Book of Abstracts Ii Contents
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Astronomie in Theorie Und Praxis 8. Auflage in Zwei Bänden Erik Wischnewski
Astronomie in Theorie und Praxis 8. Auflage in zwei Bänden Erik Wischnewski Inhaltsverzeichnis 1 Beobachtungen mit bloßem Auge 37 Motivation 37 Hilfsmittel 38 Drehbare Sternkarte Bücher und Atlanten Kataloge Planetariumssoftware Elektronischer Almanach Sternkarten 39 2 Atmosphäre der Erde 49 Aufbau 49 Atmosphärische Fenster 51 Warum der Himmel blau ist? 52 Extinktion 52 Extinktionsgleichung Photometrie Refraktion 55 Szintillationsrauschen 56 Angaben zur Beobachtung 57 Durchsicht Himmelshelligkeit Luftunruhe Beispiel einer Notiz Taupunkt 59 Solar-terrestrische Beziehungen 60 Klassifizierung der Flares Korrelation zur Fleckenrelativzahl Luftleuchten 62 Polarlichter 63 Nachtleuchtende Wolken 64 Haloerscheinungen 67 Formen Häufigkeit Beobachtung Photographie Grüner Strahl 69 Zodiakallicht 71 Dämmerung 72 Definition Purpurlicht Gegendämmerung Venusgürtel Erdschattenbogen 3 Optische Teleskope 75 Fernrohrtypen 76 Refraktoren Reflektoren Fokus Optische Fehler 82 Farbfehler Kugelgestaltsfehler Bildfeldwölbung Koma Astigmatismus Verzeichnung Bildverzerrungen Helligkeitsinhomogenität Objektive 86 Linsenobjektive Spiegelobjektive Vergütung Optische Qualitätsprüfung RC-Wert RGB-Chromasietest Okulare 97 Zusatzoptiken 100 Barlow-Linse Shapley-Linse Flattener Spezialokulare Spektroskopie Herschel-Prisma Fabry-Pérot-Interferometer Vergrößerung 103 Welche Vergrößerung ist die Beste? Blickfeld 105 Lichtstärke 106 Kontrast Dämmerungszahl Auflösungsvermögen 108 Strehl-Zahl Luftunruhe (Seeing) 112 Tubusseeing Kuppelseeing Gebäudeseeing Montierungen 113 Nachführfehler -
Variable Star Section Circular No
The British Astronomical Association Variable Star Section Circular No. 176 June 2018 Office: Burlington House, Piccadilly, London W1J 0DU Contents Joint BAA-AAVSO meeting 3 From the Director 4 V392 Per (Nova Per 2018) - Gary Poyner & Robin Leadbeater 7 High-Cadence measurements of the symbiotic star V648 Car using a CMOS camera - Steve Fleming, Terry Moon and David Hoxley 9 Analysis of two semi-regular variables in Draco – Shaun Albrighton 13 V720 Cas and its close companions – David Boyd 16 Introduction to AstroImageJ photometry software – Richard Lee 20 Project Melvyn, May 2018 update – Alex Pratt 25 Eclipsing Binary news – Des Loughney 27 Summer Eclipsing Binaries – Christopher Lloyd 29 68u Herculis – David Conner 36 The BAAVSS Eclipsing Binary Programme lists – Christopher Lloyd 39 Section Publications 42 Contributing to the VSSC 42 Section Officers 43 Cover image V392 Per (Nova Per 2018) May 6.129UT iTelescope T11 120s. Martin Mobberley 2 Back to contents Joint BAA/AAVSO Meeting on Variable Stars Warwick University Saturday 7th & Sunday 8th July 2018 Following the last very successful joint meeting between the BAAVSS and the AAVSO at Cambridge in 2008, we are holding another joint meeting at Warwick University in the UK on 7-8 July 2018. This two-day meeting will include talks by Prof Giovanna Tinetti (University College London) Chemical composition of planets in our Galaxy Prof Boris Gaensicke (University of Warwick) Gaia: Transforming Stellar Astronomy Prof Tom Marsh (University of Warwick) AR Scorpii: a remarkable highly variable -
Annual Report 2017
3 CONTACT DETAILS Dean Prof Danie Vermeulen +27 51 401 2322 [email protected] MARKETING MANAGER ISSUED BY Ms Elfrieda Lötter Faculty of Natural and Agricultural Sciences +27 51 401 2531 University of the Free State [email protected] EDITORIAL COMPILATION PHYSICAL ADDRESS Ms Elfrieda Lötter Room 9A, Biology Building, Main Campus, Bloemfontein LANGUAGE REVISION Dr Cindé Greyling and Elize Gouws POSTAL ADDRESS University of the Free State REVISION OF BIBLIOGRAPHICAL DATA PO Box 339 Dr Cindé Greyling Bloemfontein DESIGN, LAYOUT South Africa )LUHÀ\3XEOLFDWLRQV 3W\ /WG 9300 PRINTING Email: [email protected] SA Printgroup )DFXOW\ZHEVLWHZZZXIVDF]DQDWDJUL 4 NATURAL AND AGRICULTURAL SCIENCES REPORT 2017 CONTENT PREFACE Message from the Dean 7 AGRICULTURAL SCIENCES Agricultural Economics 12 Animal, Wildlife and Grassland Sciences 18 Plant Sciences 26 Soil, Crop and Climate Sciences 42 BUILDING SCIENCES Architecture 50 Quantity Surveying and Construction Management 56 8UEDQDQG5HJLRQDO3ODQQLQJ NATURAL SCIENCES Chemistry 66 Computer Sciences and Informatics 80 Consumer Sciences 88 Genetics 92 Geography 100 Geology 106 Mathematical Statistics and Actuarial Science 112 Mathematics and Applied Mathematics 116 Mathematics 120 0LFURELDO%LRFKHPLFDODQG)RRG%LRWHFKQRORJ\ Physics 136 Zoology and Entomology 154 5 Academic Centres Disaster Management Training and Education Centre of Africa - DiMTEC 164 Centre for Environmental Management - CEM 170 Centre for Microscopy 180 6XVWDLQDEOH$JULFXOWXUH5XUDO'HYHORSPHQWDQG([WHQVLRQ Paradys Experimental Farm 188 Engineering Sciences 192 Institute for Groundwater Studies 194 ACADEMIC SUPPORT UNITS Electronics Division 202 Instrumentation 206 STATISTICAL DATA Statistics 208 LIST OF ACRONYMS List of Acronyms 209 6 NATURAL AND AGRICULTURAL SCIENCES REPORT 2017 0(66$*( from the '($1 ANNUAL REPORT 2016 will be remembered as one of the worst ±ZKHUHHDFKELQFRXOGFRQWDLQDXQLTXHSURGXFWDQG years for tertiary education in South Africa due once a product is there, it remains. -
WALLABY – an SKA Pathfinder H I Survey
University of Louisville ThinkIR: The University of Louisville's Institutional Repository Faculty Scholarship 7-1-2020 WALLABY – an SKA Pathfinder H i survey Bärbel S. Koribalski Australia Telescope National Facility L. Staveley-Smith ARC Centre of Excellence for All-sky Astrophysics T. Westmeier ARC Centre of Excellence for All-sky Astrophysics P. Serra Osservatorio Astronomico di Cagliari K. Spekkens Royal Military College of Canada See next page for additional authors Follow this and additional works at: https://ir.library.louisville.edu/faculty Part of the Astrophysics and Astronomy Commons ThinkIR Citation Koribalski, Bärbel S.; Staveley-Smith, L.; Westmeier, T.; Serra, P.; Spekkens, K.; Wong, O. I.; Lee-Waddell, K.; Lagos, C. D.P.; Obreschkow, D.; Ryan-Weber, E. V.; Zwaan, M.; Kilborn, V.; Bekiaris, G.; Bekki, K.; Bigiel, F.; Boselli, A.; Bosma, A.; Catinella, B.; Chauhan, G.; Cluver, M. E.; Colless, M.; Courtois, H. M.; Crain, R. A.; de Blok, W. J.G.; Dénes, H.; Duffy, A. R.; Elagali, A.; Fluke, C. J.; For, B. Q.; Heald, G.; Henning, P. A.; Hess, K. M.; and Holwerda, Benne W., "WALLABY – an SKA Pathfinder H i survey" (2020). Faculty Scholarship. 476. https://ir.library.louisville.edu/faculty/476 This Article is brought to you for free and open access by ThinkIR: The University of Louisville's Institutional Repository. It has been accepted for inclusion in Faculty Scholarship by an authorized administrator of ThinkIR: The University of Louisville's Institutional Repository. For more information, please contact [email protected]. Authors Bärbel S. Koribalski, L. Staveley-Smith, T. Westmeier, P. Serra, K. Spekkens, O. -
The Unveiling of the Newly Discovered Vela Supercluster 1
The Unveiling of the newly discovered Vela Supercluster ∗ PoS(SSC2015)040 Renée C. Kraan-Korteweg†, Thomas H. Jarrett and Ahmed Elagali Astrophysics, Cosmology and Gravity Centre, University of Cape Town, 7701 Rondebosch, South Africa E-mail: [email protected] Michelle E. Cluver Department of Physics, University of the Western Cape, Bellville, South Africa Maciej Bilicki Astrophysics, Cosmology and Gravity Centre, University of Cape Town, 7701 Rondebosch, South Africa & Leiden Observatory, Leiden University, The Netherlands Matthew M. Colless Research School of Astronomy and Astrophysics, Australian National University, Canberra, Australia Multi-object spectroscopic observations of high density galaxy concentrations were obtained be- tween 2012 and 2014 with SALT, using the multi-object spectrometer (MOS) of the Robert Stobie Spectograph (RSS) on SALT. The goal was to find the missing clusters in an earlier identified ex- tended galaxy overdensity centered at ∼ 18000 km s−1 located at low Galactic latitudes in Vela. Reliable redshifts could be extracted for ∼ 80% of the targeted, highly-obscured galaxies. They were found to have an accuracy of the order of s ∼ 150 km s−1. Of the 13 observed fields, ten revealed clear signatures of galaxy clusters. The majority of the clusters form part of the Vela overdensity. Their distribution also confirmed our suspicion that the Vela overdensity is even more extended and seems to straddle the Galactic Plane. Subsequent multi-fibre spectroscopy with AAOmega+2dF on the Australian Telescope confirmed that these clusters are embedded in a gigantic overdensity of about 20◦ ×20◦ on the sky. The overdensity and its clusters show strong similarities to massive superclusters such as the Shapley Supercluster. -
Annual Report / Rapport Annuel / Jahresbericht 1996
Annual Report / Rapport annuel / Jahresbericht 1996 ✦ ✦ ✦ E U R O P E A N S O U T H E R N O B S E R V A T O R Y ES O✦ 99 COVER COUVERTURE UMSCHLAG Beta Pictoris, as observed in scattered light Beta Pictoris, observée en lumière diffusée Beta Pictoris, im Streulicht bei 1,25 µm (J- at 1.25 microns (J band) with the ESO à 1,25 microns (bande J) avec le système Band) beobachtet mit dem adaptiven opti- ADONIS adaptive optics system at the 3.6-m d’optique adaptative de l’ESO, ADONIS, au schen System ADONIS am ESO-3,6-m-Tele- telescope and the Observatoire de Grenoble télescope de 3,60 m et le coronographe de skop und dem Koronographen des Obser- coronograph. l’observatoire de Grenoble. vatoriums von Grenoble. The combination of high angular resolution La combinaison de haute résolution angu- Die Kombination von hoher Winkelauflö- (0.12 arcsec) and high dynamical range laire (0,12 arcsec) et de gamme dynamique sung (0,12 Bogensekunden) und hohem dy- (105) allows to image the disk to only 24 AU élevée (105) permet de reproduire le disque namischen Bereich (105) erlaubt es, die from the star. Inside 50 AU, the main plane jusqu’à seulement 24 UA de l’étoile. A Scheibe bis zu einem Abstand von nur 24 AE of the disk is inclined with respect to the l’intérieur de 50 UA, le plan principal du vom Stern abzubilden. Innerhalb von 50 AE outer part. Observers: J.-L. Beuzit, A.-M. -
A Kinematic Confirmation of the Hidden Vela Supercluster
MNRAS 000,1{6 (2019) Preprint 20 September 2019 Compiled using MNRAS LATEX style file v3.0 A kinematic confirmation of the hidden Vela supercluster H´el`ene M. Courtois1?, Ren´ee C. Kraan-Korteweg2, Alexandra Dupuy1, Romain Graziani1 and Noam I. Libeskind,1;3 1University of Lyon, UCB Lyon 1, CNRS/IN2P3, IP2I Lyon, France 2Department of Astronomy, University of Cape Town, Private Bag X3, 7701 Rondebosch, South Africa 3Leibniz-Institut fur¨ Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany Accepted....... ; ABSTRACT The universe region obscured by the Milky Way is very large and only future blind large HI redshift, and targeted peculiar surveys on the outer borders will determine how much mass is hidden there. Meanwhile, we apply for the first time two independent techniques to the galaxy peculiar velocity catalog CosmicF lows−3 in order to explore for the kinematic signature of a specific large-scale structure hidden behind this zone : the Vela supercluster at cz ∼ 18; 000,km s−1 . Using the gravitational velocity and density contrast fields, we find excellent agreement when comparing our results to the Vela object as traced in redshift space. The article provides the first kinematic evidence of a major mass concentration (knot of the Cosmic Web) located in the direction behind Vela constellation, pin-pointing that the Zone of Avoidance should be surveyed in detail in the future . Key words: large-scale structure of Universe 1 INTRODUCTION (sgl; sgb ∼ 173◦; −47◦)(Kraan-Korteweg et al.(2017, 2015), henceforth KK17a,b). A significant bulk flow residual was revealed in 2014 in the Radial peculiar velocities can be modeled using the analysis of the 6dF peculiar velocity survey based on 8,885 Wiener filter methodology Zaroubi et al.(1999); Hoffman galaxies in the southern hemisphere within a volume cz (2009); Courtois et al.(2012), recently re-vamped by data ≤ 16; 000 km s−1 Springob et al.(2014). -
Large-Scale Structures Behind the Southern Milky Way From
Large-Scale Structures Behind the Southern Milky Way from Observations of Partially Obscured Galaxies R.C. Kraan-Korteweg Observatoire de Paris-Meudon, D.A.E.C., 92195 Meudon Cedex, France [email protected] P.A. Woudt Dept. of Astronomy, University of Cape Town, Rondebosch 7700, South Africa P.A. Henning Dept. of Physics and Astronomy, University of New Mexico, Albuquerque, USA Abstract We report here on extragalactic large-scale structures uncovered by a deep optical survey for galaxies behind the southern Milky Way. Systematic visual inspection of the ESO/SRC- ◦ ◦ survey revealed over 10000 previously unknown galaxies in the region 265 ∼<ℓ ∼< 340 , |b| ∼< 10◦. With subsequently obtained redshifts of more than 10% of these galaxies, new structures across the Milky Way are unveiled, such as a filament at v ∼ 2500 km s−1 connecting to the Hydra and Antlia clusters, a shallow extended supercluster in Vela (∼ 6000 km s−1), and a −1 15 nearby (4882 km s ), very massive (M ∼ 2 − 5 · 10 M⊙), rich Coma-like cluster which seems to constitute the previously unidentified center of the Great Attractor. The innermost part of the Milky Way where the foreground obscuration in the blue is m 21 −2 AB ∼> 5 , respectively H I-column densities NH I ∼> 6·10 cm remains fully opaque. In this approximately 8◦ wide strip, the forthcoming blind H I-survey with the multi-beam system at Parkes will provide the only tool to unveil this part of the extragalactic sky. Keywords: galaxies: distances and redshifts - large-scale structure of Universe - surveys arXiv:astro-ph/9611099v1 13 Nov 1996 1 Introduction The Milky Way obscures about 25% of the extragalactic sky. -
A NEW SUPERCLUSTER of GALAXIES a Team of Astronomers
A NEW SUPERCLUSTER OF GALAXIES A team of astronomers from South Africa, the Netherlands, Germany, and Australia announced on November 16 the discovery of a previously unknown major concentration of galaxies in direction to the southern constellation Vela. They’ve dubbed it the Vela supercluster, and it’s one of perhaps 10 million superclusters of galaxies – vast collections of galaxies – the largest structures we know in the universe. The gravitational attraction from this newly found large mass concentration in our cosmic neighbourhood might have an important effect on the motion of our Local Group of galaxies including the Milky Way. It might also help to explain the direction and amplitude of our Local Group’s peculiar velocity with respect to the Cosmic Microwave Background. Generally speaking, superclusters are vast clusters of galaxies spanning up to 200 million light-years across the sky. They’re not isolated in space but exist together with many other smaller concentrations of galaxies, together forming parts of extensive walls of galaxies surrounding large voids in what astronomers call the cosmic web. Superclusters aren’t just big; they are also massive, meaning they have a powerful gravitational pull. They are the most massive known structures in our universe. A nearby supercluster famous for its great mass is the Shapley Supercluster, some 650 million light-years away containing two dozens of massive X-ray clusters for which thousands of Superclusters near Earth. A map of the universe within 500 million light galaxy velocities have been measured. It is years shows most of the major galaxy superclusters that surround our believed to be the largest of its kind in our Virgo supercluster. -
The Vela Supercluster: Showcasing the Need for Deep “Whole-Sky” HI-Surveys
The Vela Supercluster: showcasing the need for deep “whole-sky” HI-surveys Renée C. Kraan-Korteweg ACGC (Astrophysics, Cosmology and Gravity Centre), UCT Michelle Cluver, Tom Jarrett, Maciej Bilicki, Matthew Colless, Ahmed Elagali & Ed Elson Ø Discovery of major supercluster hidden by ZOA Ø Implications Ø Whole sky-surveys and the ZOA Ø A Vela SCL MeerKAT survey scenario (with Ed Elson) 8th PHISCC meeting Rutgers, March 2015 Suspicion of existence of massive overdensity in ZOA just beyond boundaries of current surveys 16-22000km/s Follow-up redshift observations of optically detected galaxies in ZOA in Vela (KK et al) With 6dF instrument à SALT & AAOmega proposals to consolidate & map extent of overdensity (with M Cluver, T Jarrett, M Bilicki, M Colless) à SALT & AAOmega observations of optically and 2M galaxies to map extent of overdensity (l,b) = 240° – 290°; ± (4°-10°) SALT 10m & RSS: AT 4m & AAOmega: 8’ field: N~25 2° field; N ~400 2012-2103: 2014: 6 nights in February: à About a dozen fields of prospective cluster cores à Most confirmed as clusters at Vela à 4300 redshifts in 25 AAOmega fields: overdensity distance overdensity extends over vast region Preliminary results from 1 - 6 Feb 2014 AAOmega Observing run: 25 x 2-deg fields observed à N ~ 4300 redshifts Massive overdensity: traced over ~ 20 o/o 25 observed fields - Velocity histogram shows highly significant peak centred at ~18000km/s - just beyond boundaries of current surveys 16-22000km/s - Overdensity equally prominent above an below optical ZOA - Numerous clusters at 18-20000km/s -
Overview of Uncovered and Suspected Large-Scale Structures Behind the Milky Way
Publ. Astron. Soc. Aust., 1999, 16, 53–9. Overview of Uncovered and Suspected Large-scale Structures behind the Milky Way Renee C. Kraan-Korteweg1 and Patrick A. Woudt2 1 Depto. de Astronoma, Univ. de Guanajuato, Apartado Postal 144, Guanajuato, GTO 36000, Mexico [email protected] 2 ESO, Karl-Schwarzschildstr. 2, D-85748 Garching bei Munchen, Germany [email protected] Received 1998 November 2, accepted 1999 February 1 Abstract: Various dynamically important extragalactic large-scale structures in the local Universe lie behind the Milky Way. Most of these structures (predicted and unexpected) have only recently been made ‘visible’ through dedicated deep surveys at various wavelengths. The wide range of observational searches (optical, near infrared, far infrared, radio and X-ray) for galaxies in the Zone of Avoidance (ZOA) will be reviewed and the uncovered and suspected large-scale structures summarised. Particular emphasis is given to the Great Attractor region where the existence of yet another cluster is suspected (Woudt 1998). Predictions from reconstructions of the density eld in the ZOA are discussed and compared with observational evidence. Although no major structures are predicted out to about v < 10, 000 km s 1 for which no observational evidence exists, the comparison between reconstructed density elds and the observed galaxy distribution remain important as they allow derivations of the density and biasing parameters. Keywords: zone of avoidance — surveys — ISM: dust, extinction — large-scale structure of universe 1 Introduction 2 Observational Surveys in Zone of Avoidance In the last few years, much progress has been 2.1 Optical Surveys achieved in uncovering the galaxy distribution behind the Milky Way through various multi-wavelength Systematic optical galaxy catalogues are generally approaches. -
36Th International Cosmic Ray Conference
36th International Cosmic Ray Conference (ICRC2019) Madison , Wisconsin, USA 24 July - 1 August 2019 Volume 1 of 10 ISBN: 978-1-7138-0206-8 Printed from e-media with permission by: Curran Associates, Inc. 57 Morehouse Lane Red Hook, NY 12571 Some format issues inherent in the e-media version may also appear in this print version. Copyright© (2019) by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0). https://creativecommons.org/licenses/by-nc-nd/4.0/ All rights reserved. Printed with permission by Curran Associates, Inc. (2020) For permission requests, please contact International Union of Pure and Applied Physics (IUPAP) at the address below. International Union of Pure and Applied Physics (IUPAP) Nanyang Technological University Nanyang Executive Centre #04-09 60 Nanyang View Singapore 639673 Phone: +65 6792 7784 https://iupap.org/ Additional copies of this publication are available from: Curran Associates, Inc. 57 Morehouse Lane Red Hook, NY 12571 USA Phone: 845-758-0400 Fax: 845-758-2633 Email: [email protected] Web: www.proceedings.com TABLE OF CONTENTS VOLUME 1 HIGHLIGHT TALKS THE CALORIMETRIC ELECTRON TELESCOPE (CALET) ON THE INTERNATIONAL SPACE STATION ............................................................................................................................................... 1 Y. Asaoka MULTI-MESSENGER OBSERVATIONS OF GRBS: THE GW CONNECTION ......................................... 17 E. Bissaldi HIGHLIGHTS FROM THE