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Annual Report 2008
Koninklijke Sterrenwacht van België Observatoire royal de Belgique Royal Observatory of Belgium Mensen voor Aarde en Ruimte , Aarde en Ruimte voor Mensen Des hommes et des femmes pour la Terre et l'Espace, La Terre et l'Espace pour l'Homme Jaarverslag 2008 Rapport Annuel 2008 Annual Report 2008 De activiteiten beschreven in dit verslag werden ondersteund door Les activités décrites dans ce rapport ont été soutenues par The activities described in this report were supported by De POD Wetenschapsbeleid / Le SPP Politique Scientifique De Nationale Loterij La Loterie Nationale De Europese Gemeenschap Het Europees Ruimtevaartagentschap La Communauté Européenne L’Agence Spatiale Européenne Het Fond voor Wetenschappelijk Onderzoek Le Fonds de la Recherche Scientifique – Vlaanderen Le Fonds pour la formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA) Instituut voor de aanmoediging van innovatie door Wetenschap & Technologie in Vlaanderen Privé-sponsoring door Mr. G. Berthault / Sponsoring privé par M. G. Berthault 2 Deel 1: Wetenschappelijke activiteiten Partie 1: Activités Scientifiques Part 1: Scientific Activities 3 4 Summary Abbreviations.................................................................................................................................. 7 A. GNSS Positioning and Time............................................................................................. 14 A.1. Time and Time transfer .............................................................................................................15 -
VSS Newsletter 2018-1 1 from the Director - Mark Blackford Happy New Year to You All, Welcome to 2018
Newsletter 2018-1 January 2018 www.variablestarssouth.org Observations and model light curve of the eclipsing binary V871 Ara. Col Bembrick, Tony Ainsworth and Jeff Byron collaborated on this project in 2001 and have now updated it with a model light curve and new stellar parameters. See their article on page 17 for details. Contents From the director - Mark Blackford ......................................................................................................... 2 2018 RASNZ conference and 5th VSS symposium .............................................................................. 2 Astrometric Positions for SMC Variables – Mati Morel ......................................................................... 3 A look at Mira in 2018 – Stan Walker ..................................................................................................... 8 The DY Per star V487 Vel – Andrew Pearce .........................................................................................11 V382 Carinae - a yellow hypergiant star – Stan Walker ....................................................................... 13 Photometry & initial modelling of the eclipsing binary V871 Ara – C Bembrick, T Ainsworth* & J Byron ...... 17 Changes in the pulsating variables projects - Mira stars with long periods – Stan Walker .................. 23 V0454 Car spectroscopic and photometric campaign – Mark Blackford .............................................. 26 Request for cooperation ...................................................................................................................... -
Variable Star Section Circular
British Astronomical Association Variable Star Section Circular No 77, August 1993 ISSN 0267-9272 Office: Burlington House, Piccadilly, London, W1V 9AG Section Officers Director Tristram Brelstaff, 3 Malvern Court, Addington Road, Reading, Berks, RG1 5PL Tel: 0734-268981 Assistant Director Storm R Dunlop 140 Stocks Lane, East Wittering, Chichester, West Sussex, P020 8NT Tel: 0243-670354 Telex: 9312134138 (SD G) Email: CompuServe:100015,1610 JANET:SDUNLOP@UK. AC. SUSSEX.STARLINK Secretary Melvyn D Taylor, 17 Cross Lane, Wakefield, West Yorks, WF2 8DA Tel: 0924-374651 Chart John Toone, Hillside View, 17 Ashdale Road, Secretary Cressage, Shrewsbury, SY5 6DT Tel: 0952-510794 Nova/Supernova Guy M Hurst, 16 Westminster Close, Kempshott Rise, Secretary Basingstoke, Hants, RG22 4PP Tel & Fax: 0256-471074 Telex: 9312111261 (TA G) Email: Telecom Gold:10074:MIK2885 STARLINK:RLSAC::GMH JANET:GMH0UK. AC. RUTHERFORD.STARLINK. ASTROPHYSICS Pro-Am Liaison Roger D Pickard, 28 Appletons, Hadlow, Kent, TN11 0DT Committee Tel: 0732-850663 Secretary Email: JANET:RDP0UK.AC.UKC.STAR STARLINK:KENVAD: :RDP Computer Dave McAdam, 33 Wrekin View, Madeley, Telford, Secretary Shropshire, TF7 5HZ Tel: 0952-432048 Email: Telecom Gold 10087:YQQ587 Eclipsing Binary Director Secretary Circulars Editor Director Circulars Assistant Director Subscriptions Telephone Alert Numbers Nova and Supernova First phone Nova/Supernova Secretary. If only Discoveries answering machine response then try the following: Denis Buczynski 0524-68530 Glyn Marsh 0772-690502 Martin Mobberley 0245-475297 (weekdays) 0284-828431 (weekends) Variable Star Gary Poyner 021-3504312 Alerts Email: JANET:[email protected] STARLINK:BHVAD::GP For subscription rates and charges for charts and other publications see inside back cover Forthcoming Variable Star Meeting in Cambridge Jonathan Shanklin says that the Cambridge University Astronomical Society is planning a one-day meeting on the subject of variable stars to be held in Cambridge on Saturday, 19th February 1994. -
Ioptron CEM40 Center-Balanced Equatorial Mount
iOptron®CEM40 Center-Balanced Equatorial Mount Instruction Manual Product CEM40 (#7400A series) and CEM40EC (#7400ECA series, as shown) Please read the included CEM40 Quick Setup Guide (QSG) BEFORE taking the mount out of the case! This product is a precision instrument. Please read the included QSG before assembling the mount. Please read the entire Instruction Manual before operating the mount. You must hold the mount firmly when disengaging the gear switches. Otherwise personal injury and/or equipment damage may occur. Any worm system damage due to improper operation will not be covered by iOptron’s limited warranty. If you have any questions please contact us at [email protected] WARNING! NEVER USE A TELESCOPE TO LOOK AT THE SUN WITHOUT A PROPER FILTER! Looking at or near the Sun will cause instant and irreversible damage to your eye. Children should always have adult supervision while using a telescope. 2 Table of Contents Table of Contents ........................................................................................................................................ 3 1. CEM40 Introduction ............................................................................................................................... 5 2. CEM40 Overview ................................................................................................................................... 6 2.1. Parts List ......................................................................................................................................... -
Variable Star
Variable star A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either: Intrinsic variables, whose luminosity actually changes; for example, because the star periodically swells and shrinks. Extrinsic variables, whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth; for example, because the star has an orbiting companion that sometimes Trifid Nebula contains Cepheid variable stars eclipses it. Many, possibly most, stars have at least some variation in luminosity: the energy output of our Sun, for example, varies by about 0.1% over an 11-year solar cycle.[1] Contents Discovery Detecting variability Variable star observations Interpretation of observations Nomenclature Classification Intrinsic variable stars Pulsating variable stars Eruptive variable stars Cataclysmic or explosive variable stars Extrinsic variable stars Rotating variable stars Eclipsing binaries Planetary transits See also References External links Discovery An ancient Egyptian calendar of lucky and unlucky days composed some 3,200 years ago may be the oldest preserved historical document of the discovery of a variable star, the eclipsing binary Algol.[2][3][4] Of the modern astronomers, the first variable star was identified in 1638 when Johannes Holwarda noticed that Omicron Ceti (later named Mira) pulsated in a cycle taking 11 months; the star had previously been described as a nova by David Fabricius in 1596. This discovery, combined with supernovae observed in 1572 and 1604, proved that the starry sky was not eternally invariable as Aristotle and other ancient philosophers had taught. -
Gamma Equulei and Gamma Cygni - SONG Observations
Gamma Equulei and Gamma Cygni - SONG Observations Moletai Summer School 2016-08-07 Zydrune, Tavo, Samuli INTRODUCTION Introduction The project was split into two parts: 1. Analysis of observed data of γ Equulei 2. Identification of another bright star and observations of selected star: γ Cygni Both were observed with SONG telescope. SONG SONG • Stellar Observations Network Group • Launched in 2006 • Fully robotic • Aim: Global network of 8 telescopes assuring continous data collection • Scientific goals of SONG are: - study the internal structure and evolution of stars using asteroseismology - to search for and characterize planets with masses comparable to the Earth in orbit around other stars. Telescope is 1m in diameter • Currently building a telescope in China -> located at the Observatorio testing phase del Teide on Tenerife SONG Lucky Imaging It's a technique to remove the smearing effect the atmosphere causes of stars on images. SONG Spectrograph Separates the light into its different colours allowing us to study them individually which can be used to determine the mass, size and chemical composition of stars. Picture shows the output spectrum from this spectrograph. WEATHER OBSERVATIONS DATA ACQUISITION OBSERVATIONS GAMMA EQUULEI GAMMA EQUULEI - γ Equ is a double star in the northen constellation of Equuleus. - At a distance of around 118 ly - With apparent visual magnitude of 4.7 - Primary component is a chemically peculiar star of A9 type - It undergoes periodic pulsations in luminosity - Surface magnetic field undergoes long term variation with a period of 91.1 ± 3.6 yrs - Variable radial velocity -17km/s - Teff about 8790 (few diff. values) - log.g = 4.49 - Vsini = 10 r - why low vsin i values are good? -> slow rotator GAMMA EQUULEI: Background [ref.1] - γ Equulei is the second brightest roAp star. -
A Roap by Any Other Name Would Cast a Spell As Sweet [PDF]
W. Shakespeare The Globe Theatre Stratford-on-Avon, UK Observations of roAp stars Observations of Vancouver, Canada Vancouver, University of British Columbia British of University Jaymie Matthews Jaymie What’s in a name? What’s would cast a spell as sweet a spell would cast An roAp by any other name An roAp by any other What’s in a name? rapidly oscillating Ap star What’s in a name? rapidly oscillating Ap star “r-o-A-p” abbreviation What’s in a name? rapidly oscillating Ap star “r-o-A-p” abbreviation “rope” acronyms “rho-App” What’s in a name? rapidly oscillating Ap star “r-o-A-p” abbreviation p-mode “rope” acronyms g-modes “rho-App” What’s in a name? rapidly oscillating Ap star “r-o-A-p” abbreviation p-mode “rope” acronyms g-modes “rho-App” “rho-A-p” What’s in a name? rapidly oscillating Ap star “r-o-A-p” abbreviation p-mode “rope” acronyms g-modes “rho-App” “rho-A-p” hybrid What’s in a name? slowly pulsating B star The new class was announced at the 1986 pulsation conference in Los Alamos Christoffel Waelkens hybrid What’s in a name? slowly oscillating B star The new class was announced at the 1986 pulsation conference in Los Alamos but with a different name Christoffel Waelkens hybrid What’s in a name? slowly oscillating B star The new class was announced at the 1986 pulsation conference in Los Alamos but with a different name and this abbreviation Christoffel Waelkens S.O.B. -
CONSTELLATION EQUULEUS the Little Horse Or the Foal Equuleus Is the Head of a Horse with a Flowing Mane Which the Arabs Called A
CONSTELLATION EQUULEUS The Little Horse or The Foal Equuleus is the head of a horse with a flowing mane which the Arabs called Al Faras al Awwal, 'the First Horse', in reference to its rising before Pegasus. Equuleus is the second smallest of the modern constellations (after Crux), spanning only 72 square degrees. It is tucked between the head of Pegasus and the dolphin, Delphinus. It is also very faint, having no stars brighter than the fourth magnitude. Its name is Latin for 'little horse', a foal. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. The actual inventor is unknown; it may have been Ptolemy himself, or one of his predecessors, such as Hipparchus, the Greek astronomer who lived around 190-120 B.C. Hipparchus mapped the position of 850 stars in the earliest known star chart. His observations of the heavens form the basis of Ptolemy's geocentric cosmology. Ptolemy called the constellation Protomé Hippou, the forepart of a horse, perhaps Ptolemy had in mind the story of Hippe and her daughter Melanippe: Hippe, daughter of Chiron the centaur, one day was seduced by Aeolus, grandson of Deucalion. To hide the secret of her pregnancy from Chiron she fled into the mountains, where she gave birth to Melanippe. When her father came looking for her, Hippe appealed to the gods who changed her into a mare. Artemis placed the image of Hippe among the stars, where she still hides from Chiron (represented by the constellation Centaurus), with only her head showing THE STARS Equuleus consists merely of a few stars of fourth magnitude and fainter, forming the head of a horse, next to the head of the much better-known horse Pegasus. -
Ioptron GEM28 German Equatorial Mount
iOptron® GEM28 German Equatorial Mount Instruction Manual Product GEM28 and GEM28EC Read the included Quick Setup Guide (QSG) BEFORE taking the mount out of the case! This product is a precision instrument and uses a magnetic gear meshing mechanism. Please read the included QSG before assembling the mount. Please read the entire Instruction Manual before operating the mount. You must hold the mount firmly when disengaging or adjusting the gear switches. Otherwise personal injury and/or equipment damage may occur. Any worm system damage due to improper gear meshing/slippage will not be covered by iOptron’s limited warranty. If you have any questions please contact us at [email protected] WARNING! NEVER USE A TELESCOPE TO LOOK AT THE SUN WITHOUT A PROPER FILTER! Looking at or near the Sun will cause instant and irreversible damage to your eye. Children should always have adult supervision while observing. 2 Table of Content Table of Content ................................................................................................................................................. 3 1. GEM28 Overview .......................................................................................................................................... 5 2. GEM28 Terms ................................................................................................................................................ 6 2.1. Parts List ................................................................................................................................................. -
Astronomy Magazine 2020 Index
Astronomy Magazine 2020 Index SUBJECT A AAVSO (American Association of Variable Star Observers), Spectroscopic Database (AVSpec), 2:15 Abell 21 (Medusa Nebula), 2:56, 59 Abell 85 (galaxy), 4:11 Abell 2384 (galaxy cluster), 9:12 Abell 3574 (galaxy cluster), 6:73 active galactic nuclei (AGNs). See black holes Aerojet Rocketdyne, 9:7 airglow, 6:73 al-Amal spaceprobe, 11:9 Aldebaran (Alpha Tauri) (star), binocular observation of, 1:62 Alnasl (Gamma Sagittarii) (optical double star), 8:68 Alpha Canum Venaticorum (Cor Caroli) (star), 4:66 Alpha Centauri A (star), 7:34–35 Alpha Centauri B (star), 7:34–35 Alpha Centauri (star system), 7:34 Alpha Orionis. See Betelgeuse (Alpha Orionis) Alpha Scorpii (Antares) (star), 7:68, 10:11 Alpha Tauri (Aldebaran) (star), binocular observation of, 1:62 amateur astronomy AAVSO Spectroscopic Database (AVSpec), 2:15 beginner’s guides, 3:66, 12:58 brown dwarfs discovered by citizen scientists, 12:13 discovery and observation of exoplanets, 6:54–57 mindful observation, 11:14 Planetary Society awards, 5:13 satellite tracking, 2:62 women in astronomy clubs, 8:66, 9:64 Amateur Telescope Makers of Boston (ATMoB), 8:66 American Association of Variable Star Observers (AAVSO), Spectroscopic Database (AVSpec), 2:15 Andromeda Galaxy (M31) binocular observations of, 12:60 consumption of dwarf galaxies, 2:11 images of, 3:72, 6:31 satellite galaxies, 11:62 Antares (Alpha Scorpii) (star), 7:68, 10:11 Antennae galaxies (NGC 4038 and NGC 4039), 3:28 Apollo missions commemorative postage stamps, 11:54–55 extravehicular activity -
Ioptron CEM70 Center-Balanced Equatorial Mount
iOptron® CEM70 Center-Balanced Equatorial Mount Instruction Manual Product CEM70(#C70A), CEM70G(#C70AG) and CEM70EC(#C704A0) Please read the included CEM70 Quick Setup Guide (QSG) BEFORE taking the mount out of the case! This product is a precision instrument. Please read the included QSG before assembling the mount. Please read the entire Instruction Manual before operating the mount. You must hold the mount firmly when disengaging the gear switches. Otherwise personal injury and/or equipment damage may occur. Any worm system damage due to improper operation will not be covered by iOptron’s limited warranty. If you have any questions please contact us at [email protected] WARNING! NEVER USE A TELESCOPE TO LOOK AT THE SUN WITHOUT A PROPER FILTER! Looking at or near the Sun will cause instant and irreversible damage to your eye. Children should always have adult supervision while using a telescope. 2 Table of Contents Table of Contents ........................................................................................................................................ 3 1. CEM70 Introduction ................................................................................................................................ 5 2. CEM70 Terms ......................................................................................................................................... 6 2.1. Parts List ........................................................................................................................................... 6 2.2. -
Instruction Manual
iOptron® GEM28 German Equatorial Mount Instruction Manual Product GEM28 and GEM28EC Read the included Quick Setup Guide (QSG) BEFORE taking the mount out of the case! This product is a precision instrument and uses a magnetic gear meshing mechanism. Please read the included QSG before assembling the mount. Please read the entire Instruction Manual before operating the mount. You must hold the mount firmly when disengaging or adjusting the gear switches. Otherwise personal injury and/or equipment damage may occur. Any worm system damage due to improper gear meshing/slippage will not be covered by iOptron’s limited warranty. If you have any questions please contact us at [email protected] WARNING! NEVER USE A TELESCOPE TO LOOK AT THE SUN WITHOUT A PROPER FILTER! Looking at or near the Sun will cause instant and irreversible damage to your eye. Children should always have adult supervision while observing. 2 Table of Content Table of Content ................................................................................................................................................. 3 1. GEM28 Overview .......................................................................................................................................... 5 2. GEM28 Terms ................................................................................................................................................ 6 2.1. Parts List .................................................................................................................................................