Esta dissertação apresenta uma leitura da obra Palomar, 1983, pautada nas relações de similitude e assimetria com Lezioni americane: sei proposte per il prossimo millennio, 1988. A análise pretende demonstrar as relações entre narrativa e estética literária no último Calvino, assim como os procedimentos narrativos escolhidos para transformar concepções literárias em narrativas e vice-versa. Para tal, foi realizada a leitura das duas obras buscando os valores elencados por ele durante as conferências americanas na estrutura narrativa de Palomar. Num primeiro momento, será feita uma leitura panorâmica das duas obras. Em seguida, a partir dos conceitos calvinianos de exatidão, multiplicidade e visibilidade, serão analisadas as três áreas temáticas sobre as quais se estrutura Palomar. / This study presents a reading of the literary work entitled \"Palomar\", 1983, ruled by similitude and asymmetry relations with Lezioni americane: sei proposte per il prossimo millenio, 1988. The analysis intends to demonstrate the liaisons between narrative and literary aesthetic in the last Calvino, as well as the narrative proceedings which were chosen to turn literary conceptions into narratives and vice-versa. For this purpose, a reading of these two works will be done, aiming the search for values which were listed by him in American speeches in Palomar\'s narrative structure. At first glance, a panoramic reading of both works will be done. Thereafter, it will be analyzed three thematic areas in which Palomar is structured based on calvinian concepts of exactitude, multiplicity and visibility.

Esta dissertação apresenta uma leitura da obra Palomar, 1983, pautada nas relações de similitude e assimetria com Lezioni americane: sei proposte per il prossimo millennio, 1988. A análise pretende demonstrar as relações entre narrativa e estética literária no último Calvino, assim como os procedimentos narrativos escolhidos para transformar concepções literárias em narrativas e vice-versa. Para tal, foi realizada a leitura das duas obras buscando os valores elencados por ele durante as conferências americanas na estrutura narrativa de Palomar. Num primeiro momento, será feita uma leitura panorâmica das duas obras. Em seguida, a partir dos conceitos calvinianos de exatidão, multiplicidade e visibilidade, serão analisadas as três áreas temáticas sobre as quais se estrutura Palomar. / This study presents a reading of the literary work entitled \"Palomar\", 1983, ruled by similitude and asymmetry relations with Lezioni americane: sei proposte per il prossimo millenio, 1988. The analysis intends to demonstrate the liaisons between narrative and literary aesthetic in the last Calvino, as well as the narrative proceedings which were chosen to turn literary conceptions into narratives and vice-versa. For this purpose, a reading of these two works will be done, aiming the search for values which were listed by him in American speeches in Palomar\'s narrative structure. At first glance, a panoramic reading of both works will be done. Thereafter, it will be analyzed three thematic areas in which Palomar is structured based on calvinian concepts of exactitude, multiplicity and visibility.

Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 259-266). Available also in a digital version from Dissertation Abstracts.

Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 259-266). Available also in a digital version from Dissertation Abstracts.

No description available.

A supernova (SN) is the explosive destruction of a star. Via a luminous outpouring of radiation, the SN can rival the brightness of its SN host galaxy for months or years. In the past decade, astronomical surveys regularly observing the sky to deep limiting magnitudes have revealed that core collapse SNe (the demises of massive stars) are sometimes preceded by eruptive episodes by the progenitor stars during the years before the eventual SN explosion. Such SNe tend to show strong signatures of interaction between the SN ejecta and the circumstellar medium (CSM) deposited by the star before the SN explosion, likely by mass-loss episodes like the ones we have started to observe regularly. The complex CSM resolved around certain giant stars in our own galaxy and the eruptions of giant stars like η Car in the 19th century can be seen in this context. As the SN ejecta of an interacting SN sweep up the CSM of the progenitor, radiation from this process offers observers opportunity to scan the late mass loss history of the progenitor. In this thesis, interacting SNe and eruptive mass loss of their progenitors is discussed. The SN iPTF13z (discovered by the intermediate Palomar Transient Factory, iPTF) is presented. This transient was followed with optical photometry and spectroscopy during 1000 days and displayed a light curve with several conspicuous re-brigthenings ("bumps"), likely arising from SN ejecta interacting with denser regions in the CSM. Around 200 days before discovery, in archival data we found a clear precursor outburst lasting >~ 50 days. A well-observed (but not necessarily well understood) event like SN 2009ip, which showed both precursor outbursts and a light curve bump, makes an interesting comparison object. The embedding of the (possible) SN in a CSM makes it hard to tell if a destructive SN explosion actually happened. In this respect, iPTF13z is compared to e.g. SN 2009ip but also to long-lived interacting SNe like SN 1988Z. Some suggestions for future investigations are offered, to tie light curve bumps to precursor events and to clarify the question of core collapse in the ambiguous cases of some interacting SNe.

Optical interferometry is a technique by which the diameters and indeed the direct pulsations of stars are routinely being measured. As a follow-on to a 7 year interferometric campaign to measure the pulsations of over 100 mira variables, our team has been using the Spitzer Space Telescope to obtain 95 mid-infrared spectra of 25 miras during their pulsations over one year while simultaneously ascertaining their near-infrared diameters using the Palomar Testbed Interferometer. These data will then be combined with modeling from NLTE and radiative transfer codes to place hard constraints on our understanding of these stars and their circumstellar environments. We present some initial results from this work and discuss the next steps toward fully characterizing the atmosphere, molecular photosphere and dust production in mira variables.

Ce mémoire de maîtrise se divise en deux parties. Dimitri, qui prend la forme d’un recueil de onze courts textes, est une création hybride empruntant à la fois au roman et au recueil de nouvelles sans adhérer complètement à l’une ou l’autre de ces formules, et se construit autour du personnage singulier de Dimitri. Évoluant dans un monde qui lui est étranger, Dimitri tente d’exister par le biais de la parole, mais chacune de ses tentatives est vouée à l’échec. De la dissolution du personnage à la typologie de l’étranger aux autres et à soi-même dans Plume, d’Henri Michaux, Palomar, d’Italo Calvino et La Nébuleuse du crabe, d’Éric Chevillard s’intéresse au phénomène d’amenuisement du personnage. Cette analyse propose de voir quel sens peut revêtir la mise en scène des personnages de Plume, de Palomar et de Crab, et de quelle vision du monde participent les œuvres qui les accueillent. / This master thesis is divided into two parts. Dimitri, a collection of eleven short texts, is a hybrid creation within both the novel and the short story collection without completely conforming to either of them and is built around the singular character of Dimitri. Coping in a world that is foreign to himself, Dimitri tries to exist through speech, but each attempt is doomed to failure. From the dissolution of the character to being quite oblivious to his own existence and to his surroundings in Plume, by Henri Michaux, Mr. Palomar, by Italo Calvino and The Crab Nebula, by Eric Chevillard takes into account the phenomenon of depletion of the character. This analysis intends to explain how to consider and make sense of the characters of Plume, Palomar and Crab, and what vision of the world participate the works that receive them.

Detailed chemical abundances of globular clusters in the Milky Way and M31 (the Andromeda Galaxy) are presented based on analyses of high resolution spectra. The unusual Milky Way cluster Palomar 1 (Pal 1) is studied through spectra of individual red giant branch stars; these abundances show that Pal 1 is not a classical globular cluster, and may have been accreted from a dwarf satellite of the Milky Way. The Milky Way globular clusters 47 Tuc, M3, M13, NGC 7006, and M15 are studied through their integrated light (i.e. a single spectrum is obtained for each cluster) in order to test high resolution integrated light analyses. The integrated abundances from these clusters reproduce the average abundances from individual stellar analyses for elements that do not vary within a cluster (e.g. Fe, Ca, and Ni). For elements that do vary within the clusters (e.g. Na and Mg) the integrated abundances fall within the observed ranges from individual stars. Certain abundance ratios are found to be extremely sensitive to uncertainties in the underlying stellar populations, such as input models, empirical relations to determine atmospheric parameters, interloping field stars, etc., while others (such as [Ca I/Fe I]) are largely insensitive to these effects. With these constraints on the accuracy and precision of high resolution integrated light analyses, detailed abundances are obtained for seven clusters in the outer halo of M31 that were recently discovered in the Pan-Andromeda Archaeological Survey (PAndAS) and are likely to have originated in dwarf galaxy satellites. Three clusters are relatively metal rich ([Fe/H] > −1.5) for their locations in the outer halo; their chemical abundances suggest that they likely originated in one or more fairly massive dwarf satellities. The other four are more metal-poor, and may have originated in less massive dwarf satellites. These results indicate that the Milky Way and M31 have both experienced some amount of accretion from dwarf satellites, though M31 may have had a more active accretion history. / Graduate

Masters of Science / Observations that push the boundaries have historically fuelled scientific breakthroughs, and these observations frequently involve phenomena that were previously unseen and unidentified. Data sets have increased in size and quality as modern technology advances at a record pace. Finding these elusive phenomena within these large data sets becomes a tougher challenge with each advancement made. Fortunately, machine learning techniques have proven to be extremely valuable in detecting outliers within data sets. Astronomaly is a framework that utilises machine learning techniques for anomaly detection in astronomy and incorporates active learning to provide target specific results. It is used here to evaluate whether machine learning techniques are suitable to detect anomalies within the optical astronomical data obtained from the Dark Energy Camera Legacy Survey. Using the machine learning algorithm isolation forest, Astronomaly is applied on subsets of the Dark Energy Camera Legacy Survey (DECaLS) data set. The pre-processing stage of Astronomaly had to be significantly extended to handle real survey data from DECaLS, with the changes made resulting in up to 10% more sources having their features extracted successfully. For the top 500 sources returned, 292 were ordinary sources, 86 artefacts and masked sources and 122 were interesting anomalous sources. A supplementary machine learning algorithm known as active learning enhances the identification probability of outliers in data sets by making it easier to identify target specific sources. The addition of active learning further increases the amount of interesting sources returned by almost 40%, with 273 ordinary sources, 56 artefacts and 171 interesting anomalous sources returned. Among the anomalies discovered are some merger events that have been successfully identified in known catalogues and several candidate merger events that have not yet been identified in the literature. The results indicate that machine learning, in combination with active learning, can be effective in detecting anomalies in actual data sets. The extensions integrated into Astronomaly pave the way for its application on future surveys like the Vera C. Rubin Observatory Legacy Survey of Space and Time.