M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T

Total Page:16

File Type:pdf, Size:1020Kb

M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T THE VIBRATING UNIVERSE M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Audio: Blitz - I love you, man 0 Sound is a vibration M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Thunderstorms create light and vibrations. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell https://www.youtube.com/watch?v=KgIKVWGLUUo&t=668s 1 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Auroras are lights formed in Earth’s atmosphere when hit by energy from the Sun. They also create light and vibrations. [Real radio sound] M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Auroras M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Stephane Vetter - Iceland Video: Chris Tandy - Aurora Borealis in Norway Audio: European Space Agency 2 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Let’s leave Earth on a rocket! M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: ChrisIMAX Tandy - Aurora Borealis in Norway Audio: European Space Agency 3 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Let’s travel super fast to the Sun ! M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell 4 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Light travels at 186,000 miles per sec The light of the Sun takes 8 minutes to reach us. It’s that far away ! M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell The Sun M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell SDO/NASA The Sun is the star of our Solar System. It is made of hot gas. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell The Sun is just 1 of around 200,000,000,000 stars in our galaxy ! M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Gas in the Sun acts like boiling water. The ‘bubbles’ in the Sun create earthquakes that make it vibrate. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: Youtube Audio: freesfx 5 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Let’s feel the vibrations of the Sun ! [Simulated sound] M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: NASA/SDO Audio: European Space Agency 6 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell The Sun also has explosions. Humans have spacecraft taking pictures of these explosions. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Explosions happen everyday and pose no risk. But when captured by a camera, they can be transformed into funny vibrations. [Simulated sound] M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: SDO/NASA Audio: Robert Alexander 7 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell The explosions of the Sun can reach planet Jupiter. Spacecraft near Jupiter have been able to detect the explosions when they reach the planet. [Real radio signals] M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: NASA/HST Audio: NASA/JPL/Bowshock 8 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Planet Saturn produces its own energy which makes it vibrate ! Let’s feel it ! [Real radio signal] M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: Steven Van Vuuren Audio: NASA 9 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Humans have a spacecraft orbiting around Saturn and it has crossed through the rings! The rings of planet are made of tiny particles of dust and ice. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell When crossing the rings the spacecraft was hit by thousands of tiny particles! [Impacts converted into sound] M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: Steven Van Vuuren Audio: ESA/NASA/Cassini 10 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Now let’s travel to the closest stars from the Sun, called Alpha Centauri A and B. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell A race car would take 57 million years to reach Alpha Centauri A or B! M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Light from our Sun takes 4 years to reach Alpha Centauri A and B. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Let’s travel faster than light out of our Solar System ! M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: European Southern Observatory 11 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Stars Alpha Centauri A and B are similar in size to our Sun. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell All stars in the night sky also vibrate because of their hot gas ‘bubbling’, like boiling water in a pan. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell We can detect their vibrations. The vibrations from each star are different. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: European Southern Observatory Audio: astroseismology.org Alpha Centauri A 12 Alpha Centauri A M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: European Southern Observatory Audio: astroseismology.org Alpha Centauri B 13 Alpha Centauri B M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell There are stars that are smaller than the Sun. Smaller stars vibrate differently from larger stars. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: European Space Agency Audio: astroseismology.org White dwarf GD 358 14 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: European Space Agency Audio: astroseismology.org White dwarf BPM 37093 15 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell A group of billions of stars is called a galaxy. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Credit: Wikipedia Our galaxy is called the Milky Way. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Let’s travel outside the Milky Way! And feel the vibrations of stars that are even farther away and make up other galaxies! M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: European Space Agency Audio: NASA 16 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Stars much bigger than the Sun end their life with a huge explosion called a supernova. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Spaghetti Nebula: Emil Ivanov Supernova M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell A supernova throws all the hot gas of a star into outer space. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Let’s feel what the gas left over from a supernova explosion vibrates like. [Simulated, not recorded] M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: European Space Agency Audio: Paul Francis Vela Supernova 17 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell The Universe was created 14 billion years ago with the Big Bang. Nothing existed before our Universe. The Big Bang made everything from nothingness. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell After the Big Bang the Universe was very very hot ! M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell But it quickly started to cool down. Now it is around -453˚ Fahrenheit. Brrrrrr ! M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Credit: WMAP This is a map of the temperature of the Universe. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Credit: WMAP Blue areas are colder, red areas are hotter. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Scientists can turn the colder and hotter areas of the map into vibrations. [Simulated, not recorded]. M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T. Mitchell Video: NASA Goddard Audio: John Cramer Cosmic Microwave Background 18 M.A. De Leo-Winkler · G. Wilson · W. Green L. Chute · E. Henderson · T.
Recommended publications
  • Astronomy Astrophysics
    A&A 432, 219–224 (2005) Astronomy DOI: 10.1051/0004-6361:20041125 & c ESO 2005 Astrophysics Whole Earth Telescope observations of BPM 37093: A seismological test of crystallization theory in white dwarfs A. Kanaan1, A. Nitta2,D.E.Winget3,S.O.Kepler4, M. H. Montgomery5,3,T.S.Metcalfe6,3, H. Oliveira1, L. Fraga1,A.F.M.daCosta4,J.E.S.Costa4,B.G.Castanheira4, O. Giovannini7,R.E.Nather3, A. Mukadam3, S. D. Kawaler8, M. S. O’Brien8,M.D.Reed8,9,S.J.Kleinman2,J.L.Provencal10,T.K.Watson11,D.Kilkenny12, D. J. Sullivan13, T. Sullivan13, B. Shobbrook14,X.J.Jiang15, B. N. Ashoka16,S.Seetha16, E. Leibowitz17, P. Ibbetson17, H. Mendelson17,E.G.Meištas18,R.Kalytis18, D. Ališauskas19, D. O’Donoghue12, D. Buckley12, P. Martinez12,F.vanWyk12,R.Stobie12, F. Marang12,L.vanZyl12,W.Ogloza20, J. Krzesinski20,S.Zola20,21, P. Moskalik22,M.Breger23,A.Stankov23, R. Silvotti24,A.Piccioni25, G. Vauclair26,N.Dolez26, M. Chevreton27, J. Deetjen28, S. Dreizler28,29,S.Schuh28,29, J. M. Gonzalez Perez30, R. Østensen31, A. Ulla32, M. Manteiga32, O. Suarez32,M.R.Burleigh33, and M. A. Barstow33 Received 20 April 2004 / Accepted 31 October 2004 Abstract. BPM 37093 is the only hydrogen-atmosphere white dwarf currently known which has sufficient mass (∼1.1 M)to theoretically crystallize while still inside the ZZ Ceti instability strip (Teff ∼ 12 000 K). As a consequence, this star represents our first opportunity to test crystallization theory directly. If the core is substantially crystallized, then the inner boundary for each pulsation mode will be located at the top of the solid core rather than at the center of the star, affecting mainly the average period spacing.
    [Show full text]
  • Dazzling Desire
    VISITOR GUIDE DAZZLING 18/10/2017 14/01/2018 DESIRE Diamonds and their emotional meaning Please return this visitor guide after your visit. Do you want to read the texts again? You can download them from our website (www.mas.be) or buy the publication in the MASshop. Photo credits 13. / 15. © Antwerp, MAS – 32. © Chantilly, Musée Condé – 53. © Vienna, Museum für Völker- kunde (Foto-archiv nr.5125) – 54. © St-Petersburg, Russisch Etnografisch Museum (nr. 850-139) – 56. © Collection Staf Daems – 71. Private collection - 103. © Antwerp, Cathedral – Chapel of Our Lady/Brussels, KIK-IRPA, cliché KN008630 – 126. © Lennik, Kasteel van Gaasbeek – 131. © Antwerp, Royal Museum of Fine Arts (560) / Lucas Art in Flanders – 134. © Rotterdam, Museum Boijmans Van Beuningen, foto: Studio Tromp, Rotterdam – 148. © Vienna, Bundesmobilienverwaltung – Hofburg Wien, Sisi-Museum, Photographer: Gerald Schedy – 153. © Brussels, Archives of the Royal Palace – 160. © Victoria, Royal BC Museum and Archives (193501-001) – 161. / 162. © Washington, Library of Congress, Prints & Photographs Division, Edward S. Curtis Collection – 167. © St-Petersburg, The State Hermitage Museum (GE-1352) – 170. © St-Petersburg, The State Hermitage Museum (ERR-1104) – 171. © London, Royal Collection Trust / © Her Majesty Queen Elizabeth II 2017 (RCIN 2153177) – 176. © Geneva, Herbert Horovitz Collection – 179. © Brussels, Chancellery of the prime minister – 184. © bpk – Bildagentur – 185. © Julien Mattia / ZUMA Wire / Alamy Live News – 193. © Tervuren, Royal Museum for Central Afrika, Casimir Zagourski (EP.0.0.3342) – 194. © Washington, Smithsonian Institution, National Museum of African Art (Eliot Elisofon Photographic Archives) – 200. – 204. © Kadir van Lohuizen / NOOR – 205. © Felipe Dana / AP / Isopix – b. / n2. © Antwerp, Hendrik Conscience Heritage Library – c.
    [Show full text]
  • Post-Main-Sequence Planetary System Evolution Rsos.Royalsocietypublishing.Org Dimitri Veras
    Post-main-sequence planetary system evolution rsos.royalsocietypublishing.org Dimitri Veras Department of Physics, University of Warwick, Coventry CV4 7AL, UK Review The fates of planetary systems provide unassailable insights Cite this article: Veras D. 2016 into their formation and represent rich cross-disciplinary Post-main-sequence planetary system dynamical laboratories. Mounting observations of post-main- evolution. R. Soc. open sci. 3: 150571. sequence planetary systems necessitate a complementary level http://dx.doi.org/10.1098/rsos.150571 of theoretical scrutiny. Here, I review the diverse dynamical processes which affect planets, asteroids, comets and pebbles as their parent stars evolve into giant branch, white dwarf and neutron stars. This reference provides a foundation for the Received: 23 October 2015 interpretation and modelling of currently known systems and Accepted: 20 January 2016 upcoming discoveries. 1. Introduction Subject Category: Decades of unsuccessful attempts to find planets around other Astronomy Sun-like stars preceded the unexpected 1992 discovery of planetary bodies orbiting a pulsar [1,2]. The three planets around Subject Areas: the millisecond pulsar PSR B1257+12 were the first confidently extrasolar planets/astrophysics/solar system reported extrasolar planets to withstand enduring scrutiny due to their well-constrained masses and orbits. However, a retrospective Keywords: historical analysis reveals even more surprises. We now know that dynamics, white dwarfs, giant branch stars, the eponymous celestial body that Adriaan van Maanen observed pulsars, asteroids, formation in the late 1910s [3,4]isanisolatedwhitedwarf(WD)witha metal-enriched atmosphere: direct evidence for the accretion of planetary remnants. These pioneering discoveries of planetary material around Author for correspondence: or in post-main-sequence (post-MS) stars, although exciting, Dimitri Veras represented a poor harbinger for how the field of exoplanetary e-mail: [email protected] science has since matured.
    [Show full text]
  • Semi-Supervised Named Entity Recognition: Learning to Recognize 100 Entity Types with Little Supervision
    Semi-Supervised Named Entity Recognition: Learning to Recognize 100 Entity Types with Little Supervision David Nadeau Thesis submitted to the Faculty of Graduate and Postdoctoral Studies in partial fulfillment of the requirements for the PhD degree in Computer Science Ottawa-Carleton Institute for Computer Science School of Information Technology and Engineering University of Ottawa © David Nadeau, Ottawa, Canada, 2007 ii Table of contents List of tables ........................................................................................................................ iv List of figures ....................................................................................................................... v Abstract ............................................................................................................................... vi Acknowledgements ........................................................................................................... vii 1 Introduction ...................................................................................................................... 1 2 Background and Related Work ...................................................................................... 6 2.1 Related Work ............................................................................................................. 7 2.2 Applications ............................................................................................................... 9 2.3 Observations: 1991 to 2006 ...................................................................................
    [Show full text]
  • Arxiv:0709.4613V2 [Astro-Ph] 16 Apr 2008 .Quirrenbach A
    Astronomy and Astrophysics Review manuscript No. (will be inserted by the editor) M. S. Cunha · C. Aerts · J. Christensen-Dalsgaard · A. Baglin · L. Bigot · T. M. Brown · C. Catala · O. L. Creevey · A. Domiciano de Souza · P. Eggenberger · P. J. V. Garcia · F. Grundahl · P. Kervella · D. W. Kurtz · P. Mathias · A. Miglio · M. J. P. F. G. Monteiro · G. Perrin · F. P. Pijpers · D. Pourbaix · A. Quirrenbach · K. Rousselet-Perraut · T. C. Teixeira · F. Th´evenin · M. J. Thompson Asteroseismology and interferometry Received: date M. S. Cunha and T. C. Teixeira Centro de Astrof´ısica da Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal. E-mail: [email protected] C. Aerts Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium; Afdeling Sterrenkunde, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands. J. Christensen-Dalsgaard and F. Grundahl Institut for Fysik og Astronomi, Aarhus Universitet, Aarhus, Denmark. A. Baglin and C. Catala and P. Kervella and G. Perrin LESIA, UMR CNRS 8109, Observatoire de Paris, France. L. Bigot and F. Th´evenin Observatoire de la Cˆote d’Azur, UMR 6202, BP 4229, F-06304, Nice Cedex 4, France. T. M. Brown Las Cumbres Observatory Inc., Goleta, CA 93117, USA. arXiv:0709.4613v2 [astro-ph] 16 Apr 2008 O. L. Creevey High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80301, USA; Instituto de Astrofsica de Canarias, Tenerife, E-38200, Spain. A. Domiciano de Souza Max-Planck-Institut f¨ur Radioastronomie, Auf dem H¨ugel 69, 53121 Bonn, Ger- many. P. Eggenberger Observatoire de Gen`eve, 51 chemin des Maillettes, 1290 Sauverny, Switzerland; In- stitut d’Astrophysique et de G´eophysique de l’Universit´e de Li`ege All´ee du 6 Aoˆut, 17 B-4000 Li`ege, Belgium.
    [Show full text]
  • From a Scientific Viewpoint, White Dwarf Stars Prove to Be One of the Most Useful Objects in Our Galaxy for Astronomical Research
    A.J. Salois 1 Crystallizaon of Pulsang White Dwarf Stars From a scientific viewpoint, White Dwarf Stars prove to be one of the most useful objects in our galaxy for astronomical research. Many different projects can be performed on these dim stars, ranging from understanding dark matter to finding solar systems similar to our own. By understanding how these stars are crystallizing, we gain a better understanding of extreme physics. When we better understand extreme physics we will be more equipped to provide our world with clean energy that comes about by the use of such physics. First, we must concentrate on something that we can relate to ourselves and proceed by applying it to these stars. Seismology on the Earth has helped us to understand many different things about our world and how it works. By using these waves we can determine many different things about the Earth, specifically its inner make-up. By looking at white dwarf stars that are pulsating we can use similar methods to understand their inner workings. The star, BPM 37093, is believed to be the first pulsating white dwarf star in which the interior is crystallized, as shown in Winget (1997). This makes it an extremely interesting star to study using asteroseismology, which looks at the pulsations of the star to determine information about it. By using data taken on the 0.9m telescope at CTIO in Chile, I was able to obtain a light curve. After measuring the brightness of the target star, one can see that the brightness of the star will change, creating a complicated light curve that shows the pulsations of the star.
    [Show full text]
  • Effects of Rotation Arund the Axis on the Stars, Galaxy and Rotation of Universe* Weitter Duckss1
    Effects of Rotation Arund the Axis on the Stars, Galaxy and Rotation of Universe* Weitter Duckss1 1Independent Researcher, Zadar, Croatia *Project: https://www.svemir-ipaksevrti.com/Universe-and-rotation.html; (https://www.svemir-ipaksevrti.com/) Abstract: The article analyzes the blueshift of the objects, through realized measurements of galaxies, mergers and collisions of galaxies and clusters of galaxies and measurements of different galactic speeds, where the closer galaxies move faster than the significantly more distant ones. The clusters of galaxies are analyzed through their non-zero value rotations and gravitational connection of objects inside a cluster, supercluster or a group of galaxies. The constant growth of objects and systems is visible through the constant influx of space material to Earth and other objects inside our system, through percussive craters, scattered around the system, collisions and mergers of objects, galaxies and clusters of galaxies. Atom and its formation, joining into pairs, growth and disintegration are analyzed through atoms of the same values of structure, different aggregate states and contiguous atoms of different aggregate states. The disintegration of complex atoms is followed with the temperature increase above the boiling point of atoms and compounds. The effects of rotation around an axis are analyzed from the small objects through stars, galaxies, superclusters and to the rotation of Universe. The objects' speeds of rotation and their effects are analyzed through the formation and appearance of a system (the formation of orbits, the asteroid belt, gas disk, the appearance of galaxies), its influence on temperature, surface gravity, the force of a magnetic field, the size of a radius.
    [Show full text]
  • May 2018 BRAS Newsletter
    Monthly Meeting Monday, May 14th at 7PM at HRPO (Monthly meetings are on 2nd Mondays, Highland Road Park Observatory). Presenter: James Gutierrez and the topic will be ‘A Star is Born’. What's In This Issue? President’s Message Secretary's Summary Outreach Report Astrophotography Group Light Pollution Committee Report Recent Forum Entries 20/20 Vision Campaign Members’ Corner – Space Hipsters 2018 Outing Messages from the HRPO Friday Night Lecture Series NASA Events Globe at Night American Radio Relay League Field Day Observing Notes – Centaurus – The Centaur & Mythology Like this newsletter? See PAST ISSUES online back to 2009 Visit us on Facebook – Baton Rouge Astronomical Society Newsletter of the Baton Rouge Astronomical Society May 2018 © 2018 President’s Message We are well into spring now, most of the weekends in April have been cloud out for skywatchers. We had an excellent showing for International Astronomy Day and were able to show the public views of the Sun with a sunspot. The sunspot was some welcome lagniappe given the fact that the Sun is moving towards solar minimum and there have been fewer sunspots this year. BRAS has been given 160 member pins. All members are asked to come to HRPO to receive and sign for their pin. Each member gets one pin for free. Pick yours up this May 14th, 7 pm, HRPO, or at any monthly meeting. Mars is now (May 1, 2018) at an apparent magnitude of -0.37 and will brighten to an apparent magnitude of - 2.79 on July 26, 2018, the date of the 2018 Great Martian Opposition.
    [Show full text]
  • Bpm 37093: the Way to the Interior of Crystallized Stars
    Baltic Astronomy, vol. 7, 183-196, 1998. BPM 37093: THE WAY TO THE INTERIOR OF CRYSTALLIZED STARS A.Kanaan1'2, S.O.Kepler2, O.Giovannini2·3, D.E.Winget4, M. Montgomery4 and A. Nitta4 1 Departamento de Matemätica, Universidade Federal de Santa Maria, Cidade Universitdria, Camobi 97119-900, Santa Maria - RS, Brazil 2 Instituto de Fisica, Universidade Federal do Rio Grande do Sul, 91501-970, Porto Alegre - RS, Brazil 3 Department of Physics and Space Sciences, Florida Institute of Technology, Melbourne, FL 32901, U.S.A. 4 Astronomy Department, University of Texas at Austin, Austin, TX 78712, U.S.A. Received January 27, 1998. Abstract. BPM 37093 is a ZZ Ceti type star of the mass ~ 1.1 MQ. Its temperature 11 000 K) and high mass imply that it should be crystallized throughout most of its core, the exact fraction depend- ing on the core composition. BPM 37093 is the first object where the results of crystallization theory can be probed observationally. If the star is crystallized, its pulsation spectrum should differ signifi- cantly from non-crystallized pulsating stars. Very high signal-to-noise high speed photometry will enable us to detect very low amplitude (<lmmag) modes. The finding of additional pulsation modes will enable us to better disentangle competing physical processes such as the surface layer masses from the effects of crystallization itself. In this paper we report the observations of BPM 37093 from 1991 till 1997 and present the plan for WET observations in 1998. Key words: stars: white dwarfs, variables, crystallization, individual: BPM 37093 184 Α.
    [Show full text]
  • Evaluation Projects for Pulsating Stars Jørgen Christensen-Dalsgaard (29 February, 2016)
    Evaluation projects for Pulsating Stars Jørgen Christensen-Dalsgaard (29 February, 2016) The projects should result in a report of up to around 10 pages, which may be written in Danish or English. Here I expect a description of the general problem considered, and an analysis starting from the references provided, but, as required, taken into account also other references or material. It may be appropriate to present derivations in more detail than provided in the papers. The required papers can in most cases be found through the reprint server ADS, at http://adsabs.harvard.edu/abstract service.html. Also, they are often available as preprints at the arXiv preprint server, at http://xxx.lanl.gov/archive/astro-ph. In some cases, refer- ences are given to papers that may be difficult to find; in that case, I shall lend them to you to copy. A few projects also involve simple numerical analyses or calculations; they can be carried out in any language, but I expect the report to include relevant plots of the results. There should be enough suggestions that you can each get your own project. They will be distributed on a first-come first-served basis. When you have chosen a project I ask you to send me an e-mail ([email protected]) with your name, study number (˚arskortnummer) and the number of the project. I shall keep a list of the project numbers that have already been reserved on the home page of the course. The report should similarly be e-mailed to me, as a PDF file.
    [Show full text]
  • Arxiv:1907.00115V1 [Astro-Ph.SR] 28 Jun 2019
    Noname manuscript No. (will be inserted by the editor) Pulsating white dwarfs: new insights Alejandro H. C´orsico, Leandro G. Althaus, Marcelo M. Miller Bertolami, S. O. Kepler Received: July 2, 2019/ Accepted: July 2, 2019 Abstract Stars are extremely important astronomical objects that constitute the pillars on which the Universe is built, and as such, their study has gained increasing interest over the years. White dwarf stars are not the exception. Indeed, these stars constitute the final evolutionary stage for more than 95 per cent of all stars. The Galactic population of white dwarfs conveys a wealth of information about several fundamental issues and are of vital importance to study the structure, evolution and chemical enrichment of our Galaxy and its components — including the star formation history of the Milky Way. Several important studies have emphasized the advantage of using white dwarfs as reliable clocks to date a variety of stellar populations in the solar neighborhood and in the nearest stellar clusters, including the thin and thick disks, the Galactic spheroid and the system of globular and open clusters. In addition, white dwarfs are tracers of the evolution of planetary systems along several phases of stellar evolution. Not less relevant than these applications, the study of matter at high densities has benefited from our detailed knowledge about evolutionary and observational properties of white dwarfs. In this sense, white dwarfs are used as laboratories for astro-particle physics, being their interest focused on physics beyond the standard model, that is, neutrino physics, axion physics and also radiation from “extra dimensions”, and even crystallization.
    [Show full text]
  • Fy05 Accomplishments and Fy06 Plans Helmut A. Abt
    Appendix A NOAO SCIENTIFIC STAFF: FY05 ACCOMPLISHMENTS AND FY06 PLANS ¬New appointment in FY05 S Non-NSF (external) funding ±Term ended in FY05 HELMUT A. ABT, Emeritus Astronomer Research Interests Evolutionary stellar problems, stellar characteristics, publication studies FY05 Accomplishments Abt and C. Boonyarak (U. Thailand) studied rotation velocities of stars in binaries. It was known that those with periods shorter than several days all have synchronized rotational and orbital motions. They found that binaries with periods up to 500 days have reduced rotational velocities due to tidal interactions. Abt found that the eccentricities in binaries vary from zero in close binaries to an average of 0.5 in binaries with periods greater than 1000 days. In the initial formation of binaries, all eccentricities are equally probable. FY06 Plans Abt is trying to understand the hot inner disks that occur around, at any one time, one-quarter of the rapidly- rotating A dwarfs. These disks have no connection with the outer cool dust disks found around many stars like Vega and beta Pictoris. These disks come and go on time scales of decades. Such stars do not occur in the low-density Local Interstellar Bubble, so they are material accreted from the interstellar medium. Theoretical aspects of the physical processes is being done with M. Marlborough (U. Western Ontario). TAFT E. ARMANDROFF, Astronomer (Director, NOAO Gemini Science Center) Research Interests Stellar populations in the Galaxy and nearby galaxies; dwarf spheroidal galaxies; globular clusters FY05 Accomplishments Armandroff has been studying the dwarf spheroidal satellite galaxies of M31 in collaboration with Da Costa (RSAA/ANU), Pritzl (Macalester), and Jacoby (WIYN).
    [Show full text]