In This Issue: There Will Be Several Tables Set up in OMSI's Auditorium with Members 1
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Explore the Universe Observing Certificate Second Edition
RASC Observing Committee Explore the Universe Observing Certificate Second Edition Explore the Universe Observing Certificate Welcome to the Explore the Universe Observing Certificate Program. This program is designed to provide the observer with a well-rounded introduction to the night sky visible from North America. Using this observing program is an excellent way to gain knowledge and experience in astronomy. Experienced observers find that a planned observing session results in a more satisfying and interesting experience. This program will help introduce you to amateur astronomy and prepare you for other more challenging certificate programs such as the Messier and Finest NGC. The program covers the full range of astronomical objects. Here is a summary: Observing Objective Requirement Available Constellations and Bright Stars 12 24 The Moon 16 32 Solar System 5 10 Deep Sky Objects 12 24 Double Stars 10 20 Total 55 110 In each category a choice of objects is provided so that you can begin the certificate at any time of the year. In order to receive your certificate you need to observe a total of 55 of the 110 objects available. Here is a summary of some of the abbreviations used in this program Instrument V – Visual (unaided eye) B – Binocular T – Telescope V/B - Visual/Binocular B/T - Binocular/Telescope Season Season when the object can be best seen in the evening sky between dusk. and midnight. Objects may also be seen in other seasons. Description Brief description of the target object, its common name and other details. Cons Constellation where object can be found (if applicable) BOG Ref Refers to corresponding references in the RASC’s The Beginner’s Observing Guide highlighting this object. -
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. -
Guide Du Ciel Profond
Guide du ciel profond Olivier PETIT 8 mai 2004 2 Introduction hjjdfhgf ghjfghfd fg hdfjgdf gfdhfdk dfkgfd fghfkg fdkg fhdkg fkg kfghfhk Table des mati`eres I Objets par constellation 21 1 Androm`ede (And) Andromeda 23 1.1 Messier 31 (La grande Galaxie d'Androm`ede) . 25 1.2 Messier 32 . 27 1.3 Messier 110 . 29 1.4 NGC 404 . 31 1.5 NGC 752 . 33 1.6 NGC 891 . 35 1.7 NGC 7640 . 37 1.8 NGC 7662 (La boule de neige bleue) . 39 2 La Machine pneumatique (Ant) Antlia 41 2.1 NGC 2997 . 43 3 le Verseau (Aqr) Aquarius 45 3.1 Messier 2 . 47 3.2 Messier 72 . 49 3.3 Messier 73 . 51 3.4 NGC 7009 (La n¶ebuleuse Saturne) . 53 3.5 NGC 7293 (La n¶ebuleuse de l'h¶elice) . 56 3.6 NGC 7492 . 58 3.7 NGC 7606 . 60 3.8 Cederblad 211 (N¶ebuleuse de R Aquarii) . 62 4 l'Aigle (Aql) Aquila 63 4.1 NGC 6709 . 65 4.2 NGC 6741 . 67 4.3 NGC 6751 (La n¶ebuleuse de l’œil flou) . 69 4.4 NGC 6760 . 71 4.5 NGC 6781 (Le nid de l'Aigle ) . 73 TABLE DES MATIERES` 5 4.6 NGC 6790 . 75 4.7 NGC 6804 . 77 4.8 Barnard 142-143 (La tani`ere noire) . 79 5 le B¶elier (Ari) Aries 81 5.1 NGC 772 . 83 6 le Cocher (Aur) Auriga 85 6.1 Messier 36 . 87 6.2 Messier 37 . 89 6.3 Messier 38 . -
A Photometric Study of Be Stars Located in the Seismology fields of COROT
A&A 476, 927–933 (2007) Astronomy DOI: 10.1051/0004-6361:20078252 & c ESO 2007 Astrophysics A photometric study of Be stars located in the seismology fields of COROT J. Gutiérrez-Soto1,2,J.Fabregat1,2,J.Suso3, M. Lanzara3, R. Garrido4, A.-M. Hubert2, and M. Floquet2 1 Observatorio Astronómico, Universidad de Valencia, edificio Institutos de Investigación, polígono la Coma, 46980 Paterna, Valencia, Spain e-mail: [email protected] 2 GEPI, Observatoire de Paris, CNRS, Université Paris Diderot; place Jules Janssen 92195 Meudon Cedex, France 3 GACE-ICMUV, edificio Institutos de Investigación, polígono la Coma, 46980 Paterna, Valencia, Spain 4 Instituto de Astrofísica de Andalucía (CSIC), calle Camino Bajo de Huétor, 24. 18008, Granada, Spain Received 10 July 2007 / Accepted 28 September 2007 ABSTRACT Context. In preparation for the COROT mission, an exhaustive photometric study of Be stars located in the seismology fields of the mission has been performed. The very precise and long-time-spanned photometric observations gathered by the COROT satellite will give important clues on the origin of the Be phenomenon. Aims. The aim of this work is to find short-period variable Be stars located in the seismology fields of COROT, and to study and characterise their pulsational properties. Methods. Light curves obtained at the Observatorio de Sierra Nevada, together with data from Hipparcos and ASAS-3 for a total of 84 Be stars, were analysed in order to search for short-term variations. We applied standard Fourier techniques and non-linear least-square fitting to the time series. Results. We found 7 multiperiodic, 21 mono-periodic and 26 non-variable Be stars. -
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. -
Measuring the Stellar Accretion Rates of Herbig Ae/Be Stars Brian Donehew Clemson University
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Clemson University: TigerPrints Clemson University TigerPrints Publications Physics and Astronomy 1-1-2012 Measuring the Stellar Accretion Rates of Herbig Ae/Be Stars Brian Donehew Clemson University Sean D. Brittain Clemson University, [email protected] Follow this and additional works at: https://tigerprints.clemson.edu/physastro_pubs Part of the Astrophysics and Astronomy Commons Recommended Citation Please use publisher's recommended citation. This Article is brought to you for free and open access by the Physics and Astronomy at TigerPrints. It has been accepted for inclusion in Publications by an authorized administrator of TigerPrints. For more information, please contact [email protected]. The Astronomical Journal, 141:46 (10pp), 2011 February doi:10.1088/0004-6256/141/2/46 C 2011. The American Astronomical Society. All rights reserved. Printed in the U.S.A. MEASURING THE STELLAR ACCRETION RATES OF HERBIG Ae/Be STARS Brian Donehew1 and Sean Brittain1 Department of Physics and Astronomy, Clemson University, Clemson, SC 29634-0978, USA; [email protected], [email protected] Received 2010 April 10; accepted 2010 November 10; published 2011 January 12 ABSTRACT The accretion rate of young stars is a fundamental characteristic of these systems. While accretion onto T Tauri stars has been studied extensively, little work has been done on measuring the accretion rate of their intermediate-mass analogs, the Herbig Ae/Be stars. Measuring the stellar accretion rate of Herbig Ae/Bes is not straightforward both because of the dearth of metal absorption lines available for veiling measurements and the intrinsic brightness of Herbig Ae/Be stars at ultraviolet wavelengths where the brightness of the accretion shock peaks. -
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). -
Virgo the Virgin
Virgo the Virgin Virgo is one of the constellations of the zodiac, the group tion Virgo itself. There is also the connection here with of 12 constellations that lies on the ecliptic plane defined “The Scales of Justice” and the sign Libra which lies next by the planets orbital orientation around the Sun. Virgo is to Virgo in the Zodiac. The study of astronomy had a one of the original 48 constellations charted by Ptolemy. practical “time keeping” aspect in the cultures of ancient It is the largest constellation of the Zodiac and the sec- history and as the stars of Virgo appeared before sunrise ond - largest constellation after Hydra. Virgo is bordered by late in the northern summer, many cultures linked this the constellations of Bootes, Coma Berenices, Leo, Crater, asterism with crops, harvest and fecundity. Corvus, Hydra, Libra and Serpens Caput. The constella- tion of Virgo is highly populated with galaxies and there Virgo is usually depicted with angel - like wings, with an are several galaxy clusters located within its boundaries, ear of wheat in her left hand, marked by the bright star each of which is home to hundreds or even thousands of Spica, which is Latin for “ear of grain”, and a tall blade of galaxies. The accepted abbreviation when enumerating grass, or a palm frond, in her right hand. Spica will be objects within the constellation is Vir, the genitive form is important for us in navigating Virgo in the modern night Virginis and meteor showers that appear to originate from sky. Spica was most likely the star that helped the Greek Virgo are called Virginids. -
Sky Notes by Neil Bone 2007 June & July
Sky notes by Neil Bone 2007 June & July before sunrise, appearing against the stars of At magnitude –2.5, Jupiter is the brightest Sun and Moon western Gemini. object apart from the Moon in the summer Venus continues its very prominent show- midnight sky. Telescopically, it shows a flat- The Sun reaches its most northerly ing as ‘evening star’, reaching greatest elonga- tened disk with an equatorial diameter of position on the ecliptic on June 2, the date tion 45° west of the Sun on June 9. Around 45 arcseconds – sufficiently large that in- of the Summer Solstice. For a few days this date, Venus will show a half-phase (like struments as small as 60mm aperture will around this time the Sun rises as far north that of the first quarter Moon) in small tel- show some detail in the planet’s cloudy of east and sets as far north of west as it escopes. Half-phase – dichotomy – is nor- atmosphere. The dominant features are dark can, and the hours of daylight are at a mally reached a little before the date of great- belts and lighter zones and spots. The Great maximum for the year for observers at the est evening elongation, an anomaly known as Red Spot and its recently-evolved ‘Red latitudes of the British Isles. Even at the Schröter Effect. Around the time of great- Junior’ counterpart continue to attract much midnight, the Sun is never far below the est elongation, Venus sets three hours after observer attention. horizon at UK latitudes: from the the Sun. -
Celestial Home of Stars Magda Streicher [email protected]
deep-sky delights Celestial Home of Stars Magda Streicher [email protected] In an�quity the Capricornus constella- �on was seen as a monster with the head and forelegs of a goat and the posterior of a fish. The creature could almost be compared to the so-called Mermaid but Image source: Stellarium.org could also some�mes, in the case of Cap- ricornus, refer to the Fishman. served towards the east it indicates the The name ‘Tropic of Capricornus’ origi- point of the winter sols�ce, this sols�ce nates from the fact that when first ob- at present being 33o to the west in the figure of Sagi�arius. The constella�on is special to the au- thor for two good reasons. Not only does she live right inside the old Tropic of Capricorn Circle, but the image also reflects a par�cular shape: it looks very much like a huge lopsided triangle, and special in the star composi�on. Heaven alone knows how anyone could see a sea goat with horns in that par�cular star pa�ern, but be that as it may … We will carefully unravel the constella�on, which holds a large number of bright stars to pleasure the eye. The constella�on occupies 414 square degrees of sky and is situated just east of Sagi�arius, but sadly it is not rich in Monument marking the tropic of Capricorn deep-sky objects. S�ll, it is an easily outside Polokwane, Limpopo province. recognisable compila�on, with several mnassa vol 72 nos 5 & 6 126 127 june 2013 capricornus: celestial home of stars look-alike double stars and is, famously, The lovely double star, alpha Capri- a close neighbour to the centre of the corni, also the star closest to the Sagit- Milky Way. -
Jrasc-August'99 Text
Publications and Products of August/août 1999 Volume/volume 93 Number/numero 4 [678] The Royal Astronomical Society of Canada Observer’s Calendar — 2000 This calendar was created by members of the RASC. All photographs were taken by amateur astronomers using ordinary camera lenses and small telescopes and represent a wide spectrum of objects. An informative caption accompanies every photograph. This year all of the photos are in full colour. The Journal of the Royal Astronomical Society of Canada Le Journal de la Société royale d’astronomie du Canada It is designed with the observer in mind and contains comprehensive astronomical data such as daily Moon rise and set times, significant lunar and planetary conjunctions, eclipses, and meteor showers. The 1999 edition received two awards from the Ontario Printing and Imaging Association, Best Calendar and the Award of Excellence. (designed and produced by Rajiv Gupta). Price: $13.95 (members); $15.95 (non-members) (includes taxes, postage and handling) The Beginner’s Observing Guide This guide is for anyone with little or no experience in observing the night sky. Large, easy to read star maps are provided to acquaint the reader with the constellations and bright stars. Basic information on observing the moon, planets and eclipses through the year 2005 is provided. There is also a special section to help Scouts, Cubs, Guides and Brownies achieve their respective astronomy badges. Written by Leo Enright (160 pages of information in a soft-cover book with otabinding which allows the book to lie flat). Price: $15 (includes taxes, postage and handling) Looking Up: A History of the Royal Astronomical Society of Canada Published to commemorate the 125th anniversary of the first meeting of the Toronto Astronomical Club, “Looking Up — A History of the RASC” is an excellent overall history of Canada’s national astronomy organization. -
Chemical Characterisation of the Globular Cluster NGC 5634 Associated to the Sagittarius Dwarf Spheroidal Galaxy?,?? E
A&A 600, A118 (2017) Astronomy DOI: 10.1051/0004-6361/201630004 & c ESO 2017 Astrophysics Chemical characterisation of the globular cluster NGC 5634 associated to the Sagittarius dwarf spheroidal galaxy?,?? E. Carretta1, A. Bragaglia1, S. Lucatello2, V. D’Orazi2; 3; 4, R. G. Gratton2, P. Donati1; 5, A. Sollima1, and C. Sneden6 1 INAF–Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy e-mail: [email protected] 2 INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy 3 Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia 4 Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, Melbourne, VIC 3800, Australia 5 Dipartimento di Fisica e Astronomia, Università di Bologna, viale Berti Pichat 6, 40127 Bologna, Italy 6 Department of Astronomy and McDonald Observatory, The University of Texas, Austin, TX 78712, USA Received 3 November 2016 / Accepted 4 January 2017 ABSTRACT As part of our on-going project on the homogeneous chemical characterisation of multiple stellar populations in globular clusters (GCs), we studied NGC 5634, associated to the Sagittarius dwarf spheroidal galaxy, using high-resolution spectroscopy of red giant stars collected with VLT/FLAMES. We present here the radial velocity distribution of the 45 observed stars, 43 of which are cluster members, the detailed chemical abundance of 22 species for the seven stars observed with UVES-FLAMES, and the abundance of six elements for stars observed with GIRAFFE. On our homogeneous UVES metallicity scale, we derived a low-metallicity [Fe/H] = −1:867 ± 0:019 ± 0:065 dex (±statistical ±systematic error) with σ = 0:050 dex (7 stars).