1,722,992 research outputs found
On the globular cluster NGC 5694
No full textWe present CCD photometry of the distant globular cluster NGC 5694. Colour-magnitude
diagrams and a colour-colour diagram using U, B & V data are shown. We find the reddening
in the direction of NGC 5694 to be E(B -V) = 0.10 ± 0.02. The metallicity is
determined from (U — B)₁ ₀ as [Fe/H]= —2.05 ± 0.20. We place an upper limit on the
distance of NGC 5694 from the sun of R < 33.4 Kpc. We do not detect conventional
Blue Straggler stars in NGC 5694. If these stars are present, they are in a magnitude
range which is at the limit of our photometry. In addition to the known blue horizontal
branch, we detect a sparsely populated red horizontal branch, which could be identified
as an evolved population of Blue Straggler Stars. We also detect a very bright and blue
population of stars in the core region of the cluster. The latter two populations can not
be positively confirmed due to large photometric errors resulting from crowding in the
cluster centre. A Michie-King model fit to the surface brightness profile yields a core radius
of r[sub c] = 3”/51 and a concentration parameter c = 1.85. We do not detect indications of a collapsed core in NGC 5694. We outline an improved method for finding the centres
of globular clusters, which is used to determine the centre of the cluster to a high degree
of accuracy.Science, Faculty ofEarth, Ocean and Atmospheric Sciences, Department ofGraduat
NGC 5694: another extra-galactic globular cluster
No full textWe discuss the chemical composition of six giant stars of the outer Halo globular cluster NGC 5694, through the analysis of UVES@FLAMES high-resolution spectra. The cluster has an average iron content [Fe/H]=-1.83±0.01, solar-scaled [alpha /Fe] ratios and a very low Ba abundance ([Ba/Fe]=-0.71±0.06). These anomalous abundance patterns are different from those observed in other Halo globular clusters but similar to those of the metal-poor stars in typical dwarf spheroidal galaxies. These findings suggest an extra-galactic origin for NGC 5694, likely from a dwarf spheroidal galaxy...
Map of the colony of New Zealand [cartographic material] /
No full textMap of New Zealand with relief shown by hachures and spot heights.; Rex Nan Kivell Collection Map NK 5694. Inset: Sketch map of New Zealand showing railways and telegraphs. Scale 1:4 000 000
Seder night Passover 1934 (5694) at house of Hugo Brill given by Wilhelm Buchheim in Germany.
No full textCaption: Sederabend im Hause des Herrn Hugo Brill, Herzebrock, Pessach 1934 (5694) gegeben bei Willhelm BuchheimDigital Imag
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
NGC 5694: another foster son of the Galactic halo
No full textWe present the results of the analysis of high-resolution spectra obtained with UVES-FLAMES at the Very Large Telescope for six red giant branch stars in the outer-halo metal-poor ([Fe/H] I = -1.98 and [Fe/H] II = -1.83) Galactic globular cluster NGC 5694, which has been suggested as a possible incomer by Lee et al. based on the anomalous chemical composition of a single cluster giant. We obtain accurate abundances for a large number of elements and we find that (a)the six target stars have the same chemical composition within the uncertainties, except for Na and Al; (b) the average cluster abundance of a elements (with the only exception of Si) is nearly solar, at odds with typical halo stars and globular clusters of similar metallicity; (c) Y, Ba, La and Eu abundances are also significantly lower than in Galactic field stars and star clusters of similar metallicity. Hence, we confirm the Lee et al. classification of NGC 5694 as a cluster of extragalactic origin. We provide the first insight on the Na-O and Mg-Al anticorrelations in this cluster: all the considered stars have very similar abundance ratios for these elements, except one that has significantly lower [Na/Fe] and [Al/Fe] ratios, suggesting that some degree of early self-enrichment has occurred also in this cluster
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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