DOCSLIB.ORG

Feb 2016 Newsletter

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

Volume21, Issue 7 NWASNEWS February 2016 Newsletter for the Wiltshire, Swindon, Beckington February, Astro Fest time. Astronomical Societies and Salisbury Plain Observing Group Firstly can I send a thankyou to Peter This Friday and Saturday sees the Astro- Chappell for late arranging and Owen Bra- fest in London at the Kensington Confer- Wiltshire Society Page 2 zell for standing in to give a talk tonight on ence and events centre. Swindon Stargazers 3 galaxy cluster. Owen is well qualified as a The talks are the key to this exhibition as deep sky observer, especially eyeball to Beckington and SPOG 4 the stands tend to be very cramped for eye piece! He has frequently come along space, and many suppliers can no longer to mass observing sessions, and is well Software list: Downloadable 4 afford to rent the space. Even so, they are software and apps. known to several members. across 3 floors and you do need to go One of Owen’s previous visits was at a with an idea of what you want to see and Space Place : Lonely galax- 6 Stargazing live event 3 years ago, but we MUST prebook talks on both days.9’00am ies. were rained of the field but the previous to 6pm, 8 talks each day. year we had a very full day… This year, Space News: 6-17 Some ideas of my favourite purchases Moon haloes, Curiosity thanks to more late coordination from the last year have been two mounts, one, the selfie, Why does the Earth Beeb we made a low key event for the Sky Watcher Star Traveller has been the rotate, Blue origin soft land- 15th, and had clear skies AND the use of tool for astrophotography I have been ing, Opportunity 4 years the Manger Barn at very short notice. chasing for years. Something that is quick into a 40 day mission!, Thank you to the observing team, Nick to set up, gives option for small telescope Space X so near to sea Howes and the National Trust. landing, Does the Moon use with or without camera, and no trail- phase affect the rain?, Un- On Monday May 9th we have the transit of ing leads other than your camera release. derstanding the Magnetic Mercury across the front of the Sun, start- You can even plug in a computer to pro- Sun. ing at 12:12BST and finishing at 19:40 vide a goto facility, but I’ve not tried this BST, about half an hour before sunset. I yet. A good sturdy tripod is needed to Viewing log and images 15-17 am putting this here because the English mount it on. Heritage at Stonehenge have come to me The other mount was an observatory What’s Up February 2016 18-19 and asked if we will put on an event near mount, but other than the astro DSLR the stones, where we will have permission these were my most used and successful Constellation of the Month 20-22 to stay until the end of the eclipse. If we purchases. Gemini can put a team together we can view and image the transit beginning to end as long Good eyepieces will make a big differ- Archeoastronomy Lecture 22 as we also show the public the telescope ence to your viewing experience with any telescope, and there will be plenty on sale Space Station Timings 23 views at the same time. We will need to work at quite high magnification, all cor- at the exhibition. IMAGES, VIEWING SES- 24 rectly shielded, to get a chance of seeing Enjoy... SIONS and OUTREACH Mercury that will be about 6 arc seconds Clear skies across against 33 arc minutes for the solar Andy surface background. The Moon and Jupiter First one taken at 1/250 of a second, this brings Jupiter out a bit but the Moon is over exposed. Both pictures taken with a Canon 60Da DSLR camera attached to a William Optics 80mm refractor at f6.8 on a Porta Mount II. Rare clear sky in Janu- ary! Peter Chappell Ed I have worked on the Jupiter zone only to bring out the planet. I was racing home from giving talks in Wales to capture this, but thin cloud spoilt the view from Chippenham. Andy Page 2 Volume21, Issue2 Wiltshire Society Page Membership Changes in fees to be discussed. Could be lowered! Wiltshire Astronomical Society Meeting nights £1.00 for members £3 for visitors Web site: www.wasnet.org.uk Wiltshire AS Contacts Meetings 2015/2016Season. Andy Burns (Chairman, and Editor ) Tel: 01249 654541, NEW VENUE the Pavilion, Rusty Lane, Seend email: [email protected] Meet 7.30 for 8.00pm start Vice chair: Keith Bruton Bob Johnston (Treasurer) 2016 Philip Proven (Hall coordinator) Feb 2nd Owen Brazell: Galaxy Clusters Peter Chappell (Speaker secretary) Mar1st Life on Mars : Professor Mark Sims Nick Howes (Technical Guru) Apr 5th The Story of Star Names : Mark Hurn Observing Sessions coordinators: Jon Gale, Tony Vale May 3rd Oddities of the Solar System : Bob Mizon Contact via the web site details. This is to protect individuals June 7th The Current State of SETI : Martin Griffiths from unsolicited mailings. Rusty Lane, Pavilion Speaker for February Owen Bra- Observing Sessions zell. Webb society section director. The Wiltshire Astronomical care shown we may get the Owen Brazell, as well as previously Society’s observing sessions National Trust to do some- editing the DSO, is also the assis- are open, and we welcome thing with them! tant director of the British Astro- visitors from other societies nomical Associations Deep Sky as well as members of the PLEASE see our proposed Section and regular contributor to public to join us. changes to the observing Astronomy Now. When observing, We will help you set up sessions, contacting and his primary interests are in the ob- equipment (as often as you other details. Back Page servation of planetary and diffuse need this help), and let you nebulae -- although since the acquisition of a 51cm tele- test anything we have to help scope this has also moved to viewing galaxy clusters. you in your choice of future astronomy purchases. His interest in astronomy was sparked by an attempt to see Please treat the lights and a comet from his native Toronto. From early years, he kept return to full working order up his interest in astronomy which culminated in a degree in before leaving. With enough astronomy from St Andrews University in Scotland and tak- ing though not completing an MSc in Astrophysics. At that time, he also gained an interest in the northern lights. As with many astronomers, finding no living there, he moved into the oil business first in R&D and then as a computer systems designer (this explains his interest in the computer side of astronomy). Despite this he still uses Dobsonian type telescopes ranging from a 4" Genesis-sdf through a 21". The recent plethora of fuzzy objects that move has re- awakened an interest in comets! His searches for dark skies have taken him from the moun- tains of Canada through Texas to the Florida Keys as well as to Wales - the only good dark sky site he has found so far in the UK. Page 3 Meetings for 2016 Swindon’s own astronomy group The club meets once a month at Liddington Hall, Church At Liddington Village Hall, Church Road, Liddington, SN4 0HB – 7pm onwards Road, Liddington, Swindon, SN4 0HB at 7pm. See pro- gramme below. The hall has easy access from Junction 15 of the M4, a map and directions can be found on our website at: A Bad Month For Stargazing http://www.swindonstargazers.com/clubdiary/ It’s been a bad month for stargazing in the evenings; howev- directions01.htm er, the early mornings have been great for viewing the plan- Friday 19 Feb 2016 ets, some of which were on show together. Programme: Andy Burns: A presentation on John Herschel February Meeting Friday 18 Mar 2016 This month we welcome your chairman Andy Burns, who will Programme: AGM plus a presentation be giving a talk on John Herschel. We look forward to this, as it has been some time since Andy has spoken to the club. Friday 15 Apr 2016 Next month is our all important AGM and we are also looking Programme: Mark Radice: Observing the Moon forward to this. Friday 20 May 2016 Ad-hoc viewing sessions near Uffcott Programme: Owen Brazell: Shrouds of Night - Observing Dark Nebulae Regular stargazing evenings are being organised near Swin- don. To join these events please visit our website for further Friday 17 Jun 2016 information. Programme: James Fradgely: How (on Earth) Did Life Start We meet regularly at a lay-by just outside the village of Uff- cott, near Wroughton. Directions are also shown on the Friday 16 Sep 2016 website link below. Programme: Guy Hurst: Star Clusters When we use East Kennett, we meet at the public car park just below The Red Lion pub at Avebury; we usually hang on Friday 21 Oct 2016 for 10 minutes and then move on to our viewing spot at East Programme: Paul Roche: Robotic Astronomy Kennett. Information about our evenings and viewing spots can be found here: Friday 18 Nov 2016 http://www.swindonstargazers.com/noticeboard/ Programme: Mike Leggett: Exploration of Mars noticeboard06.htm Friday 16 Dec 2016 If you think you might be interested email the organiser Rob- in Wilkey (see website). With this you will then be emailed Programme: Christmas Social regarding the event, whether it is going ahead or whether it Website: will be cancelled because of cloud etc.
Recommended publications
  • Binocular Double Star Logbook

    Binocular Double Star Logbook

    Astronomical League Binocular Double Star Club Logbook 1 Table of Contents Alpha Cassiopeiae 3 14 Canis Minoris Sh 251 (Oph) Psi 1 Piscium* F Hydrae Psi 1 & 2 Draconis* 37 Ceti Iota Cancri* 10 Σ2273 (Dra) Phi Cassiopeiae 27 Hydrae 40 & 41 Draconis* 93 (Rho) & 94 Piscium Tau 1 Hydrae 67 Ophiuchi 17 Chi Ceti 35 & 36 (Zeta) Leonis 39 Draconis 56 Andromedae 4 42 Leonis Minoris Epsilon 1 & 2 Lyrae* (U) 14 Arietis Σ1474 (Hya) Zeta 1 & 2 Lyrae* 59 Andromedae Alpha Ursae Majoris 11 Beta Lyrae* 15 Trianguli Delta Leonis Delta 1 & 2 Lyrae 33 Arietis 83 Leonis Theta Serpentis* 18 19 Tauri Tau Leonis 15 Aquilae 21 & 22 Tauri 5 93 Leonis OΣΣ178 (Aql) Eta Tauri 65 Ursae Majoris 28 Aquilae Phi Tauri 67 Ursae Majoris 12 6 (Alpha) & 8 Vul 62 Tauri 12 Comae Berenices Beta Cygni* Kappa 1 & 2 Tauri 17 Comae Berenices Epsilon Sagittae 19 Theta 1 & 2 Tauri 5 (Kappa) & 6 Draconis 54 Sagittarii 57 Persei 6 32 Camelopardalis* 16 Cygni 88 Tauri Σ1740 (Vir) 57 Aquilae Sigma 1 & 2 Tauri 79 (Zeta) & 80 Ursae Maj* 13 15 Sagittae Tau Tauri 70 Virginis Theta Sagittae 62 Eridani Iota Bootis* O1 (30 & 31) Cyg* 20 Beta Camelopardalis Σ1850 (Boo) 29 Cygni 11 & 12 Camelopardalis 7 Alpha Librae* Alpha 1 & 2 Capricorni* Delta Orionis* Delta Bootis* Beta 1 & 2 Capricorni* 42 & 45 Orionis Mu 1 & 2 Bootis* 14 75 Draconis Theta 2 Orionis* Omega 1 & 2 Scorpii Rho Capricorni Gamma Leporis* Kappa Herculis Omicron Capricorni 21 35 Camelopardalis ?? Nu Scorpii S 752 (Delphinus) 5 Lyncis 8 Nu 1 & 2 Coronae Borealis 48 Cygni Nu Geminorum Rho Ophiuchi 61 Cygni* 20 Geminorum 16 & 17 Draconis* 15 5 (Gamma) & 6 Equulei Zeta Geminorum 36 & 37 Herculis 79 Cygni h 3945 (CMa) Mu 1 & 2 Scorpii Mu Cygni 22 19 Lyncis* Zeta 1 & 2 Scorpii Epsilon Pegasi* Eta Canis Majoris 9 Σ133 (Her) Pi 1 & 2 Pegasi Δ 47 (CMa) 36 Ophiuchi* 33 Pegasi 64 & 65 Geminorum Nu 1 & 2 Draconis* 16 35 Pegasi Knt 4 (Pup) 53 Ophiuchi Delta Cephei* (U) The 28 stars with asterisks are also required for the regular AL Double Star Club.
  • The Observer's Handbook for 1915

    The Observer's Handbook for 1915

    T he O b s e r v e r ’s H a n d b o o k FOR 1915 PUBLISHED BY The Royal Astronomical Society Of Canada E d i t e d b y C . A. CHANT SEVENTH YEAR OF PUBLICATION TORONTO 198 C o l l e g e S t r e e t Pr in t e d f o r t h e S o c ie t y CALENDAR 1915 T he O bserver' s H andbook FOR 1915 PUBLISHED BY The Royal Astronomical Society Of Canada E d i t e d b y C. A. CHANT SEVENTH YEAR OF PUBLICATION TORONTO 198 C o l l e g e S t r e e t Pr in t e d f o r t h e S o c ie t y 1915 CONTENTS Preface - - - - - - 3 Anniversaries and Festivals - - - - - 3 Symbols and Abbreviations - - - - -4 Solar and Sidereal Time - - - - 5 Ephemeris of the Sun - - - - 6 Occultation of Fixed Stars by the Moon - - 8 Times of Sunrise and Sunset - - - - 8 The Sky and Astronomical Phenomena for each Month - 22 Eclipses, etc., of Jupiter’s Satellites - - - - 46 Ephemeris for Physical Observations of the Sun - - 48 Meteors and Shooting Stars - - - - - 50 Elements of the Solar System - - - - 51 Satellites of the Solar System - - - - 52 Eclipses of Sun and Moon in 1915 - - - - 53 List of Double Stars - - - - - 53 List of Variable Stars- - - - - - 55 The Stars, their Magnitude, Velocity, etc. - - - 56 The Constellations - - - - - - 64 Comets of 1914 - - - - - 76 PREFACE The H a n d b o o k for 1915 differs from that for last year chiefly in the omission of the brief review of astronomical pro­ gress, and the addition of (1) a table of double stars, (2) a table of variable stars, and (3) a table containing 272 stars and 5 nebulae.
  • Downloads/ Astero2007.Pdf) and by Aerts Et Al (2010)

    Downloads/ Astero2007.Pdf) and by Aerts Et Al (2010)

    This work is protected by copyright and other intellectual property rights and duplication or sale of all or part is not permitted, except that material may be duplicated by you for research, private study, criticism/review or educational purposes. Electronic or print copies are for your own personal, non- commercial use and shall not be passed to any other individual. No quotation may be published without proper acknowledgement. For any other use, or to quote extensively from the work, permission must be obtained from the copyright holder/s. i Fundamental Properties of Solar-Type Eclipsing Binary Stars, and Kinematic Biases of Exoplanet Host Stars Richard J. Hutcheon Submitted in accordance with the requirements for the degree of Doctor of Philosophy. Research Institute: School of Environmental and Physical Sciences and Applied Mathematics. University of Keele June 2015 ii iii Abstract This thesis is in three parts: 1) a kinematical study of exoplanet host stars, 2) a study of the detached eclipsing binary V1094 Tau and 3) and observations of other eclipsing binaries. Part I investigates kinematical biases between two methods of detecting exoplanets; the ground based transit and radial velocity methods. Distances of the host stars from each method lie in almost non-overlapping groups. Samples of host stars from each group are selected. They are compared by means of matching comparison samples of stars not known to have exoplanets. The detection methods are found to introduce a negligible bias into the metallicities of the host stars but the ground based transit method introduces a median age bias of about -2 Gyr.
  • GTO Keypad Manual, V5.001

    GTO Keypad Manual, V5.001

    ASTRO-PHYSICS GTO KEYPAD Version v5.xxx Please read the manual even if you are familiar with previous keypad versions Flash RAM Updates Keypad Java updates can be accomplished through the Internet. Check our web site www.astro-physics.com/software-updates/ November 11, 2020 ASTRO-PHYSICS KEYPAD MANUAL FOR MACH2GTO Version 5.xxx November 11, 2020 ABOUT THIS MANUAL 4 REQUIREMENTS 5 What Mount Control Box Do I Need? 5 Can I Upgrade My Present Keypad? 5 GTO KEYPAD 6 Layout and Buttons of the Keypad 6 Vacuum Fluorescent Display 6 N-S-E-W Directional Buttons 6 STOP Button 6 <PREV and NEXT> Buttons 7 Number Buttons 7 GOTO Button 7 ± Button 7 MENU / ESC Button 7 RECAL and NEXT> Buttons Pressed Simultaneously 7 ENT Button 7 Retractable Hanger 7 Keypad Protector 8 Keypad Care and Warranty 8 Warranty 8 Keypad Battery for 512K Memory Boards 8 Cleaning Red Keypad Display 8 Temperature Ratings 8 Environmental Recommendation 8 GETTING STARTED – DO THIS AT HOME, IF POSSIBLE 9 Set Up your Mount and Cable Connections 9 Gather Basic Information 9 Enter Your Location, Time and Date 9 Set Up Your Mount in the Field 10 Polar Alignment 10 Mach2GTO Daytime Alignment Routine 10 KEYPAD START UP SEQUENCE FOR NEW SETUPS OR SETUP IN NEW LOCATION 11 Assemble Your Mount 11 Startup Sequence 11 Location 11 Select Existing Location 11 Set Up New Location 11 Date and Time 12 Additional Information 12 KEYPAD START UP SEQUENCE FOR MOUNTS USED AT THE SAME LOCATION WITHOUT A COMPUTER 13 KEYPAD START UP SEQUENCE FOR COMPUTER CONTROLLED MOUNTS 14 1 OBJECTS MENU – HAVE SOME FUN!
  • Legislators Hear Local Concerns for Upcoming Budget Session Progress

    Legislators Hear Local Concerns for Upcoming Budget Session Progress

    SANDOVAL PLACITAS PRSRT-STD U.S. Postage Paid BERNALILLO Placitas, NM CORRALES Permit #3 SANDOVAL Postal Customer or COUNTY Current Resident SignPOSt ECRWSS NEW MEXICO A N I NDEPENDENT L OCAL N EWSPAPER S INCE 1988 • VOL. 30 / NO .1 • JANUARY 2018 • FREE LLIS Progress on county oil E and gas ordinance hits ACK —J sudden U-turn ~BILL D IVEN The contentious and long-struggling attempt to impose zoning regulations on oil and gas devel- opment in rural Sandoval County devolved into uncertainty on a 4-1 vote in December. A month earlier, Sandoval County commis- sioners approved Commissioner David Heil’s amendments to a proposed ordinance and agreed to act on publishing the ordinance at their December 14 meeting. All passed on 4-1 votes. With a favorable vote on publishing legal notices, the commission would have been free to take final action on the ordinance on January 18, its one meeting scheduled for the month. Instead the wheels came off. Setting the stage was Planning Director Mike Springfield acknowledging the ordinance View of Sandias and Rio Grande from Coronado Historic Site in Bernalillo amended in November contained erroneous noise limits for well drilling and production. Those were shown as higher than those recom- Legislators hear local concerns for upcoming mended by the Planning and Zoning Commis- sion after a public hearing in September. That administrative error had been corrected in the budget session IVEN document presented as ready for publication on ~SIGNPOST STAFF D December 14. ILL As the season of good cheer ends, the Legislature Commissioner Jay Block, who said he just convenes.
  • Solving Equations

    Solving Equations

    CHAPTER Solving Equations How far can an BEFORE athlete run in In the previous chapter you’ve . • Performed operations with integers 10 seconds? • Written and evaluated variable expressions Now In Chapter 2 you’ll study . • Using addition, multiplication, and distributive properties • Simplifying variable expressions • Solving equations using mental math • Solving equations using addition, subtraction, multiplication, or division • Solving equations with decimals WHY? So you can solve real-world problems about . • dinosaurs, p. 67 • giant pumpkins, p. 76 • fitness, p. 81 • aviation, p. 89 • mountain climbing, p. 94 • computers, p. 100 • baseball, p. 106 60 PAFL_229843_C02_CO.indd 60 12/17/08 10:58:48 AM Chapter 2 Resources Go to thinkcentral.com • Online Edition • eWorkbook • @HomeTutor • State Test Practice • More Examples • Video Tutor .BUI MATH In the Real World Track Race The world’s fastest athletes can run 100 meters in under 10 seconds. In this chapter, you will use equations to solve problems like finding the average rate at which an athlete runs a race. What do you think? Suppose an athlete runs at an average rate of 10.5 meters per second for 10 seconds. Use the formula distance ϭ rate ϫ time to find the distance the athlete runs. PAFL_229843_C02_CO.indd 61 12/17/08 10:58:54 AM CHAPTER Chapter Prerequisite Skills PREREQUISITE SKILLS QUIZ Review Vocabulary Preparing for Success To prepare for success in this chapter, test your numerical expression, p. 5 knowledge of these concepts and skills. You may want to look at the variable expression, p. 5 pages referred to in blue for additional review.
  • The Electric Sun Hypothesis

    The Electric Sun Hypothesis

    Basics of astrophysics revisited. II. Mass- luminosity- rotation relation for F, A, B, O and WR class stars Edgars Alksnis [email protected] Small volume statistics show, that luminosity of bright stars is proportional to their angular momentums of rotation when certain relation between stellar mass and stellar rotation speed is reached. Cause should be outside of standard stellar model. Concept allows strengthen hypotheses of 1) fast rotation of Wolf-Rayet stars and 2) low mass central black hole of the Milky Way. Keywords: mass-luminosity relation, stellar rotation, Wolf-Rayet stars, stellar angular momentum, Sagittarius A* mass, Sagittarius A* luminosity. In previous work (Alksnis, 2017) we have shown, that in slow rotating stars stellar luminosity is proportional to spin angular momentum of the star. This allows us to see, that there in fact are no stars outside of “main sequence” within stellar classes G, K and M. METHOD We have analyzed possible connection between stellar luminosity and stellar angular momentum in samples of most known F, A, B, O and WR class stars (tables 1-5). Stellar equatorial rotation speed (vsini) was used as main parameter of stellar rotation when possible. Several diverse data for one star were averaged. Zero stellar rotation speed was considered as an error and corresponding star has been not included in sample. RESULTS 2 F class star Relative Relative Luminosity, Relative M*R *eq mass, M radius, L rotation, L R eq HATP-6 1.29 1.46 3.55 2.950 2.28 α UMi B 1.39 1.38 3.90 38.573 26.18 Alpha Fornacis 1.33
  • The Magic Valley Astronomical Society Notes from the President February

    The Magic Valley Astronomical Society Notes from the President February

    February Highlights Notes from the President Feb. 1st, 6:45 to 9:00 PM Our first general membership meeting for the New Year will be held at 7:00 P.M. on Satur- Family night telescope day the 12th of February, 2011. We will be meeting at the Herrett Center, on the College of viewing. Centennial Obs. Southern Idaho Campus. Admission: $1.50, free for children 6 and under. Free Tom Gilbertson will host our annual telescope workshop "I Have a New Telescope, Now with paid planetarium admis- What?" If you are new to the hobby or if you have new equipment that you would like as- sion. sistance in learning how to operate, please bring it along (as well as any instruction manu- als) and our members will be happy to provide you with whatever assistance is required. Feb 12th, 7:00 pm to mid- This event is open to the general public and we encourage non-members to join us for this night Monthly Membership evening. General Meeting and Monthly free star party. Members in attendance will pair off with new (or old) telescope owners during the break- out sessions and teach them how to operate their new telescope (or old). We could use a Feb 15th, 7:00 to 9:00 PM lot of help from our members, so that no one has to wait to be helped. We had a good turn Family night telescope out last year and we expect more this year as well. Following the meeting we will take viewing. Centennial Obs. everyone with their telescopes up to the Stargazer’s Deck at the Centennial Observatory Admission: $1.50, free for for a evening of observing.
  • Pulsation Velocity Curves for 3 Cepheid Variables

    Pulsation Velocity Curves for 3 Cepheid Variables

    Pulsation Velocity Curves for 3 Cepheid Variables Kevin B. Stevenson∗ Department of Astronomy, University of Western Ontario, London, ON, N6A 3K7, Canada ABSTRACT A total of 44 usable observations were made of three of the brightest Classical Cepheids in the sky, δ Cephei, η Aquilae and ζ Geminorum. In each exposure, four Fe I spectral lines in the 6250 A˚ region were normalized, converted to a velocity span, averaged, then fitted by a model. The resulting model parameters from each exposure were then used to create a pulsation velocity curve as a function of phase and without the use of a projection factor typically used in other techniques. Acceptable agreement is found in comparing the radial velocity curves with Barnes, Bersier and Nardetto. The amplitudes of radius variation, used in the Baade- Wesselink method, were determined to be 3.54 × 106, 4.59 × 106 and 4.75 × 106 km for δ Cephei, η Aquilae and ζ Geminorum, respectively. Keywords: Cepheid variables, Delta Cephei, Eta Aquilae, Zeta Geminorum, radial velocity, Baade-Wesselink 1. INTRODUCTION A Cepheid variable is a particular type of variable star, an intrinsic pulsating variable. The variability is caused by physical changes within the star itself which causes its radius to expand and contract periodically. This process is part of its natural evolution as it ages and occurs in the instability strip of the Hertzsprung-Russell (HR) Diagram. A Cepheid varies in luminosity and spectral type with a generally stable, well determined period. Once its period is known, the star’s absolute magnitude can be precisely determined using the following empirically derived relation: Mν = −2.76 log(Π) − 1.4, (1) where Mν is the absolute magnitude and Π is the period in days.
  • Atmospheric Activity in Red Dwarf Stars

    Atmospheric Activity in Red Dwarf Stars

    CONTENTS SUMMARY AND CONCLUSIONS PAPERS ON CHROMOSPHERIC LINES IN RED DWARF FLARE STARS I. AD LEONIS AND GX ANDROMEDAE B. R. Pettersen and L. A. Coleman, 1981, Ap.J. 251, 571. II. EV LACERTAE, EQ PEGASI A, AND V1054 OPHIUCHI B. R. Pettersen, D. S. Evans, and L. A. Coleman, 1984, Ap.J. 282, 214. III. AU MICROSCOPII AND YY GEMINORUM B. R. Pettersen, 1986, Astr. Ap., in press. IV. V1005 ORIONIS AND DK LEONIS B. R. Pettersen, 1986, Astr. Ap., submitted. V. EQ VIRGINIS AND BY DRACONIS B. R. Pettersen, 1986, Astr. Ap., submitted. PAPERS ON FLARE ACTIVITY VI. THE FLARE ACTIVITY OF AD LEONIS B. R. Pettersen, L. A. Coleman, and D. S. Evans, 1984, Ap.J.suppl. 5£, 275. VII. DISCOVERY OF FLARE ACTIVITY ON THE VERY LOW LUMINOSITY RED DWARF G 51-15 B. R. Pettersen, 1981, Astr. Ap. 95, 135. VIII. THE FLARE ACTIVITY OF V780 TAU B. R. Pettersen, 1983, Astr. Ap. 120, 192. IX. DISCOVERY OF FLARE ACTIVITY ON THE LOW LUMINOSITY RED DWARF SYSTEM G 9-38 AB B. R. Pettersen, 1985, Astr. Ap. 148, 151. Den som påstår seg ferdig utlært, - han er ikke utlært, men ferdig. 1 ATMOSPHERIC ACTIVITY IN RED DWARF STARS SUMMARY AND CONCLUSIONS Active and inactive stars of similar mass and luminosity have similar physical conditions in their photospheres/ outside of magnetically disturbed regions. Such field structures give rise to stellar activity, which manifests itself at all heights of the atmosphere. Observations of uneven distributions of flux across the stellar disk have led to the discovery of photospheric starspots, chromospheric plage areas, and coronal holes.
  • Astronomie Pentru Şcolari

    Astronomie Pentru Şcolari

    NICU GOGA CARTE DE ASTRONOMIE Editura REVERS CRAIOVA, 2010 Referent ştiinţific: Prof. univ.dr. Radu Constantinescu Editura Revers ISBN: 978-606-92381-6-5 2 În contextul actual al restructurării învăţământului obligatoriu, precum şi al unei manifeste lipse de interes din partea tinerei generaţii pentru studiul disciplinelor din aria curiculară Ştiinţe, se impune o intensificare a activităţilor de promovare a diferitelor discipline ştiinţifice. Dintre aceste discipline Astronomia ocupă un rol prioritar, având în vedere că ea intermediază tinerilor posibilitatea de a învăţa despre lumea în care trăiesc, de a afla tainele şi legile care guvernează Universul. În plus, anul 2009 a căpătat o co-notaţie specială prin declararea lui de către UNESCO drept „Anul Internaţional al Astronomiei”. În acest context, domnul profesor Nicu Goga ne propune acum o a doua carte cu tematică de Astronomie. După apariţia lucrării Geneza, evoluţia şi sfârşitul Universului, un volum care s+a bucurat de un real succes, apariţia lucrării „Carte de Astronomie” reprezintă un adevărat eveniment editorial, cu atât mai mult cu cât ea constitue în acelaşi timp un material monografic şi un material cu caracter didactic. Cartea este structurată în 13 capitole, trecând în revistă problematica generală a Astronomiei cu puţine elemente de Cosmologie. Cartea îşi propune şi reuşeşte pe deplin să ofere răspunsuri la câteva întrebări fundamentale şi tulburătoare legate de existenţa fiinţei umane şi a dimensiunii cosmice a acestei existenţe, incită la dialog şi la dorinţa de cunoaştere. Consider că, în ansamblul său, cartea poate contribui la îmbunătăţirea educaţiei ştiinţifice a tinerilor elevi şi este deosebit de utilă pentru toţi „actorii” implicaţi în procesul de predare-învăţare: elevi, părinţi, profesori.
  • Star Name Identity SAO HD FK5 Magnitude Spectral Class Right Ascension Declination Alpheratz Alpha Andromedae 73765 358 1 2,06 B

    Star Name Identity SAO HD FK5 Magnitude Spectral Class Right Ascension Declination Alpheratz Alpha Andromedae 73765 358 1 2,06 B

    Star Name Identity SAO HD FK5 Magnitude Spectral class Right ascension Declination Alpheratz Alpha Andromedae 73765 358 1 2,06 B8IVpMnHg 00h 08,388m 29° 05,433' Caph Beta Cassiopeiae 21133 432 2 2,27 F2III-IV 00h 09,178m 59° 08,983' Algenib Gamma Pegasi 91781 886 7 2,83 B2IV 00h 13,237m 15° 11,017' Ankaa Alpha Phoenicis 215093 2261 12 2,39 K0III 00h 26,283m - 42° 18,367' Schedar Alpha Cassiopeiae 21609 3712 21 2,23 K0IIIa 00h 40,508m 56° 32,233' Deneb Kaitos Beta Ceti 147420 4128 22 2,04 G9.5IIICH-1 00h 43,590m - 17° 59,200' Achird Eta Cassiopeiae 21732 4614 3,44 F9V+dM0 00h 49,100m 57° 48,950' Tsih Gamma Cassiopeiae 11482 5394 32 2,47 B0IVe 00h 56,708m 60° 43,000' Haratan Eta ceti 147632 6805 40 3,45 K1 01h 08,583m - 10° 10,933' Mirach Beta Andromedae 54471 6860 42 2,06 M0+IIIa 01h 09,732m 35° 37,233' Alpherg Eta Piscium 92484 9270 50 3,62 G8III 01h 13,483m 15° 20,750' Rukbah Delta Cassiopeiae 22268 8538 48 2,66 A5III-IV 01h 25,817m 60° 14,117' Achernar Alpha Eridani 232481 10144 54 0,46 B3Vpe 01h 37,715m - 57° 14,200' Baten Kaitos Zeta Ceti 148059 11353 62 3,74 K0IIIBa0.1 01h 51,460m - 10° 20,100' Mothallah Alpha Trianguli 74996 11443 64 3,41 F6IV 01h 53,082m 29° 34,733' Mesarthim Gamma Arietis 92681 11502 3,88 A1pSi 01h 53,530m 19° 17,617' Navi Epsilon Cassiopeiae 12031 11415 63 3,38 B3III 01h 54,395m 63° 40,200' Sheratan Beta Arietis 75012 11636 66 2,64 A5V 01h 54,640m 20° 48,483' Risha Alpha Piscium 110291 12447 3,79 A0pSiSr 02h 02,047m 02° 45,817' Almach Gamma Andromedae 37734 12533 73 2,26 K3-IIb 02h 03,900m 42° 19,783' Hamal Alpha