Pyörivä muuttuja

Pyörivät muuttujat ovat muuttuvien tähtien ryhmä, joissa suuret tähdenpilkut aiheuttavat tähden kirkkauden vaihteluja. Esimerkiksi Alfa Canum Venaticiorum -tyypissä havaitaan voimakkaita magneettikenttiä ja säteilyn polarisaatiota sekä alkuaineiden lajittumista tähden pinnalla magneettikentissä.

Pyöriviä muuttujia ovat muun muassa

Ellipsoidimuuttuja

Ellipsoidimuuttuja on lähekkäinen kaksoistähti, jossa ei tapahdu pimennyksiä. Näiden muuttujien lyhenne on Ell. Valonvaihtelu on alle 0,2 magnitudin luokkaa. Ellipsoidimuuttujan komponentit ovat venyneet mutteivät kosketa toisiaan. Myös ellipsoidimuuttujat luetaan pyöriviin muuttujiin, vaikka ne ovatkin pimennysmuuttujia muistuttavia geometrisia muuttujia. Niiden valonvaihtelu johtuu niiden pyörimisestä ja soikeasta tai pisaramaisesta muodosta. Esimerkkejä ellipsoidimuuttujasta ovat tähdet Zeta Andromedae, Pii-5 Orionis (π5 Ori, b1 Persei ("bee" Persei, ei "beta") ja Y Aquilae.

Read other articles:

Swedish footballer Billy Nordström Personal informationFull name Billy Brandon NordströmDate of birth (1995-09-18) 18 September 1995 (age 28)Place of birth Gothenburg, SwedenHeight 1.80 m (5 ft 11 in)Position(s) Left backYouth career2001–2004 Rannebergens IF2005–2014 IFK GöteborgSenior career*Years Team Apps (Gls)2015–2018 IFK Göteborg 36 (0)2017 → Varbergs BoIS (loan) 13 (0)2019 IF Brommapojkarna 26 (0)2020–2021 Östers IF 32 (0)2022 Utsikten 0 (0)Internatio...

 

Not to be confused with Astronomy and Astrophysics. Academic journalJournal of Astrophysics and AstronomyLanguageEnglishEdited byAnnapurni SubramaniamPublication detailsHistory1980–presentPublisherSpringer India, Indian Academy of Sciences, and Astronomical Society of IndiaFrequencyBimonthlyImpact factor1.61 (2021)Standard abbreviationsISO 4 (alt) · Bluebook (alt1 · alt2)NLM (alt) · MathSciNet (alt )ISO 4J. Astrophys. Astron.IndexingCODEN (alt&...

 

Pour les articles homonymes, voir Siège de Paris. Si ce bandeau n'est plus pertinent, retirez-le. Cliquez ici pour en savoir plus. Cet article ne cite pas suffisamment ses sources (septembre 2016). Si vous disposez d'ouvrages ou d'articles de référence ou si vous connaissez des sites web de qualité traitant du thème abordé ici, merci de compléter l'article en donnant les références utiles à sa vérifiabilité et en les liant à la section « Notes et références ». En p...

Gunung PenanggunganGunung PenanggunganTitik tertinggiKetinggian1 653 m (5 423 kaki)Koordinat7°36′54″S 112°37′12″E / 7.615°S 112.62°E / -7.615; 112.62 GeografiLetakKabupaten Pasuruan dan Kabupaten Mojokerto, Jawa Timur, IndonesiaGeologiJenis gunungStratovolcano Gunung Penanggungan (nama kuno: Gunung Pawitra) (1.653 m dpl) adalah gunung berapi kerucut dalam kondisi istirahat yang berada di Jawa Timur, Indonesia. Posisinya berada di perbatasan dua kabupa...

 

AwardOverseas Territories Police MedalFormerly Colonial Police MedalRibbon bar of the CPM for GallantryRibbon bar of medal for Meritorious ServiceTypeMedalAwarded forgallantry or distinguished serviceCountryBritish Overseas TerritoriesPresented bythe King of the United KingdomEligibilitypolice officers in British Overseas Territories, Crown Colonies, and British Dependent TerritoriesPost-nominalsCPM (until 2012)OTPM (from 2012)StatusCPM for Meritorious Service currently awardedCPM for Gallan...

 

Земская почтаУезды Алатырский Александрийский Ананьевский Ардатовский Арзамасский Аткарский Ахтырский Балашовский Бахмутский Бежецкий Белебеевский Белозерский Бердянский Бобровский Богородский Богучарский Борисоглебский Боровичский Бронницкий Бугульминский Бу�...

Newspaper in France La Libre ParoleTypeDaily newspaperOwner(s)Édouard DrumontFoundedApril 1892Political alignment1892-1910AntisemitismPopulismAnti-capitalism1910-1924Political CatholicismLanguageFrenchCeased publicationJune 1924ISSN1256-0294 Part of a series onAntisemitism Part of Jewish history and discrimination History Timeline Reference Definitions IHRA definition of antisemitism Jerusalem Declaration on Antisemitism Nexus Document Three Ds Geography Argentina Australia Austria Belarus B...

 

ХуторХерсоны 48°54′34″ с. ш. 39°53′57″ в. д.HGЯO Страна  Россия Субъект Федерации Ростовская область Муниципальный район Миллеровский Сельское поселение Волошинское История и география Часовой пояс UTC+3:00 Название жителей херсонцы Цифровые идентификаторы Телефо...

 

This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: Trubion – news · newspapers · books · scholar · JSTOR (May 2009) (Learn how and when to remove this message) TrubionCompany typePublic companyTraded asNasdaq: TRBNIndustryBiopharmaceuticalFounded1999Fateacquired by Emergent BioSolutions (2010)HeadquartersSeattle, WAProductsProtein-based therapeuticsWe...

Prince Albert v StrangeCourtHigh Court of ChanceryDecided1849 Before Going to Bed - three views of Princess Vicky at the age of two, drawn and etched by Queen Victoria in 1843 Prince Albert v Strange was a court decision made by the High Court of Chancery in 1849, and began the development of confidence law in England.[1] The court awarded Prince Albert an injunction, restraining Strange from publishing a catalogue describing Prince Albert's etchings. Lord Cottenham LC noted that thi...

 

Musik Dansa Musik Britania (Musik Inggris Raya) adalah musik yang bermula dari musik dansa yang dimainkan oleh orang biasa.[1] Musik ini berkembang dari satu desa ke desa lainnya dan diwariskan dari generasi ke generasi.[1] Selama tiga puluh tahun terakhir musik pop Britania telah memimpin dunia melalui berbagai tren baru.[1] Selain itu, Britania bersama Amerika Serikat adalah negara yang berkontribusi dalam pengembangan musik rock and roll dan Britania telah melahiran...

 

Semi-aquatic species of the spiny rat family For the colour, see Nutria (colour). Coypu redirects here. For the boat, see Coypu (dinghy). NutriaTemporal range: Late Pliocene – Recent PreꞒ Ꞓ O S D C P T J K Pg N ↓ Conservation status Least Concern  (IUCN 3.1)[1] Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Rodentia Family: Echimyidae Subfamily: Echimyinae Tribe: Myocastorini Genus: Myocastor Species: M. coyp...

الإجهاض Abortion إجهاض معلومات عامة الاختصاص طب التوليد  من أنواع إجراء طبي،  وقتل الجنين،  وتخلي  [لغات أخرى]‏  الإدارة حالات مشابهة إجهاض تلقائي،  وولادة جنين ميت،  وولادة مبكرة،  وقتل الرضيع،  وتحريض المخاض  التاريخ وصفها المصدر الموسوعة الكا�...

 

Questa voce sull'argomento calciatori italiani è solo un abbozzo. Contribuisci a migliorarla secondo le convenzioni di Wikipedia. Segui i suggerimenti del progetto di riferimento. Walter De VecchiDe Vecchi al Milan nella stagione 1979-1980Nazionalità Italia Altezza182 cm Peso71 kg Calcio RuoloAllenatore (ex centrocampista) Termine carriera1992 - giocatore CarrieraGiovanili 19??-19?? Milan Squadre di club1 1973-1974 Milan1 (0)1974-1975 Varese9 (0)1975-1978 Monz...

 

Sudaryono Wakil Menteri Pertanian Indonesia ke-7PetahanaMulai menjabat 18 Juli 2024PresidenJoko WidodoMenteriAmran SulaimanPendahuluHarvick Hasnul QolbiPenggantiPetahanaKetua DPD Partai Gerindra Jawa TengahPetahanaMulai menjabat 18 Oktober 2023Ketua UmumPrabowo SubiantoPendahuluAbdul WachidPenggantiPetahana Informasi pribadiLahir23 Januari 1985 (umur 39)Grobogan, Jawa Tengah, IndonesiaPartai politikGerindraAlma materSMA Taruna Nusantara National Defense Academy of JapanUniver...

Clamart   Comuna francesa    A Prefeitura.A Prefeitura. Símbolos Brasão de armas Gentílico Clamartois/es Localização ClamartLocalização de Clamart na França Coordenadas 48° 49′ 30″ N, 2° 16′ 00″ L País  França Região Ilha de França Departamento Altos do Sena Administração Prefeito Jean-Didier Berger (LR) Características geográficas Área total 8,77 km² População total (2018) 53 429 hab. Densidade 6 092,2 hab./km² Alti...

 

Chinese Chan Buddhist monk This article is about the contemporary Buddhist monk. For the city, now a district, previously in Republic of China's Chahar Province and now part of Hebei, see Xuanhua District. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Hsuan Hua – news · newspapers · books · scholar · JSTOR...

 

قبعة ذات قرنين من فرنسا، 1790 قبعة ذات قرنين (بالإنجليزية: Bicorne) هو شكل التاريخي لقبعة اعتمدت على نطاق واسع في عقد 1790 كعلامة موحدة من قبل الأوروبييون والجيش الأمريكي وضباط البحرية.[1][2][3] كان معظم الجنرالات وضباط الأركان في الفترة النابليونية يرتدون القبعة ذات الق...

Association football club in Scotland Football clubAlvaFull nameAlva Football ClubNickname(s)the Hillfoots[1]Founded1887Dissolved1895GroundEast End Park, Craigleith Park, Glebe ParkHon. SecretaryAndrew WrightMatch SecretaryW. Dobbie Home colours Alva Football Club was a football club based in Alva, Clackmannanshire. History The first association football club in Alva was an army Volunteer club, which played a few low-key matches in the mid-1880s.[2] One ill-tempered match with...

 

You can help expand this article with text translated from the corresponding article in Russian. (April 2013) Click [show] for important translation instructions. View a machine-translated version of the Russian article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikip...