1,723,588 research outputs found
Optical polarization study in the Centaurus Region: NGC 5662
Full text linkWe present (BV RI) multicolor linear polarimetric data of 73 of the brightest stars in the open cluster NGC 5662. Our objective is to study the characteristics of the interstellar medium (ISM) towards it and in its the environment. NGC 5662 is polarimetrically characterized by PV = 2.27%±0.13 and θV =89º.6 ± 1.17. Its polarization efficiency is much higher than the normal efficiency of ISM. The observed visual polarization in NGC 5662 is caused at least by three components of dust at ≈ 200 pc, 500 pc and 900 pc from the Sun. These have different polarimetric characteristics and the layer located at 500 pc has a variable density. The absorption presents a different behavior to polarization as the distance increases. A few of the observed stars present evidences of intrinsic polarization.Presentamos observaciones polarimétricas lineales en las bandas BV RI de 73 de las estrellas más brillantes en el cúmulo abierto NGC 5662. Nuestro objetivo es estudiar las características del medio interestelar (ISM) en dirección y en los alrededores del cúmulo. NGC 5662 está polarimétricamente caracterizado por PV = 2.27%± 0.13 and θV =89º.6 ± 1.17. Su eficiencia polarimétrica es mucho más alta que la eficiencia normal del medio interestelar. La polarización visual observada en NGC 5662 es causada al menos por tres componentes de polvo a ≈ 200 pc, 500 pc and 900 pc desde el Sol. Estas tienen diferentes características polarimétricas y la componente localizada a 500 pc tiene densidad variable. La absorción presenta un comportamiento diferente a la polarización en función de la distancia. Unas pocas de las estrellas observadas presentan evidencias de polarización intrínseca.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plat
Optical polarization study in the Centaurus Region: NGC 5662
Full text linkWe present (BV RI) multicolor linear polarimetric data of 73 of the brightest stars in the open cluster NGC 5662. Our objective is to study the characteristics of the interstellar medium (ISM) towards it and in its the environment. NGC 5662 is polarimetrically characterized by PV = 2.27%±0.13 and θV =89º.6 ± 1.17. Its polarization efficiency is much higher than the normal efficiency of ISM. The observed visual polarization in NGC 5662 is caused at least by three components of dust at ≈ 200 pc, 500 pc and 900 pc from the Sun. These have different polarimetric characteristics and the layer located at 500 pc has a variable density. The absorption presents a different behavior to polarization as the distance increases. A few of the observed stars present evidences of intrinsic polarization.Presentamos observaciones polarimétricas lineales en las bandas BV RI de 73 de las estrellas más brillantes en el cúmulo abierto NGC 5662. Nuestro objetivo es estudiar las características del medio interestelar (ISM) en dirección y en los alrededores del cúmulo. NGC 5662 está polarimétricamente caracterizado por PV = 2.27%± 0.13 and θV =89º.6 ± 1.17. Su eficiencia polarimétrica es mucho más alta que la eficiencia normal del medio interestelar. La polarización visual observada en NGC 5662 es causada al menos por tres componentes de polvo a ≈ 200 pc, 500 pc and 900 pc desde el Sol. Estas tienen diferentes características polarimétricas y la componente localizada a 500 pc tiene densidad variable. La absorción presenta un comportamiento diferente a la polarización en función de la distancia. Unas pocas de las estrellas observadas presentan evidencias de polarización intrínseca.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plat
Estudio polarimétrico en la región de Centauro: NGC 5662
Full text linkEn el presente trabajo se muestran los resultados preliminares de las observaciones polarimétricas obtenidas en las bandas BVRI sobre una muestra de 70 estrellas en la dirección al cúmulo abierto NGC 5662 en la región de Centauro.This paper shows the preliminary results of the polarimetric observations obtained in the BVRI bands on a sample of 70 stars towards the region of the open cluster NGC 5662 in Centaurus.Trabajo publicado en Actas de las Terceras Jornadas de Astrofísica Estelar. La Plata, Asociación Argentina de Astronomía, 2018.Facultad de Ciencias Astronómicas y Geofísica
Optical Polarization Study on the region Centaurus: NGC 5662
No full textPresentamos observaciones polarimétricas lineales en las bandas BV RI de 73 de las estrellas más brillantes en el cúmulo abierto NGC 5662. Nuestro objetivo es estudiar las características del medio interestelar (ISM) en dirección y en los alrededores del cúmulo. NGC 5662 está polarimétricamente caracterizado por PV = 2.27% ± 0.13 and θV =89º.6 ± 1.17. Su eficiencia polarimétrica es mucho más alta que la eficiencia normal del medio interestelar. La polarización visual observada en NGC 5662 es causada al menos por tres componentes de polvo a ≈ 200 pc, 500 pc and 900 pc desde el Sol. Estas tienen diferentes características polarimétricas y la componente localizada a 500 pc tiene densidad variable. La absorción presenta un comportamiento diferente a la polarización en función de la distancia. Unas pocas de las estrellas observadas presentan evidencias de polarización intrínseca.We present (BV RI) multicolor linear polarimetric data of 73 of the brightest stars in the open cluster NGC 5662. Our objective is to study the characteristics of the interstellar medium (ISM) towards it and in its the environment. NGC 5662 is polarimetrically characterized by PV = 2.27% ± 0.13 and θV =89º.6 ± 1.17. Its polarization efficiency is much higher than the normal efficiency of ISM. The observed visual polarization in NGC 5662 is caused at least by three components of dust at ≈ 200 pc, 500 pc and 900 pc from the Sun. These have different polarimetric characteristics and the layer located at 500 pc has a variable density. The absorption presents a different behavior to polarization as the distance increases. A few of the observed stars present evidences of intrinsic polarization.Fil: Vergne, Maria Marcela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Cs.astronómicas y Geofísicas. Departamento de Fotometria; ArgentinaFil: Feinstein Baigorri, Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Cs.astronómicas y Geofísicas. Departamento de Fotometria; ArgentinaFil: Martinez, Ruben Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentin
Estudio polarimétrico en la región de Centauro: NGC 5662
Full text linkEn el presente trabajo se muestran los resultados preliminares de las observaciones polarimétricas obtenidas en las bandas BVRI sobre una muestra de 70 estrellas en la dirección al cúmulo abierto NGC 5662 en la región de Centauro.This paper shows the preliminary results of the polarimetric observations obtained in the BVRI bands on a sample of 70 stars towards the region of the open cluster NGC 5662 in Centaurus.Trabajo publicado en Actas de las Terceras Jornadas de Astrofísica Estelar. La Plata, Asociación Argentina de Astronomía, 2018.Facultad de Ciencias Astronómicas y Geofísica
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
The open cluster NGC 5662 and its neighboring cepheid V Centauri
Full text linkBased on new photometric and kinematical data the structure and stellar composition of the open cluster NGC 5662 is examined. The presence of differential reddening across the cluster field is detected and the cluster stability examined. The luminosity function, distance, age, and chemical composition of NGC 5662 are determined from photometric and spectroscopic data. The new astrophysical parameters derived support the conclusion that the Cepheid V Cen (P=5.5 days) is very likely a cluster member. The UBV, DDO, CMT1T2 observations and the detailed results obtained in this work have been recently published by Clariá et al. (1991).Asociación Argentina de Astronomí
Variations on the Author
Full text link“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
Full text linkWe 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
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