here the main research lines related to the survey Vista Variables in the Vía Láctea (VVV) being carried out at "Node La Plata". These lines involve the study of stellar clusters and eclipsing systems. In this frame- work raises the following studies: a) An preliminar analysis of a group of embedded stellar clusters located in the fourth Galactic
In this work we present the detection of 33 star clusters and 51 candidates in one field of the n... more In this work we present the detection of 33 star clusters and 51 candidates in one field of the near by galaxy M 33. This study is based on WFC/ACS images available from the HST archive. Thanks to the high resolving power, we were able to confirm that two candidates previously indicated by Christian & Schommer (1982ApJS...49..405C) are indeed star clusters. We list the main properties for the star clusters (and candidates), along with some peculiar objects, such as background galaxies and possible HII regions. (3 data files).
We present a study of the internal structure of 82 star clusters located at the outer regions of ... more We present a study of the internal structure of 82 star clusters located at the outer regions of the Large Magellanic Cloud and the Small Magellanic Cloud using data of the VISCACHA Survey. Through the construction of the minimum spanning tree, which analyses the relative position of stars within a given cluster, it was possible to characterize the internal structure and explore the fractal or subclustered distribution for each cluster. We computed the parameters $\overline{m}$ (which is the average length of the connected segments normalized by the area), $\overline{s}$ (which is the mean points separation in units of cluster radius), and Q (the ratio of these components). These parameters are useful to distinguish between radial, homogeneous, and substructured distributions of stars. The dependence of these parameters with the different characteristics of the clusters, such as their ages and spatial distribution, was also studied. We found that most of the studied clusters present...
ABSTRACT The data come from CCD photometric observations carried out at two different telescopes:... more ABSTRACT The data come from CCD photometric observations carried out at two different telescopes: - The Cerro Tololo Inter-American Observatory (CTIO): UBV(RI)c CCD photometric data of the field of NGC 2425 and 2635 were acquired with the 0.9m telescope on the nights of January 4, 6 and 7, 1998. - The European Southern Observatory (ESO): CCD VI observations of the fields of NGC 2425 using the new EMMI read arm camera at the NTT on the photometric night of December 9, 2002. (2 data files).
Revista Mexicana De Astronomia Y Astrofisica, 2001
CCD UBVI photometry was carried out in the field of the open cluster Trumpler 21. Our data locate... more CCD UBVI photometry was carried out in the field of the open cluster Trumpler 21. Our data locate the cluster at a distance of 1380 pc in a low absorption zone with E(B-V) = 0.25. The age of the cluster is estimated to be 25-30 × 106 yr based on the superposition of isochrones computed with mass loss and overshooting.
The VISTA Variables in the Vía Láctea (VVV) survey is one of six public ESO surveys, and is now i... more The VISTA Variables in the Vía Láctea (VVV) survey is one of six public ESO surveys, and is now in its 4th year of observing. Although far from being complete, the VVV survey has already delivered many results, some directly connected to the intended science goals (detection of variables stars, microlensing events, new star clusters), others concerning more exotic objects, e.g. novae. Now, at the end of the fourth observing period, and comprising roughly 50% of the proposed observations, the actual status of the survey, as well some of the results based on the VVV data, are presented.
We present here the main research lines related to the survey Vista Variables in the Vía Láctea (... more We present here the main research lines related to the survey Vista Variables in the Vía Láctea (VVV) being carried out at "Node La Plata". These lines involve the study of stellar clusters and eclipsing systems. In this frame- work raises the following studies: a) An preliminar analysis of a group of embedded stellar clusters located in the fourth Galactic
In this work we present the detection of 33 star clusters and 51 candidates in one field of the n... more In this work we present the detection of 33 star clusters and 51 candidates in one field of the near by galaxy M 33. This study is based on WFC/ACS images available from the HST archive. Thanks to the high resolving power, we were able to confirm that two candidates previously indicated by Christian & Schommer (1982ApJS...49..405C) are indeed star clusters. We list the main properties for the star clusters (and candidates), along with some peculiar objects, such as background galaxies and possible HII regions. (3 data files).
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Papers by Gustavo Luis Baume