Morphologies and ages of star cluster pairs and multiplets in the Small Magellanic Cloud

An isophotal atlas of 75 star cluster pairs and multiplets in the Small Magellanic Cloud is presented, comprising 176 objects. They are concentrated in the SMC main body. The isophotal contours were made from Digitized Sky Survey images and showed relevant structural features possibly related to interactions in about 25% of the sample. Previous N-body simulations indicate that such shapes could be due to tidal tails, bridges or common envelopes. The diameter ratio between the members of a pair is preferentially in the range 1 - 2, with a peak at 1. The projected separation is in the range ~ 3 - 22 pc with a pronounced peak at ~ 13 pc. For 91 objects it was possible to derive ages from Colour-Magnitude Diagrams using the OGLE-II photometric survey. The cluster multiplets in general occur in OB stellar associations and/or HII region complexes. This indicates a common origin and suggests that multiplets coalesce into pairs or single clusters in a short time scale. Pairs in the SMC appear to be mostly coeval and consequently captures are a rare phenomenon. We find evidence that star cluster pairs and multiplets may have had an important role in the dynamical history of clusters presently seen as large single objects

Dissolving star cluster candidates

We present a list of 34 neglected entries from star cluster catalogues located at relatively high galactic latitudes ($|b| >$ 15$^{\circ}$) which appear to be candidate late stages of star cluster dynamical evolution. Although underpopulated with respect to usual open clusters, they still present a high number density contrast as compared to the galactic field. This was verified by means of (i) predicted model counts from different galactic subsystems in the same direction, and (ii) Guide Star Catalog equal solid angle counts for the object and surrounding fields. This suggests that the objects are physical systems, possibly star clusters in the process of disruption or their fossil remains. The sample will be useful for followup studies in view of verifying their physi cal nature.Comment: manuscript in LATEX with 7 pages, 7 figures .ps Accepted for Astronomy and Astrophysics main journa

A Catalogue of infrared star clusters and stellar groups

We compiled a catalogue of infrared star clusters in the Galaxy, which are most of them embedded. It condenses the growing literature information. We also include in the sample infrared stellar groups which are less dense than star clusters, such as those embedded in the dark clouds Taurus-Auriga and Chamaleon I. We provide galactic and equatorial coordinates, angular dimensions, different designations and related objects such as nebulae. A total of 189 infrared clusters and 87 embedded stellar groups are included. A fraction of 25 % of the embedded clusters are projected close to each other in pair or triplet systems, indicating that multiplicity plays an important role in star cluster formation.Comment: 5 pages, 3 figures, accepted for publication in Astronomy & Astrophysics on October 10, 200

Reflexos da obra de Nina Rodrigues no pensamento social brasileiro

According to the readings from the works of Raimundo Nina Rodrigues, the proposed article aims to establish a connection between them and the Brazilian social thought, concomitantly brings an analysis of general practice and uses of theses ethnic-racial provided to the author by contemporaneity.De acordo com as leituras a partir das obras de Raimundo Nina Rodrigues, o artigo proposto visa estabelecer uma conexão entre elas e o pensamento social brasileiro, concomitantemente traz uma análise em linhas gerais das práxis e usos das teses étnico-raciais desde o referido autor até a contemporaneidade

Rapid determination of the aromatic compounds methyl-anthranilate, 2′-aminoacetophenone and furaneol by GC-MS: Method validation and characterization of grape derivatives.

A methodology for the rapid determination of the aromatic compounds methyl anthranilate (MA), 2&#8242;-aminoacetophenone (2-AAP) and furaneol by GC-MS was validated and used to characterize grape juice and wine elaborated with the new Brazilian grape varieties cultivated in northeastern Brazil, and Brazilian grape nectars. The method presented linearity (R2&#707;0.9952), good accuracy (CV< 12.9%), recovery (76.6% to 106.3%), limit of detection (23&#956;gL&#8722;1 to 94&#956;gL&#8722;1) and limit of quantification (96&#956;gL&#8722;1 to 277&#956;gL&#8722;1) acceptable in only 20 min of running. The methodology was considered satisfactory for the purpose, being a simple and rapid method for the determination of these compounds in grape derivatives drinks. In the characterization of the nectars the compound that stood out was the MA, being its presence attributed to the addition of flavorings in these products. It was evidenced a significant contribution of furaneol in the aroma of grape juice and wines elaborated with the new Brazilian grape varieties

Rapid determination of the aromatic compounds methyl-anthranilate, 2&#8242;-aminoacetophenone and furaneol by GC-MS: Method validation and characterization of grape derivatives.

A methodology for the rapid determination of the aromatic compounds methyl anthranilate (MA), 2&#8242;-aminoacetophenone (2-AAP) and furaneol by GC-MS was validated and used to characterize grape juice and wine elaborated with the new Brazilian grape varieties cultivated in northeastern Brazil, and Brazilian grape nectars. The method presented linearity (R2&#707;0.9952), good accuracy (CV< 12.9%), recovery (76.6% to 106.3%), limit of detection (23&#956;gL&#8722;1 to 94&#956;gL&#8722;1) and limit of quantification (96&#956;gL&#8722;1 to 277&#956;gL&#8722;1) acceptable in only 20 min of running. The methodology was considered satisfactory for the purpose, being a simple and rapid method for the determination of these compounds in grape derivatives drinks. In the characterization of the nectars the compound that stood out was the MA, being its presence attributed to the addition of flavorings in these products. It was evidenced a significant contribution of furaneol in the aroma of grape juice and wines elaborated with the new Brazilian grape varieties