DOCSLIB.ORG

Deep-Sky Dedication

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Deep-Sky Dedication Deep-sky dedication Magda Streicher e-mail: magda@pixie.co.za Introduction Whenever I phoned Danie Overbeek, it was have known him. His words after my success answered with a brief identification “Danie” with asteroid Astrea still echo in my ears: at the other end, always followed with a note “You have not only m ade an observation, but of joy in his lovely deep voice and a friendly also a worthwhile scientific measurement, “Magda, it’s good to hear from you!” Danie well done!” Some of his last written words Overbeck was my motivation and inspiration were most appropriate: “1 shall now bow out for many years and it was truly a privilege to gracefully.” Danie, we miss you. 140 mnassa vol 62 nos 5 & 6 proceedings of the fifth symposium My observatory is situated in the North­ were first described by James Dunlop or ern Province, at latitude 23°53.9 South, lon­ John Herschel, and I have found it interest­ gitude 29°28.3 Hast, just north of the Tropic ing to revisit these objects and compare my of Capricorn. The observatory is located far own observations. from any major metropolitan areas. Using 20cm and 30cm Schmidt-Cassegrain tele­ The Objects scopes this location enables me to do much I will describe the following twelve objects: useful deep-sky observing, which 1 have NGC 6826 Blinking nebula in Cygnus done with great passion and satisfaction over NGC 1554/5 Hind’s Variable Nebula the past ten years. I have written up all my NGC 3228 cluster in Vela observations, and wherever possible sket­ NGC 6204 cluster in Ara ched the objects for future study. With this NGC 5281 cluster in Centaurus presentation I would like to show a sample NGC 4609 cluster in Crux of my results, focusing on some more north­ NGC 4439 cluster in Crux ern objects and a few rarely known open NGC 272 asterism in Andromeda clusters, and urge other amateurs to develop NGC 1963 galaxy & asterism in Columba their own observing programs. NGC 2017 multiple star in Lepus ‘Mini Coat Hanger’ asterism in UMi Selection of objects ‘Stargate' asterism in Corvus Firstly, 1 have opted for a discussion of some northern deep-sky objects, and though these NGC 6826 in Cygnus are not necessarily bright objects, they do Blinking Planetary Nebula, RA 19h 44.8 Dec have certain exceptional and unique charac­ +50° 31' teristics. Kach one can be described as spe­ Magnitude 9.8 and Size 2.3' cial and a challenge, especially when they Telescope: 8-inch Schmidt-Cassegrain f/10, are situated fairly close to the northern hori­ 26mm Super Plossl x77, fov40.6' and 18mm zon. Secondly I have opted for a few inter­ Super W ide x l 11, fov 36.2' esting clusters and asterisms. Many of these NGC 6826 is a fine bright green-bluish James Dunlop Sir John Herschel Scotsman James Dunlop was bom on 31 Oc­ John Friedrich William Herschel, was bom tober 1793 at Dairy, near Glasgow, and 33 on 7 March 1792 at Slough near Windsor Cas­ years later found him in Australia, at the eye­ tle, the only son of William. After revising piece of a 9-inch f/12 reflector searching the his father’s observations of the skies visible southern sky for nebulae and clusters. Dun­ from Slough, Herschel spent the years 1834- lop constructed the telescope himself, mak­ 1838 surveying the southern stars from the ing the mirror from burnished me (a I (specu­ Cape of Good Hope. He published a consol­ lum) using methods similar to Herschel. His idated catalogue of over five thousand nebu­ sky survey produced a catalogue of 629 ob­ lae and clusters. He died at his home in Kent jects, for which he was awarded the prestig­ on 11 May 1871 and was buried in Westmin­ ious Gold Medal of the Royal Astronomical ster Abbey. Society in February 1828. 141 june 2003 proceedings of the fifth symposium planetary a little elongated east-southeast and Hind’s Variable Nebula is a reflection/ west-northwest. The planetary displays a emission nebula associated with the varia­ non-stellar blob in the Milky Way with a ble star T Tauri. This 9.8 magnitude star has bright 10.6 magnitude central star. This beau­ a definite pinpoint appearance, with an ex­ tiful nebula certainly blinks as its name tremely famt, gentle north-south arc, close states. To the eye it brightens up to a star- to its western side. The nebula is somewhat like point just to fade out again like a hazy dimmer towards the centre, which explains patch o f light. The nebula exhibits a soft disk its two NGC numbers. Mr. Jan Hers indicat­ with a hint of an outer envelope. Mr. Mul- ed to me that the nebula was approximately laney indicates to stare directly at the centre 12.5 magnitude at the stated date in Febru­ of the star-like core of the planetary until the ary 1999. J.R. Hind discovered the nebula brightness overwhelm s the eye, and the neb­ in the year 1852; it faded from view in 1868 ula disappears. However, using averted vi­ and did not reappear until 1890. sion, the nearby 9.5 magnitude star to the southwest suddenly reappears. Our Presi­ NGC 3228 Dunlop 386 in Vela dent, Tim Cooper, does not agree whole­ Open Cluster RA lOh 2 1.8 Dec -51° 43' heartedly with me but he nevertheless de­ Magnitude 6.0 and Size 18' scribed it as a fine object. Telescope: 12-inch Meade Schmidt-Casseg­ Steve Coe commented to look directly at rain f/10, 40mm Super Wide x76, fov 52.8' the planetary, the central star is prominent and 14mm Ultra Wide x218, fov 23.1' within the greenish nebulosity. Using avert­ An impressive small grouping of bright ed vision, the nebula appears brighter and stars with a distinctive formation that strong­ overwhelms the star. Alternating between ly reminds me of a daisy flower and stem. It direct and averted vision will produce a displays an overall brightness of approxi­ blinking on then off that is fascinating. There mately 6,b to 7th magnitude, unattached to are several other planetary nebulae that have each other and strongly defined against the the right central star to the nebula brightness background stars. Towards the south of this to show of this effect. little flower cluster with higher magnifica­ William Herschel discovered this plane­ tion, more fainter stars can be seen which tary in 1793. My fortunate position in South could be part of this whole cluster, giving it Africa has enabled me to easily locate the an elongated shape in another context. The nebula. The Blinking nebula is at declina­ cluster of approximately nine outstanding tion +50°; my most northerly objcct visible stars fills the middle section of my field of in the night sky is at declination +57". view in a north-south direction. Bright and outstanding just like a summer daisy in NGC 1554/5 in Taurus bloom. Hinds Nebula RA 04h 21.8 Dec +19° 32’ Magnitude when observed 12-13, Size 0.5' NGC 6204 Dunlop 442 in Ara Date: 14 February 1999 Open Cluster RA 16h 46.5 Dec -47° 01' Telescope: 8-inch Schmidt-Cassegrain f/10, Magnitude 8.2 and Size 5' 26mm Super Plossl x77, fov 40.6' and 18mm To me, one of the most outstanding com­ Super Wide xl 11, fov 36.2’ positions, two groupings can be seen. The 142 mnassa vol 62 nos 5 & 6 proceedings of the fifth symposium group toward the cast is virtually a Jong er stars, form a gently curved line forming string, w hich drapes from north to south in a the shape of a cross. Only one star is a little perfect oval. Outstanding is the top bright askew from the almost perfect “cross”. This cluster contains about forty stars with the brightest star at 6.6 magnitude. Although NGC 5269 is situated twelve minutes to the west in a busy star-field, it could well be the one and same bright NGC 5281 cluster. John Hcrschel described it as a fine rich Milky Way group, or an outlying cluster of a much finer cluster following it. NGC 4609 Dunlop 272 in Crux Open Cluster RA 12h42.3 Dec -62° 58' Magnitude 6.9, Size 5' The cluster lies in a starry part of the Coal Sack dark nebula just northwest of the red­ dish magnitude 5 star HD 110432. Cluster looks like an artistic style impression of a comct. The star forms the nucleus and the star, situated in the south, and as the stars in cluster the tail to the northwest. The cluster the line progress they become fainter with members accompany the star, extend away the least faint one ending the line at the bot­ and spray out to the northwest forming an tom. Six fainter stars toward the eastern side irregular triangle. At both the south and represent a perfect question mark, with a northern end of the grouping lies a small tri­ faint star to the fullstop beneath it. angle of stars. NGC’ 5281 Dunlop 273 Centaurus NGC 4439 Duniop 300 in Crux Open Cluster RA 13h 46.6 Dec -62° 54' Open Cluster RA 12h 28.4 Dec -60 06' Magnitude 5.9, size 5' Magnitude 8.0 and Size 4' Date: June 2000 and May 2002 Telescope: 12-inch Meade Schmidt-Casseg- Telescope: 8-inch Schmidt-Cassegrainf/10, rain f/10, 40mm Super Wide x76, fov 52.8’ 26mm Super Plossl x77, fov 40.6' and 18mm and 14mm Ultra Wide x218, fov 23.1' Super Wide x lII, fov 36.2' Approximately eleven stars resemble a Telescope: 12-inch Meade Schmidt-Casseg- dome-shape that is quite outstanding from rain f/10, 40mm Super Wide x76, fov 52.8’ that of the background star-field.
Load more

Recommended publications
  • The Sky This Month
    The sky this month May 2020 By Joe Grida, Technical Informaon Officer, ASSA (technical@assa.org.au) irst of all, an apology. Pressures of work now preclude me from producing this guide every week. So, from now on it will be monthly. It is designed to keep you looking up during these rather uncertain mes. We F can’t get together for Members’ Viewing Nights, so I thought I’d write this to give you some ideas of observing targets that you can chase on any clear night this coming month. Stargazing is something that we all like to do. Cavemen did it many thousands of years ago, and we sll do it. There’s something rather special in looking into a dark sky and seeing all those stars. It’s more meaningful now. We don’t have to assign god-like powers to any of those stars for we now know what they really are, and I think that makes it even more awesome to look up at a star-studded sky. Keep looking up! Naked eye star walk Later in the evening on the night of May 7th, look high up the eastern sky. The Full Moon will be below and slightly right of a star with one of my very favourite star names - Zubenelgenubi. The Arabic name "Zubenelgenubi" means the "the southern claw." Thousands of years ago, it and the star that stands above it and to the right; Zubeneschamali, the northern claw; were part of Scorpius, the scorpion. But later, they were stripped away and assigned to a new constellaon: Libra, the balance scales.
    [Show full text]
  • ASSA SYMPOSIUM 2002 - Magda Streicher
    ASSA SYMPOSIUM 2002 - Magda Streicher Deep Sky Dedication Magda Streicher ASSA SYMPOSIUM 2002 - Magda Streicher Deep Sky Dedication • Introduction • Selection of Objects • The Objects • My Observing Programs • Conclusions ASSA SYMPOSIUM 2002 - Magda Streicher Table 1 List of Objects NGC 6826 Blinking nebula in Cygnus NGC 1554/5 Hind’s Variable Nebula in Taurus NGC 3228 cluster in Vela NGC 6204 cluster in Ara NGC 5281 cluster in Centaurus NGC 4609 cluster in Crux NGC 4439 cluster in Crux NGC 272 asterism in Andromeda NGC 1963 galaxy and asterism in Columba NGC 2017 multiple star in Lepus ‘Mini Coat Hanger’ asterism in Ursa Minor ‘Stargate’ asterism in Corvus ASSA SYMPOSIUM 2002 - Magda Streicher James Dunlop • Born 31/10/1793 • Dalry, near Glasgow • 9” f/12 reflector • Catalogue of 629 objects ASSA SYMPOSIUM 2002 - Magda Streicher John Herschel • Born 7/3/1792 • Slough, near Windsor • Cape 1834-38 • Catalogued over 5000 objects • Died 11/5/1871 ASSA SYMPOSIUM 2002 - Magda Streicher NGC6826 Blinking Nebula in Cygnus RA19h44.8 Dec +50º 31 Magnitude 9.8 Size 2.3’ Through the eyepiece of my best friend, the telescope, millions of light points share in togetherness, our own sun, suddenly pale and alone. ASSA SYMPOSIUM 2002 - Magda Streicher NGC1554/55 Hind’s Variable Nebula in Taurus RA04h21.8 Dec +19º 32 Magnitude 12-13 Size 0.5’ The beauty of the night skies filled my life with share wonder and in a way I think share the closeness with me. ASSA SYMPOSIUM 2002 - Magda Streicher NGC3228 Open Cluster Dunlop 386 In Vela RA10h21.8 Dec -51º 43 Magnitude 6.0 Size 18’ Many of us have wished upon the first star spotted in the evening twilight because there is something special about looking at the stars.
    [Show full text]
  • On the X-Ray and Optical Properties of the Be Star HD 110432: a Very Hard-Thermal X-Ray Emitter
    On the X-ray and optical properties of the Be star HD 110432: a very hard-thermal X-ray emitter Raimundo LOPES DE OLIVEIRA Filho (1,2), Christian MOTCH (2), Myron A. SMITH (3), Ignacio NEGUERUELA (4) and Jose M. TORREJON (4) (1) Instituto de Astronomia, Geof'{i}sica e Ci^encias Atmosf'ericas, Universidade de S~ao Paulo, Brazil; (2) Observatoire Astronomique de Strasbourg, Universit'e Louis Pasteur, France; (3) Catholic University of America, USA; (4) Universidad de Alicante, Spain HD 110432 is the first proposed, and best studied, member of a growing group of Be stars with X-ray properties similar to $gamma$ Cas. These stars exhibit hard-thermal X-rays that are variable on all measurable timescales. This emission contrasts with the soft emission of ``normal" massive stars and with the nonthermal emission of all well known Be/X-ray binaries -- so far, all Be + neutron star systems. In this work we present X-ray spectral and timing properties of HD 110432 from three XMM-{it Newton} observations in addition to new optical spectroscopic observations. Like $gamma$ Cas, the X-rays of HD 110432 appear to have a thermal origin, as supported by strongly ionized FeXXV and FeXXVI lines detected in emission. A fluorescent iron feature at 6.4 keV is present in all observations, while the FeXXVI Ly$beta$ line is present in two of them. Its X-ray spectrum, complex and time variable, is well described in each observation by three thermal plasmas with temperatures ranging between 0.2--0.7, 3--6, and 16--37 keV.
    [Show full text]
  • Central Coast Astronomy Virtual Star Party January 16Th 7Pm Pacific
    Central Coast Astronomy Virtual Star Party January 16th 7pm Pacific Welcome to our Virtual Star Gazing session! We’ll be focusing on objects you can see with binoculars or a small telescope, so after our session, you can simply walk outside, look up, and understand what you’re looking at. CCAS President Aurora Lipper and astronomer Kent Wallace will bring you a virtual “tour of the night sky” where you can discover, learn, and ask questions as we go along! All you need is an internet connection. You can use an iPad, laptop, computer or cell phone. When 7pm on Saturday night rolls around, click the link on our website to join our class. CentralCoastAstronomy.org/stargaze Before our session starts: Step 1: Download your free map of the night sky: SkyMaps.com They have it available for Northern and Southern hemispheres. Step 2: Print out this document and use it to take notes during our time on Saturday. This document highlights the objects we will focus on in our session together. Celestial Objects: Moon: The moon is 3 days past new, which is really good for star gazing. Be sure to look at the moon tonight with your naked eyes and/or binoculars! Mercury is rising into the western sky and may be a good target near the end of the month. Mars is up high but is shrinking in size as the weeks progress. *Image credit: all astrophotography images are courtesy of NASA unless otherwise noted. All planetarium images are courtesy of Stellarium. Central Coast Astronomy CentralCoastAstronomy.org Page 1 Main Focus for the Session: 1.
    [Show full text]
  • XVI. Astrometric Measurements of Visual Binaries in 2015, and New Orbits for DUN 5, ADS 5958, 6276, 7294, 8211, and 13169 M
    Speckle observations with PISCO in Merate (Italy): XVI. Astrometric measurements of visual binaries in 2015, and new orbits for DUN 5, ADS 5958, 6276, 7294, 8211, and 13169 M. Scardia, Jean-Louis Prieur, L. Pansecchi, R. Argyle, A. Zanutta, E. Aristidi To cite this version: M. Scardia, Jean-Louis Prieur, L. Pansecchi, R. Argyle, A. Zanutta, et al.. Speckle observations with PISCO in Merate (Italy): XVI. Astrometric measurements of visual binaries in 2015, and new orbits for DUN 5, ADS 5958, 6276, 7294, 8211, and 13169. Astronomical Notes / Astronomische Nachrichten, Wiley-VCH Verlag, 2018, 339 (7-8), pp.571-585. 10.1002/asna.201813494. hal-02357166 HAL Id: hal-02357166 https://hal.archives-ouvertes.fr/hal-02357166 Submitted on 9 Nov 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Astron. Nachr. / AN 000, No.00, 1–15 (0000) / DOI please set DOI! Speckle observations with PISCO in Merate (Italy): XVI. Astrometric measurements of visual binaries in 2015, and new orbits for DUN 5, ADS 5958, 6276, 7294, 8211 and 13169. M. Scardia1, J.-L. Prieur2,3, L. Pansecchi1, R.W. Argyle4, A. Zanutta1, and E.
    [Show full text]
  • Multiwavelength, Machine Learning, and Parallax Studies of X-Ray Binaries in Three Local Group Galaxies
    Western University Scholarship@Western Electronic Thesis and Dissertation Repository 12-7-2018 1:30 PM Multiwavelength, Machine Learning, and Parallax Studies of X-ray Binaries in Three Local Group Galaxies Robin Arnason The University of Western Ontario Supervisor Barmby, Pauline The University of Western Ontario Graduate Program in Astronomy A thesis submitted in partial fulfillment of the equirr ements for the degree in Doctor of Philosophy © Robin Arnason 2018 Follow this and additional works at: https://ir.lib.uwo.ca/etd Part of the External Galaxies Commons Recommended Citation Arnason, Robin, "Multiwavelength, Machine Learning, and Parallax Studies of X-ray Binaries in Three Local Group Galaxies" (2018). Electronic Thesis and Dissertation Repository. 5931. https://ir.lib.uwo.ca/etd/5931 This Dissertation/Thesis is brought to you for free and open access by Scholarship@Western. It has been accepted for inclusion in Electronic Thesis and Dissertation Repository by an authorized administrator of Scholarship@Western. For more information, please contact wlswadmin@uwo.ca. Abstract X-ray binary stars are rare systems consisting of a black hole or neutron star and a main- sequence companion star. They are useful probes of galaxy properties and interesting labora- tories for extreme physical conditions. In this thesis, I investigated the X-ray binary population of three galaxies in the Local Group. The Sculptor Dwarf Spheroidal Galaxy offers the chance to study a primordial low-mass X-ray binary (LMXB) population in an isolated, low-metallicity environment. Combining X- ray, optical, and infrared observations, I have studied nine previously identified and discovered four additional LMXB candidates in this galaxy.
    [Show full text]
  • Exótico Cielo Profundo 15
    15 Joyas por Crux Centaurus (Cen), Crux (Cru), Musca (Mus) · Exótico Cielo Profundo 15 de Rodolfo Ferraiuolo y Enzo De Bernardini Constelación Centaurus (Cen) Crux (Cru) Musca (Mus) Época Otoño Austral PK 300-0.1 NGC 4463 PK 300-1.1 PK 300-2.1 Ru 105 Tr 20 Objetos NGC 4609 Hogg 15 Saco de Carbón NGC 4755 NGC 4815 NGC 4852 La Cruz del Sur o Crux, la más pequeña de las 88 constelaciones que forman el firmamento, posee varias joyas nocturnas y, en esta ocasión estudiaremos algunas de ellas, más otras en Centaurus y Musca. Vamos a rodear e incursionar dentro de la afamada nebulosa oscura bautizada Saco de Carbón, observando, además de ella, variados cúmulos estelares y, unas pocas y dificultosas nebulosas planetarias. Estos objetos fueron elegidos entre muchos más de este tipo en el área y, esperamos les agraden. Esta fantástica región del ecuador galáctico, es atravesada por la Asociación Centaurus Inferior-Crux, parte de asociación estelar más cercana al Sol, denominada Asociación Scorpius-Centaurus OB 1 y, gran parte de las brillantes estrellas de la zona son miembros de ella. Nuestro punto de partida será el conocido y hermoso cúmulo estelar abierto o galáctico NGC 4755, hallado sobre una rica y bella zona estelar, a menos de un grado al sudeste de la estrella binaria y variable, de mag. 1,3, beta (β) Crucis, Mimosa o Becrux, haciendo muy fácil su localización. Fue catalogado por Bayer, en 1603, como estrella individual y, descripto como "la estrella nebulosa kappa". En el año 1752, el Abad y astrónomo rumano-francés Nicolás Louis de Lacaille o Nicolai-Ludovici De La Caille, descubre este objeto como agrupación estelar, con un telescopio refractor de media pulgada, desde Sudáfrica; incluyéndolo como uno de los 42 objetos de su catálogo de 1755, Sur les étoiles nébuleuses du ciel austral, en las Memorias de la Real Academia de las Ciencias de Paris, Francia.
    [Show full text]
  • The Southern Double Stars of Carl Rümker I: History, Identification, Accuracy
    Vol. 13 No. 2 April 1, 2017 Journal of Double Star Observations Page 220 The Southern Double Stars of Carl Rümker I: History, Identification, Accuracy Roderick R. Letchford,1 Graeme L. White,2 Allan D. Ernest3 1. Vianney College Seminary, Wagga Wagga NSW, Australia, rodvianney@yahoo.com.au 2. Astrophysics Group, Computational Engineering and Science Research Centre, University of Southern Queensland, Toowoomba, Australia QLD 4350, graemewhiteau@gmail.com 3. Charles Sturt University, Wagga Wagga NSW, Australia, aernest@csu.edu.au Abstract: The second catalog of southern double stars was published by Carl Rümker 1832. We describe this catalog, obtain modern nomenclature and data and estimate the accuracy of his positions for the primary components. We have shown the equinox and epoch to be B1827.0. Of the 28 pairs, 27 could be identified. RMK 23 is RMK 22 and RMK 24 could not be identified. Five pairs observed by Rümker are credited to co-worker Dunlop (DUN) in the WDS. There are two typographical errors. We tentatively identify RMK 28 with COO 261. We have shown the positional data in the 1832 catalog to be accurate and we present a modern/revised version of Rümker’s catalog. Introduction The finding, cataloging, and astrometric study of double stars dominated the astronomy of the 19th centu- ry. In the southern sky, the pioneering double stars work of Sir John Herschel (JH) in the 1830-40s is rec- ognized for its accuracy and completeness. However, some two decades prior to the work of JH, a small but well equipped privately owned observa- tory was established in the fledgling British Colony of New South Wales by Sir Thomas Makdougall Bris- bane, the 6th Governor of the Colony.
    [Show full text]
  • Early Australian Optical and Radio Observations of Centaurus A
    CSIRO PUBLISHING Publications of the Astronomical Society of Australia, 2010, 27, 402–430 www.publish.csiro.au/journals/pasa Early Australian Optical and Radio Observations of Centaurus A Peter RobertsonA,C, Glen CozensA, Wayne OrchistonA, Bruce SleeA,B, and Harry WendtA A Centre for Astronomy, James Cook University, Townsville, Qld 4811, Australia B CSIRO Astronomy and Space Sciences, PO Box 76, Epping, NSW 2121, Australia C Corresponding author. Email: peter.robertson@jcu.edu.au Received 2009 October 8, accepted 2009 December 8 Abstract: The discovery of the radio source Centaurus A and its optical counterpart NGC 5128 were important landmarks in the history of Australian astronomy. NGC 5128 was first observed in August 1826 by James Dunlop during a survey of southern objects at the Parramatta Observatory, west of the settlement at Sydney Cove. The observatory had been founded a few years earlier by Thomas Brisbane, the new governor of the British colony of New South Wales. Just over 120 years later, John Bolton, Gordon Stanley and Bruce Slee discovered the radio source Centaurus A at the Dover Heights field station in Sydney, operated by CSIRO’s Radiophysics Laboratory (the forerunner to CSIRO Astronomy and Space Sciences). This paper will describe this early historical work and summarize further studies of Centaurus A by other Radiophysics groups up to 1960. Keywords: Centaurus A — NGC 5128 — radio galaxies — history of Australian astronomy — Parramatta Observatory — Radiophysics Laboratory 1 Introduction different nature began at Dover Heights in Sydney, the site The radio source Centaurus A and its optical counterpart of a former wartime radar research station operated by the NGC 5128 comprise possibly the most important astro- Radiophysics Laboratory.
    [Show full text]
  • An Analysis of the First Three Catalogues of Southern Star Clusters and Nebulae
    ResearchOnline@JCU This file is part of the following reference: Cozens, Glendyn John (2008) An analysis of the first three catalogues of southern star clusters and nebulae. PhD thesis, James Cook University. Access to this file is available from: http://eprints.jcu.edu.au/24051/ The author has certified to JCU that they have made a reasonable effort to gain permission and acknowledge the owner of any third party copyright material included in this document. If you believe that this is not the case, please contact ResearchOnline@jcu.edu.au and quote http://eprints.jcu.edu.au/24051/ Nicolas-Louis de La Caille, James Dunlop and John Herschel – An analysis of the First Three Catalogues of Southern Star Clusters and Nebulae Thesis submitted by Glendyn John COZENS BSc London, DipEd Adelaide in June 2008 for the degree of Doctor of Philosophy in the Faculty of Science, Engineering and Information Technology James Cook University STATEMENT OF ACCESS I, the undersigned, author of this work, understand that James Cook University will make this thesis available for use within the University Library and, via the Australian Digital Theses network, for use elsewhere. I understand that, as an unpublished work, a thesis has significant protection under the Copyright Act and; I do not wish to place any further restriction on access to this work. ____________________ Signature Date ii STATEMENT OF SOURCES DECLARATION I declare that this thesis is my own work and has not been submitted in any form for another degree or diploma at any university or other institution of tertiary education. Information derived from the published or unpublished work of others has been acknowledged in the text and a list of references is given.
    [Show full text]
  • Evidence of an Asymmetrical Keplerian Disk in the Br and He I
    Evidence of an asymmetrical Keplerian disk in the Brγ and He I emission lines around the Be star HD 110432 Philippe Stee, A. Meilland, Ph. Bendjoya, F. Millour, M. Smith, A. Spang, G. Duvert, K.-H. Hofmann, F. Massi To cite this version: Philippe Stee, A. Meilland, Ph. Bendjoya, F. Millour, M. Smith, et al.. Evidence of an asymmetrical Keplerian disk in the Brγ and He I emission lines around the Be star HD 110432. 2012. hal-00773038 HAL Id: hal-00773038 https://hal.archives-ouvertes.fr/hal-00773038 Preprint submitted on 13 Jan 2013 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Astronomy & Astrophysics manuscript no. hd110432˙final c ESO 2013 January 13, 2013 Evidence of an asymmetrical Keplerian disk in the Brγ and He I emission lines around the Be star HD 110432⋆ Ph. Stee1, A. Meilland1,2, Ph. Bendjoya1 , F. Millour1, M. Smith3, A. Spang1, G. Duvert4, K.-H. Hofmann5, F. Massi6 1 Laboratoire Lagrange, UMR 7293 Universit´ede Nice-Sophia Antipolis (UNS), Observatoire de la Cˆote dAzur (OCA), Boulevard de l’Observatoire, B.P. 4229 F, 06304 Nice Cedex 4, France.
    [Show full text]
  • New Gemini Images Contrast the Late Evolution of Two Very Different Stars 5 June 2006
    New Gemini Images Contrast the Late Evolution of Two Very Different Stars 5 June 2006 Dominion Astrophysical Observatory in Canada. Its creators praise the performance of GMOS. Professor James Dunlop of the University of Edinburgh, current Chair of Gemini Science Committee, said “The Gemini telescope using GMOS is unrivalled in its ability to take stunning images of distant phenomena in our Galaxy and beyond.” UK membership of Gemini is funded by the Particle Physics and Astronomy Research Council (PPARC), which also operates the UK ATC. A Rare and Massive Star The first image shows the emission nebula NGC NGC 6164-5 imaged at Gemini South . Travis Rector 6164-5, a rectangular, bipolar cloud with rounded University of Alaska Anchorage. corners and a diagonal bar producing an inverted S- shaped appearance. It lies about 1,300 parsecs (4,200 light-years) away in the constellation Norma. The nebula measures about 1.3 parsecs (4.2 light- Two new images from the Gemini Observatory years) across, and contains gases ejected by the released today at the American Astronomical star HD 148937 at its heart. This star is 40 times Society meeting in Calgary, Canada, show a pair more massive than the Sun, and at about three to of beautiful nebulae that were created by two very four million years of age, is past the middle of its life different types of stars at what may be similar span. Stars this massive usually live to be only points in their evolutionary timelines. about six million years old, so HD 148397 is aging fast.
    [Show full text]