DOCSLIB.ORG

THE TENTH EUROPEAN REGIONAL ASTRONOMY MEETING of the SAU Prague Czechoslovakia 24

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
THE TENTH EUROPEAN REGIONAL ASTRONOMY MEETING of the SAU Prague Czechoslovakia 24 £.J? f.fj£>g$r!, INIS-mf--H267 THE TENTH EUROPEAN REGIONAL ASTRONOMY MEETING OF THE SAU Prague Czechoslovakia 24- 29 August 1987 THE TENTH EUROPEAN REGIONAL ASTRONOMY MEETING OF THE IAU 24- 29 August 1987 FOREWORD This brochure includes abstracts of papers presented at the Tenth Euro- pean Regional Astronomy Meeting. The sequence of abstracts is alphabetical of the name of the first author within each Session or Workshop. The booklet is printed in offset, hence its quality depends on the quality of the typescripts submitted by the authors. Abstract received later than 20 May 1987 are not included in this brochure. They will be available under the title LATE ABSTRACT in the Registration Office. CONTENTS Page PS 1-3 Plenary Sessions 1 TS 1 Development of Solar Active Regions 3 TS 2 The Complex of Interplanetary Bodies 22 TS 3 Resonances in the Solar System 39 SW 1 Structure of Galaxies and Star Formation 47 SW 2 Rapid Variability of Single, Binary and Multiple Stars 74 CP 1 Ultraviolet Stellar Spectra 82 CP 2 Cosmology and Formation of Galaxies 85 CP 3 Modern Astrometry 88 CP Halley's Comet (Merged with TS 2) CP 5 High-Energy Astrophysics 90 CP 6 Active Extragalactic Objects 91 CP 7 Binary Stars 9* CP 8 The Sun (Merged with TS 1) Register of Author's Names 101 PS 1-3 PLENARY SESSIONS MAGNETIC FIELDS OF THE SUN AND STARS V. Bumba Astronomical Institute of the Czechoslovak Academy of Sciences 251 65 Ondfejov, Czechoslovakia We summarize the main results obtained by the joint effort of solar and stellar physicists through the investigation of solar and solar type activities on the low- -mass main sequence stars. We demonstrate the basic role of magnetic field in this activity and the importance of its interaction with the convection and differential rotation of each star. We compile data obtained by ground-based optical, radio and space observations of these stars giving us ideas about the physical conditions in the stellar photo- spheres, chromospheres and coronae, their activity periodicities and relations of this activity to other stellar parameters. We discuss the possible depth of the dynamo action in the Sun and stars in its relation to the convective zone. We present some results of the method of direct stellar magnetic field measurements in compari- son with various indirect evidences about the action of stellar magnetic fields. We show also some observed differences both between the sun- and star-spots, and plages, and we bring information concerning the stellar flares. Finally, to compare the main behaviour of magnetic fields on the Sun and stars and the characteristics of the solar and stellar activities, we bring some of our new observational results concerning the mutual relation of magnetic and other ac- tivities with differential rotation on the Sun. We also try to indicate the location and manifestation of solar dynamo action and the influence of convective motions on the development of solar activity from the distribution of solar magnetic fields. Hipparcos - High Precision Astroaetric Data From Space M.A.C. Ferryman Astrophysics Division, European Space Agency ESTEC, Noordvijk, The Netherlands The goal of the Hipparcos mission is an ambitious one - the creation of an astroaetric catalogue of some 120 000 stars, vith an unprecedented precision on each of the five astronetrie parameters of each star: the tvo positional components, the tvo proper Motion components and, the key to estimating distances within our Galaxy, the parallax. Vith the availability of these data, the astronomical community will be provided vith fresh and dramatic insights into many aspects of this fundamental branch of science. Astrometrists vill have at their disposal a vast quantity of accurate and homogeneous data which can be used to improve upon the present knowledge of the optical reference frame, and which vill provide a dense reference system for past and future ground-based observations. Astrophysicists vill be provided vith parallaxes and proper motions of not only a highly accurate but also a remarkably homogeneous nature. Less-veil appreciated by-products of the astroaetric measurements vill be a systematic search for and measurements of binary and multiple star systems, and about 100 high-precision photometric measurenents for each star distributed over the 2.5-year mission lifetime. The satellite construction is on schedule for launch by Ariane in July 1988. The payload has been fully manufactured, and laboratory tests indicate that in all key areas the technical specifications have been achieved, and that the predicted accuracy of about 2 milli-arcsec for each of the astroaetric parameters vill be met. The scientific consortium INCA has completed, on schedule, the construction of the part of the Input Catalogue necessary for satellite operations. Containing the list of all objects to be observed, this catalogue represents the high-priority scientific targets for observation, contains detailed data for each star contained in the catalogue (cross-identifications, astroaetric and photometric data, etc), and vill be of great value in its own right as a research tool. The other institutes collaborating vith ESA in the project, and responsible for the preparation of the entire data treatment, have operational simulations for all parts of the data analysis, and expect to be ready to treat the satellite data as it arrives from the satellite. The presentation and the full text of the paper vill provide an overviev of the scientific motivations for the project, an outline of the principals of the satellite operation, the satellite and predicted accuracy status, and a summary of the steps constituting the data reduction. - 1 - REVIEW OF RESULTS ON HALtEY'S COMET Jurgen Rahe Since its recovery in 1982, Comet Halley was the focus of an unparalleled global scientific effort of exploration. Remote and in-situ measurements were conducted from the ground, from Earth orbit, from Venus orbit, from interplanetary space, and from within the comet itself. Many discoveries, such as the presence of an unexpectedly large nucleus or the abundance of organic material, have led to major changes in our ideas about the general nature of comets. In this report the results of the-various studies will be summarized. THE PHOBOS MISSION Boris Valnfcek Astronomical Institute of the Czechoslovak Academy of Sciences 251 65 Ondfejov The complex space experiment Phobos will consist of two space probes carrying more than twenty experiments each. The primary purpose of the mission, launched in June 1988, is the exploration of the Mars satellite Phobos and of the planet itself. Various methods are used, including landing on the satellite and activa- tion of its surface minerals by laser beam. During orbiting around Mars, the atmosphere of the planet will be studied. The secondary purpose is to study solar activity during the flight from Earth to Mars, gathering informations on solar wind, interplanetary shock waves, and gamma bursts. Solar X-ray activity will be monitored and solar corona observed in X-rays; stereoscopic studies of the Sun will be made. The coordinator of the experiment is the Space Research Institute of the Academy of Sciences of the USSR, the other participants are from Austria, Bulgaria, Czechoslovakia, Finland, German Democratic Republic, German Federal Republic, Hungary, Poland, Sweden, Switzerland and ESA. _ o _ TS 1 DEVELOPMENT OF SOLAR ACTIVE REGIONS Microwave Emission Associated with a Moving Sunspot 12 3 C. E. Alissandrakis, F. Chiuderi-Drago and M. J. Hagyard 1. Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, GR 157 83, Athens, Greece. 2. Observatoire de Paris, Meudon, France and University of Florence, Italy. 3. NASA/MSFC, Ala. 35812, U.S.A. High resolution microwave observations provide important diagnostics for the physical conditions and the magnetic field in the chromosphere-corona transition region and the low corona (Alissandrakis et dl, 1980). He have used force-free extrapolations of photospheric magnetic field observat? s from Marshall Space Flight Center to compute the total intensity and circular polarization of suns t asso- ciated emission from active region 2502 in the period June 13 to June 15, 1980. The computed emission was compared to high resolution observations of the same active region at 6.16 cm obtained with the Westerbork Synthesis Radio Telescope (Shibasaki et al, 1983). The most interesting aspect of this active region was the developement of a new spot between the preceeding and the following spots on June 14, which subsequently merged with the preceeding spot. The new spot was associated with enhanced emission, with peak brightness temperature in excess of 4X10 K. Our model computations are in satisfactory agreement with the observations of June 13. How- ever, they fail to reproduce the enhanced emission associated with the new spot on June 14, although they reproduce the observed structure of the circular polarization map. This indicates that the dis- crepancy is due to the physical conditions assumed, rather than due to the extrapolated magnetic field. We show that unrealistic values of the conductive flux are required to reproduce the observed total intensity. We suggest that the enhanced emission is of non-thermal nature, due to mildly relativistic particles accelerated in the process of sunspot motion. References Alissandrakis, C. E., Kundu, M. R. and Lantos, P. : 1980, Astron. Astrophys. 82, 30. Shibasaki, K., Chiuderi-Drago, F., Melozzi, M., Slottje, C. and Antonucci, E. : 1982, Solar Phys. 89, 307. THE EVEPSHEO FLOW IN THE SOLRR PHOTOSPHERE, CHROMOSPHERE RNO CHROHOSPHERE-CORONR TRRNSITION REGION. 1 2 3 3 3 C.E. Rlissandrakis , D. Dialetis , P. Mein , B. Schaieder , and G. Siaon . 1 Section of Flstrophysics, Rstronoay and Mechanics, Departeaent of Physics, University of Rthens, Panepistimiopolis, Rthens 15783, Greece. 2 Rstronomical Institute, National Observatory of Rthens, P.O.Box 20048, Rthens 11010, Greece.
Load more

Recommended publications
  • 1986 DA and 1986 EB: IRON OBJECTS in NEAR-Eakm ORBITS; J.C
    LPSC XVIII 349 1986 DA AND 1986 EB: IRON OBJECTS IN NEAR-EAKm ORBITS; J.C. Gra- die, Planetary Geosciences Division, Hawaii Institute of Geophysics, University of Hawaii, Bonolalu, HI 96822 and E.F. Tede sco, Jet Propulsion Laboratory, Pasadena, CA 91109. The estimated 1,500 asteroids, with diameters larger than a few hun- dred meters, which cross or closely approach the Earth' s orbit are divided into three orbital classes: the Aten asteroids with semi-maj or axes less than 1 AU and which cross the Earth's orbit near aphelia, the Apollo asteroids with semi-major axes greater than or equal to 1 AU and with per- ihelia greater than 1.17 AU, and the Amor asteroids with perihelia between 1.17 and 1.3 AU (1). These asteroids which have orbits stable against col- 8 lision with or ejection by a planet on the order of lo7 to 10 years must be derived from either extinct cometary naclei (2) or the asteroid belt (C f. 1). These near-Earth asteroids are important for several diverse reasons: they represent a group of obj ect s from which at least some of the meteor- ites arc derived, they may harbor extinct cometary nuclei thought to con- tain some of the most primitive and, perhaps, pristine material in the solar system, occasionally collide with the Earth, and are among the most accessible objects in the solar system. Study of the physical properties of the Earth-approaching asteroids is constrained by the generally long time between close approaches and poorly known orbits.
    [Show full text]
  • NASA Chat: Asteroid 1998 QE2 to Sail Past Earth Expert Dr. Bill Cooke May 30, 2013 ______
    NASA Chat: Asteroid 1998 QE2 to Sail Past Earth Expert Dr. Bill Cooke May 30, 2013 _____________________________________________________________________________________ Moderator_Brooke: Welcome everyone! We're just about to start the chat, so please go ahead and send in your questions. Thanks for being here -- now let's talk asteroids! RSEW: Hello Bill_Cooke: We're here! Do you have a question? Moderator_Brooke: All right, here we go...Bill, over to you. tyler_hussey : I was wondering if people in New Hampshire will be able to view this asteroid pass by, and if so, what is the length it will be visible, what direction, and how close to the horizon? Bill_Cooke; Hi Tyler. You need a telescope to see the QE2 asteroid, and of course, it needs to be dark. It's visible there in N.H. with a small telescope about 10:30 p.m. local time. It will be in the constellation Hydra and be about eleventh magnitude. tyler_hussey: I was wondering if people in New Hampshire will be able to view this asteroid pass by, and if so, what is the length it will be visible, what direction, and how close to the horizon? Bill_Cooke: Unless you are Asia or Europe, you will not be able to see the asteroid at close approach. However, you can see it tonight around 10:30 pm local time with a small telescope. It will be in the constellation of Hydra. Moderator_Brooke: You can also find more information about QE2 at this link: http://www.nasa.gov/mission_pages/asteroids/news/asteroid20130530.html guest100: where did this asteroid come from Bill_Cooke: The asteroid 1998 QE2 is an amor asteroid which means it approaches Earth from the outside.
    [Show full text]
  • Naming the Extrasolar Planets
    Naming the extrasolar planets W. Lyra Max Planck Institute for Astronomy, K¨onigstuhl 17, 69177, Heidelberg, Germany [email protected] Abstract and OGLE-TR-182 b, which does not help educators convey the message that these planets are quite similar to Jupiter. Extrasolar planets are not named and are referred to only In stark contrast, the sentence“planet Apollo is a gas giant by their assigned scientific designation. The reason given like Jupiter” is heavily - yet invisibly - coated with Coper- by the IAU to not name the planets is that it is consid- nicanism. ered impractical as planets are expected to be common. I One reason given by the IAU for not considering naming advance some reasons as to why this logic is flawed, and sug- the extrasolar planets is that it is a task deemed impractical. gest names for the 403 extrasolar planet candidates known One source is quoted as having said “if planets are found to as of Oct 2009. The names follow a scheme of association occur very frequently in the Universe, a system of individual with the constellation that the host star pertains to, and names for planets might well rapidly be found equally im- therefore are mostly drawn from Roman-Greek mythology. practicable as it is for stars, as planet discoveries progress.” Other mythologies may also be used given that a suitable 1. This leads to a second argument. It is indeed impractical association is established. to name all stars. But some stars are named nonetheless. In fact, all other classes of astronomical bodies are named.
    [Show full text]
  • Spatial Distribution of Galactic Globular Clusters: Distance Uncertainties and Dynamical Effects
    Juliana Crestani Ribeiro de Souza Spatial Distribution of Galactic Globular Clusters: Distance Uncertainties and Dynamical Effects Porto Alegre 2017 Juliana Crestani Ribeiro de Souza Spatial Distribution of Galactic Globular Clusters: Distance Uncertainties and Dynamical Effects Dissertação elaborada sob orientação do Prof. Dr. Eduardo Luis Damiani Bica, co- orientação do Prof. Dr. Charles José Bon- ato e apresentada ao Instituto de Física da Universidade Federal do Rio Grande do Sul em preenchimento do requisito par- cial para obtenção do título de Mestre em Física. Porto Alegre 2017 Acknowledgements To my parents, who supported me and made this possible, in a time and place where being in a university was just a distant dream. To my dearest friends Elisabeth, Robert, Augusto, and Natália - who so many times helped me go from "I give up" to "I’ll try once more". To my cats Kira, Fen, and Demi - who lazily join me in bed at the end of the day, and make everything worthwhile. "But, first of all, it will be necessary to explain what is our idea of a cluster of stars, and by what means we have obtained it. For an instance, I shall take the phenomenon which presents itself in many clusters: It is that of a number of lucid spots, of equal lustre, scattered over a circular space, in such a manner as to appear gradually more compressed towards the middle; and which compression, in the clusters to which I allude, is generally carried so far, as, by imperceptible degrees, to end in a luminous center, of a resolvable blaze of light." William Herschel, 1789 Abstract We provide a sample of 170 Galactic Globular Clusters (GCs) and analyse its spatial distribution properties.
    [Show full text]
  • Magnetism, Dynamo Action and the Solar-Stellar Connection
    Living Rev. Sol. Phys. (2017) 14:4 DOI 10.1007/s41116-017-0007-8 REVIEW ARTICLE Magnetism, dynamo action and the solar-stellar connection Allan Sacha Brun1 · Matthew K. Browning2 Received: 23 August 2016 / Accepted: 28 July 2017 © The Author(s) 2017. This article is an open access publication Abstract The Sun and other stars are magnetic: magnetism pervades their interiors and affects their evolution in a variety of ways. In the Sun, both the fields themselves and their influence on other phenomena can be uncovered in exquisite detail, but these observations sample only a moment in a single star’s life. By turning to observa- tions of other stars, and to theory and simulation, we may infer other aspects of the magnetism—e.g., its dependence on stellar age, mass, or rotation rate—that would be invisible from close study of the Sun alone. Here, we review observations and theory of magnetism in the Sun and other stars, with a partial focus on the “Solar-stellar connec- tion”: i.e., ways in which studies of other stars have influenced our understanding of the Sun and vice versa. We briefly review techniques by which magnetic fields can be measured (or their presence otherwise inferred) in stars, and then highlight some key observational findings uncovered by such measurements, focusing (in many cases) on those that offer particularly direct constraints on theories of how the fields are built and maintained. We turn then to a discussion of how the fields arise in different objects: first, we summarize some essential elements of convection and dynamo theory, includ- ing a very brief discussion of mean-field theory and related concepts.
    [Show full text]
  • 1. Some of the Definitions of the Different Types of Objects in the Solar
    1. Some of the definitions of the different types of objects in has the greatest orbital inclination (orbit at the the solar system overlap. Which one of the greatest angle to that of Earth)? following pairs does not overlap? That is, if an A) Mercury object can be described by one of the labels, it B) Mars cannot be described by the other. C) Jupiter A) dwarf planet and asteroid D) Pluto B) dwarf planet and Kuiper belt object C) satellite and Kuiper belt object D) meteoroid and planet 10. Of the following objects in the solar system, which one has the greatest orbital eccentricity and therefore the most elliptical orbit? 2. Which one of the following is a small solar system body? A) Mercury A) Rhea, a moon of Saturn B) Mars B) Pluto C) Earth C) Ceres (an asteroid) D) Pluto D) Mathilde (an asteroid) 11. What is the largest moon of the dwarf planet Pluto 3. Which of the following objects was discovered in the called? twentieth century? A) Chiron A) Pluto B) Callisto B) Uranus C) Charon C) Neptune D) Triton D) Ceres 12. If you were standing on Pluto, how often would you see 4. Pluto was discovered in the satellite Charon rise above the horizon each A) 1930. day? B) 1846. A) once each 6-hour day as Pluto rotates on its axis C) 1609. B) twice each 6-hour day because Charon is in a retrograde D) 1781. orbit C) once every 2 days because Charon orbits in the same direction Pluto rotates but more slowly 5.
    [Show full text]
  • Winter Observing Notes
    Wynyard Planetarium & Observatory Winter Observing Notes Wynyard Planetarium & Observatory PUBLIC OBSERVING – Winter Tour of the Sky with the Naked Eye NGC 457 CASSIOPEIA eta Cas Look for Notice how the constellations 5 the ‘W’ swing around Polaris during shape the night Is Dubhe yellowish compared 2 Polaris to Merak? Dubhe 3 Merak URSA MINOR Kochab 1 Is Kochab orange Pherkad compared to Polaris? THE PLOUGH 4 Mizar Alcor Figure 1: Sketch of the northern sky in winter. North 1. On leaving the planetarium, turn around and look northwards over the roof of the building. To your right is a group of stars like the outline of a saucepan standing up on it’s handle. This is the Plough (also called the Big Dipper) and is part of the constellation Ursa Major, the Great Bear. The top two stars are called the Pointers. Check with binoculars. Not all stars are white. The colour shows that Dubhe is cooler than Merak in the same way that red-hot is cooler than white-hot. 2. Use the Pointers to guide you to the left, to the next bright star. This is Polaris, the Pole (or North) Star. Note that it is not the brightest star in the sky, a common misconception. Below and to the right are two prominent but fainter stars. These are Kochab and Pherkad, the Guardians of the Pole. Look carefully and you will notice that Kochab is slightly orange when compared to Polaris. Check with binoculars. © Rob Peeling, CaDAS, 2007 version 2.0 Wynyard Planetarium & Observatory PUBLIC OBSERVING – Winter Polaris, Kochab and Pherkad mark the constellation Ursa Minor, the Little Bear.
    [Show full text]
  • A Basic Requirement for Studying the Heavens Is Determining Where In
    Abasic requirement for studying the heavens is determining where in the sky things are. To specify sky positions, astronomers have developed several coordinate systems. Each uses a coordinate grid projected on to the celestial sphere, in analogy to the geographic coordinate system used on the surface of the Earth. The coordinate systems differ only in their choice of the fundamental plane, which divides the sky into two equal hemispheres along a great circle (the fundamental plane of the geographic system is the Earth's equator) . Each coordinate system is named for its choice of fundamental plane. The equatorial coordinate system is probably the most widely used celestial coordinate system. It is also the one most closely related to the geographic coordinate system, because they use the same fun­ damental plane and the same poles. The projection of the Earth's equator onto the celestial sphere is called the celestial equator. Similarly, projecting the geographic poles on to the celest ial sphere defines the north and south celestial poles. However, there is an important difference between the equatorial and geographic coordinate systems: the geographic system is fixed to the Earth; it rotates as the Earth does . The equatorial system is fixed to the stars, so it appears to rotate across the sky with the stars, but of course it's really the Earth rotating under the fixed sky. The latitudinal (latitude-like) angle of the equatorial system is called declination (Dec for short) . It measures the angle of an object above or below the celestial equator. The longitud inal angle is called the right ascension (RA for short).
    [Show full text]
  • ABSTRACT Reported Are the Hearings Held on April 29 and 30, 1969 Before the General Subcommittee on Education of the U.S
    DOCUMENT RESUME ED 060 893 LI 003 561 TITLE Hearings Before the General Subcommittee on Education...Ninety-First Congress, First Session on H.R. 8809...April 29 and 30, 1969- National Science Research Data Processing and Information Retrieval System. [Complete Text of the Hearings]. INSTITUTION Congress of the U.S., Washington, D.C. House Committee on Education and Labor. PUB DATE 69 NOTE 408p.;(1400 References) EDRS PRICE MF-$0.65 HC-$16.45 DESCRIPTORS Documentation; Federal Legislation; *Information Processing; *Information Retrieval; *information Systems; *National Programs; *Scientific Research IDENTIFIERS *Scientific and Technical Information ABSTRACT Reported are the hearings held on April 29 and 30, 1969 before the General Subcommittee on Education of the U.S. House of Representatives on H.R. 8809, a bill to amend Title IX of the National Defense Education Act of 1958 to provide for the establishment of a national information retrieval system for , scientific and technical information. The purpose of the act is to implement a nationwide storage and retrieval system for scientific research data, using as many existing facilities as possible in order to avoid duplication and to assure quick access to and a constant inventory of, all science research data. [Testimonies by Dr. John Rothman and Mr. Robert November appeared earlier as ED 051 8611. (SJ) NATIONAL SCIENCE RESEARCH DATAPROCESSING AND INFORMATIONRETRIEVAL SYSTEM HEARINGS BEFORE) TIM GENERAL SUBCOMMITTEEON EDUCATION or Tim COMMITTEE ONEDUCATION ANDLABOR HOUSE OFREPRESENTATIVES NINETY-FIRST CONGRESS FIRST SESSION ON H.R. 8809 A BILL TO AMEND TITLE DC OF THE NATIONALDEFENSE EDUCATION ACT OF 1958TO PROVIDE) FOR MENT OF A NATIONAL ESTABLISH- SCIENCE) RESEARCH DATAPROC- ESSING AND INFORMATIONRETRIEVAL SYSTEM HEARINGS HELD INWASHINGTON, D.C.
    [Show full text]
  • GU Monocerotis: a High-Mass Eclipsing Overcontact Binary in the Young Open Cluster Dolidze 25? J
    A&A 590, A45 (2016) Astronomy DOI: 10.1051/0004-6361/201628224 & c ESO 2016 Astrophysics GU Monocerotis: A high-mass eclipsing overcontact binary in the young open cluster Dolidze 25? J. Lorenzo1, I. Negueruela1, F. Vilardell2, S. Simón-Díaz3; 4, P. Pastor5, and M. Méndez Majuelos6 1 Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Escuela Politécnica Superior, Universidad de Alicante, Carretera de San Vicente del Raspeig s/n, 03690 San Vicente del Raspeig, Alicante, Spain e-mail: [email protected] 2 Institut d’Estudis Espacials de Catalunya, Edifici Nexus, c/ Capitá, 2−4, desp. 201, 08034 Barcelona, Spain 3 Instituto de Astrofísica de Canarias, Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain 4 Departamento de Astrofísica, Universidad de La Laguna, Facultad de Física y Matemáticas, Avda. Astrofísico Francisco Sánchez s/n, 38205 La Laguna, Tenerife, Spain 5 Departamento de Lenguajes y Sistemas Informáticos, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain 6 Departamento de Ciencias, IES Arroyo Hondo, c/ Maestro Manuel Casal 2, 11520 Rota, Cádiz, Spain Received 30 January 2016 / Accepted 3 March 2016 ABSTRACT Context. The eclipsing binary GU Mon is located in the star-forming cluster Dolidze 25, which has the lowest metallicity measured in a Milky Way young cluster. Aims. GU Mon has been identified as a short-period eclipsing binary with two early B-type components. We set out to derive its orbital and stellar parameters. Methods. We present a comprehensive analysis, including B and V light curves and 11 high-resolution spectra, to verify the orbital period and determine parameters.
    [Show full text]
  • 1 Reading Athenaios' Epigraphical Hymn to Apollo: Critical Edition And
    Reading Athenaios’ Epigraphical Hymn to Apollo: Critical Edition and Commentaries DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Corey M. Hackworth Graduate Program in Greek and Latin The Ohio State University 2015 Dissertation Committee: Fritz Graf, Advisor Benjamin Acosta-Hughes Carolina López-Ruiz 1 Copyright by Corey M. Hackworth 2015 2 Abstract This dissertation is a study of the Epigraphical Hymn to Apollo that was found at Delphi in 1893, and since attributed to Athenaios. It is believed to have been performed as part of the Athenian Pythaïdes festival in the year 128/7 BCE. After a brief introduction to the hymn, I provide a survey and history of the most important editions of the text. I offer a new critical edition equipped with a detailed apparatus. This is followed by an extended epigraphical commentary which aims to describe the history of, and arguments for and and against, readings of the text as well as proposed supplements and restorations. The guiding principle of this edition is a conservative one—to indicate where there is uncertainty, and to avoid relying on other, similar, texts as a resource for textual restoration. A commentary follows, which traces word usage and history, in an attempt to explore how an audience might have responded to the various choices of vocabulary employed throughout the text. Emphasis is placed on Athenaios’ predilection to utilize new words, as well as words that are non-traditional for Apolline narrative. The commentary considers what role prior word usage (texts) may have played as intertexts, or sources of poetic resonance in the ears of an audience.
    [Show full text]
  • View / Download 2.4 Mb
    Lucian and the Atticists: A Barbarian at the Gates by David William Frierson Stifler Department of Classical Studies Duke University Date:_______________________ Approved: ___________________________ William A. Johnson, Supervisor ___________________________ Janet Downie ___________________________ Joshua D. Sosin ___________________________ Jed W. Atkins Dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Classical Studies in the Graduate School of Duke University 2019 ABSTRACT Lucian and the Atticists: A Barbarian at the Gates by David William Frierson Stifler Department of Classical Studies Duke University Date:_______________________ Approved: ___________________________ William A. Johnson, Supervisor ___________________________ Janet Downie ___________________________ Joshua D. Sosin ___________________________ Jed W. Atkins An abstract of a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Classical Studies in the Graduate School of Duke University 2019 Copyright by David William Frierson Stifler 2019 Abstract This dissertation investigates ancient language ideologies constructed by Greek and Latin writers of the second and third centuries CE, a loosely-connected movement now generally referred to the Second Sophistic. It focuses on Lucian of Samosata, a Syrian “barbarian” writer of satire and parody in Greek, and especially on his works that engage with language-oriented topics of contemporary relevance to his era. The term “language ideologies”, as it is used in studies of sociolinguistics, refers to beliefs and practices about language as they function within the social context of a particular culture or set of cultures; prescriptive grammar, for example, is a broad and rather common example. The surge in Greek (and some Latin) literary output in the Second Sophistic led many writers, with Lucian an especially noteworthy example, to express a variety of ideologies regarding the form and use of language.
    [Show full text]