Blazhko effect

The Blazhko effect, also known as the Tseraskaya–Blazhko effect,[1] and which is sometimes called long-period modulation, is a variation in period and amplitude in RR Lyrae type variable stars. Sergey Blazhko first reported its observation by Lidiya Tseraskaya in 1907, in the star RW Draconis.[2][3]

The physics behind the Blazhko effect is currently still a matter of debate, with there being three primary hypotheses. In the first, referred to as the resonance model, the cause of the modulation is a non-linear resonance among either the fundamental or the first overtone pulsation mode of the star and a higher mode.[4][5] The second, known as the magnetic model, assumes the variation to be caused by the magnetic field being inclined to the rotational axis, deforming the main radial mode. The magnetic model was ruled out in 2004 by high resolution spectro-polarimetric observations.[6] The third model assumes that cycles in the convection cause the alternations and the modulations.[7]

Observational evidence based on Kepler space telescope observations indicates much of the Blazhko effect's two-cycle light curve modulation is due to simple period-doubling. Many RR Lyrae stars have a variability period of approximately 12 hours and ground-based astronomers typically make nightly observations about 24 hours apart; thus period-doubling results in brightness maximums during nightly observations that are significantly different from the daytime maximum.[8][9]

References

  1. ^ Kurtz, Donald W. (April 8, 2022). "Asteroseismology Across the Hertzsprung–Russell Diagram". Annual Review of Astronomy and Astrophysics. 60: 31–71. Bibcode:2022ARA&A..60...31K. doi:10.1146/annurev-astro-052920-094232.
  2. ^ Horace A. Smith (2004). RR Lyrae Stars. Cambridge University Press. p. 103. ISBN 0-521-54817-9.
  3. ^ Blazhko, S. (1907), "Mitteilung über veränderliche Sterne", Astronomische Nachrichten, 175 (20): 325–328, Bibcode:1907AN....175..325B, doi:10.1002/asna.19071752002
  4. ^ Kolláth, Z.; Molnár, L.; Szabó, R. (2011), "Period-doubling bifurcation and high-order resonances in RR Lyrae hydrodynamical models", MNRAS, 414 (2): 1111–1118, arXiv:1102.0157, Bibcode:2011MNRAS.414.1111K, doi:10.1111/j.1365-2966.2011.18451.x, S2CID 118367258
  5. ^ Buchler, J. R.; Kolláth, Z. (2011), "On the Blazhko Effect in RR Lyrae Stars", Astrophysical Journal, 731 (1): 24, arXiv:1101.1502, Bibcode:2011ApJ...731...24B, doi:10.1088/0004-637x/731/1/24, S2CID 118399999
  6. ^ Chadid, M.; Wade, G. A.; Shorlin, S. L. S.; Landstreet, J. D. (2004). "No evidence of a strong magnetic field in the Blazhko star RR Lyrae". Astronomy & Astrophysics. 413 (3): 1087–1093. Bibcode:2004A&A...413.1087C. doi:10.1051/0004-6361:20031600.
  7. ^ Stothers, R. B. (2010), "Observational Evidence of Convective Cycles as the Cause of the Blazhko Effect in RR Lyrae Stars", Publications of the Astronomical Society of the Pacific, 122 (891): 536–540, Bibcode:2010PASP..122..536S, doi:10.1086/652909
  8. ^ Katrien Kolenberg (2008). "Explanations for the Blazhko effect in RR Lyrae stars". The Blazhko Project. Retrieved 2008-12-17.
  9. ^ Szabó, R.; Kolláth, Z.; Molnár, L.; et al. (2010), "Does Kepler unveil the mystery of the Blazhko effect? First detection of period doubling in Kepler Blazhko RR Lyrae stars", MNRAS, 409 (3): 1244–1252, arXiv:1007.3404, Bibcode:2010MNRAS.409.1244S, doi:10.1111/j.1365-2966.2010.17386.x, S2CID 119190883

Read other articles:

Distrik Kurokawa, Miyagi

Lokasi munisipalitas yang ada di Distrik Kurokawa, Prefektur Miyagi1. – Taiwa 2. – Ōsato3. – Tomiya (telah berubah status dari kotapraja menjadi kota, yang membuat munisipalitas ini tidak lagi berada di dalam wilayah Distrik Kurokawa) 4. – Ōhirawarna hijau - cakupan wilayah distrik saat ini Distrik Kurokawa (黒川郡code: ja is deprecated , Kurokawa-gun) adalah sebuah distrik yang terletak di Prefektur Miyagi, Jepang. Per 1 Oktober 2020, distrik ini memiliki estimasi jumlah pendudu...

 

Palet (seni lukis)

Halaman ini berisi artikel tentang papan tempat menaruh cat. Untuk papan dalam transportasi, lihat palet. Untuk tabel warna dalam komputer, lihat palet (komputasi). Palet yang sedang dipakai pelukis Palet adalah papan/lempengan tempat menaruh dan mencampurkan cat. Palet biasa dibuat dari kayu, plastik, keramik, atau bahan lain yang keras, tidak mudah bereaksi, dan tidak berpori. Ukuran dan bentuk palet beragam. Palet yang biasa dipakai oleh para pelukis terbuat dari papan kayu tipis yang dide...

 

Barakacity

BarakacityHistoireFondation 9 janvier 2010Dissolution 28 octobre 2020CadreZone d'activité Monde entierType Organisation non gouvernementale internationaleForme juridique Association déclaréeDomaines d'activité Aide humanitaire, autres organisations fonctionnant par adhésion volontaireSiège Évry-CourcouronnesPays  FranceOrganisationFondateur Idriss Sihamedi (d)Président Idriss Sihamedi (d) (depuis 2010)Site web barakacity.comIdentifiantsRNA W952001402SIREN 788779023modifier - modi...

Синелобый амазон

Синелобый амазон Научная классификация Домен:ЭукариотыЦарство:ЖивотныеПодцарство:ЭуметазоиБез ранга:Двусторонне-симметричныеБез ранга:ВторичноротыеТип:ХордовыеПодтип:ПозвоночныеИнфратип:ЧелюстноротыеНадкласс:ЧетвероногиеКлада:АмниотыКлада:ЗавропсидыКласс:Пт�...

 

العلاقات المصرية الموريتانية

العلاقات المصرية الموريتانية مصر موريتانيا   مصر   موريتانيا تعديل مصدري - تعديل   العلاقات المصرية الموريتانية هي العلاقات الثنائية التي تجمع بين مصر وموريتانيا.[1][2][3][4][5] مقارنة بين البلدين هذه مقارنة عامة ومرجعية للدولتين: وجه المقارنة...

 

Jean-Baptiste Teste

Pour les articles homonymes, voir Teste. Jean-Baptiste Teste Fonctions Député du Gard 7 mai 1815 – 13 juillet 1815(2 mois et 6 jours) Député du Gard 7 juillet 1831 – 12 juin 1842(10 ans, 11 mois et 5 jours) Ministre des Travaux Publics 29 octobre 1840 – 16 décembre 1843(3 ans, 1 mois et 17 jours) Monarque Louis-Philippe Ier Gouvernement Soult (3) Biographie Date de naissance 20 octobre 1780 Lieu de naissance Bagnols-sur-Cèze (Gard) Date de ...

Middlesex County, Connecticut

County in Connecticut, United States County in ConnecticutMiddlesex CountyCountyRaymond E Baldwin CourthouseLocation within the U.S. state of ConnecticutConnecticut's location within the U.S.Coordinates: 41°26′N 72°31′W / 41.44°N 72.52°W / 41.44; -72.52Country United StatesState ConnecticutFoundedMay, 1785Named forMiddlesex, EnglandSeatnone (since 1960)Middletown (before 1960)Largest cityMiddletownArea • Total439 sq mi (1,140...

 

Piumaggio

Disambiguazione – Piuma rimanda qui. Se stai cercando altri significati, vedi Piuma (disambigua). Disambiguazione – Piume rimanda qui. Se stai cercando il singolo di Leo Gassmann, vedi Piume (Leo Gassmann). Una piuma bianca Esempio di piuma. Il piumaggio o anche meno comunemente piura è la caratteristica principale che distingue gli uccelli da tutti gli altri esseri viventi. Esso è costituito dall'insieme delle piume e delle penne. Indice 1 Caratteristiche 2 Differenza ...

 

Hooded treepie

Species of bird Hooded treepie Conservation status Near Threatened  (IUCN 3.1)[1] Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Aves Order: Passeriformes Family: Corvidae Genus: Crypsirina Species: C. cucullata Binomial name Crypsirina cucullataJerdon, 1862 Crypsirina cucullata - (MHNT) The hooded treepie (Crypsirina cucullata) is a species of bird in the family Corvidae. It is endemic to Myanmar. Its natural habitats are subtropical o...

2020年夏季奧林匹克運動會波蘭代表團

2020年夏季奥林匹克运动会波兰代表團波兰国旗IOC編碼POLNOC波蘭奧林匹克委員會網站olimpijski.pl（英文）（波兰文）2020年夏季奥林匹克运动会（東京）2021年7月23日至8月8日（受2019冠状病毒病疫情影响推迟，但仍保留原定名称）運動員206參賽項目24个大项旗手开幕式：帕维尔·科热尼奥夫斯基（游泳）和马娅·沃什乔夫斯卡（自行车）[1]闭幕式：卡罗利娜·纳亚（皮划艇）&#...

 

2008 Serbian parliamentary election

2008 Serbian parliamentary election ← 2007 11 May 2008 2012 → All 250 seats in the National Assembly126 seats needed for a majorityTurnout61.33% ( 0.72pp) Party Leader % Seats +/– ZES Boris Tadić 39.25 102 +15 SRS Tomislav Nikolić 30.10 78 −3 DSS–NS Vojislav Koštunica 11.87 30 −13 SPS–PUPS–JS Ivica Dačić 7.75 20 +2 LDP–DHSS–SDU Čedomir Jovanović 5.35 13 +2 Minority lists MK István Pásztor 1.85 4 +1 LZS Sulejman Ugljanin 0.94 2 0 KSLP Riza Halimi...

 

Blobitecture

Organic architectural style Future Systems' blobitecture design for the 2003 Selfridges Building department store was intended to evoke the female silhouette and a famous chainmail dress designed by Paco Rabanne in the 1960s. Blobitecture (from blob architecture), blobism and blobismus are terms for a movement in architecture in which buildings have an organic, amoeba-shaped building form.[1] Though the term blob architecture was already in vogue in the mid-1990s, the word blobitectur...

Assyrians in Jordan

Ethnic group Assyrians in Jordan Total populationOfficial: 10,000-15,000 (mostly refugees)[1] Estimates: 100,000[2]-150,000[3]LanguagesNeo-Aramaic(Assyrian Neo-Aramaic, Turoyo) Jordanian Arabic Assyrians in Jordan include migrants of Assyrian origin residing in Jordan, as well as their descendants. As of June 2019, the Assyrians in Jordan number approximately 10,000-15,000;[4] however, these are mostly transient since they are refugees[5] and most of th...

 

Chlorophorus figuratus

Chlorophorus figuratus Klasifikasi ilmiah Kerajaan: Animalia Filum: Arthropoda Kelas: Insecta Ordo: Coleoptera Famili: Cerambycidae Subfamili: Cerambycinae Tribus: Clytini Genus: Chlorophorus Spesies: Chlorophorus figuratus Chlorophorus figuratus adalah spesies kumbang tanduk panjang yang tergolong familia Cerambycidae. Spesies ini juga merupakan bagian dari genus Chlorophorus, ordo Coleoptera, kelas Insecta, filum Arthropoda, dan kingdom Animalia. Larva kumbang ini biasanya mengebor ke dala...

 

قائمة مدن كانساس

هذه قائمة مدن ولاية كانساس في وسط الولايات المتحدة. ترتيب حسب عدد السكان والمقاطعة تعداد السكان مبني على إحصاء 2010، وتضم القائمة المدن التي يسكنها أكثر من 4000 نسمة.[1]   †  مقر المقاطعة   ††  عاصمة ومقر المقاطعة — ويتشيتا, أكبر مدينة في كانساس كانساس سيتي ت�...

Elections in Bermuda

Politics of Bermuda Law Monarchy Sovereign Charles III Governor Rena Lalgie Executive Premier Edward David Burt Legislative Parliament Senate President: Joan Dillas-Wright House of Assembly Speaker: Dennis Lister Leader of the Opposition: N.H. Cole Simons Elections Recent elections General: 2007201220172020 Political parties Progressive LabourParty (PLP) One BermudaAlliance (OBA) Administrative divisions Citizenship Belonger status British Overseas Territories citizen Passport Visa requireme...

 

TNT equivalent

Class of units of measurement for explosive energy Kiloton redirects here. For the similarly named weight measurements, see Tonne. TNT equivalentThe explosion from a 14-kiloton nuclear test at the Nevada Test Site, in 1951General informationUnit systemNon-standardUnit ofEnergySymbolt, ton of TNTConversions 1 t in ...... is equal to ...    SI base units   ≈ 4.184 gigajoules   CGS   109 calories TNT eq...

 

Canton d'Orsay

Canton d’Orsay Situation du canton d’Orsay dans le département de Essonne. Administration Pays France Région Île-de-France Département Essonne Arrondissement(s) Palaiseau Circonscription(s) Cinquième Chef-lieu Orsay Conseiller général Mandat David Ros (PS) 2011-2015 Code canton 91 21 Démographie Population 25 606 hab. (2012) Densité 2 109 hab./km2 Géographie Coordonnées 48° 41′ 58″ nord, 2° 11′ 15″ est Altitude Min. 5...

St Peter's Church, Dorchester

Church in Dorset, England St Peter's ChurchSt Peter's ChurchReligionAffiliationChurch of EnglandEcclesiastical or organizational statusActiveLocationLocationDorchester, Dorset, EnglandGeographic coordinates50°42′56″N 2°26′12″W / 50.7155°N 2.4368°W / 50.7155; -2.4368ArchitectureTypeChurch St Peter's Church is a Church of England church in Dorchester, Dorset, England.[1] The majority of the church dates from the 15th century, with later alterations an...

 

Нёйи-ан-Донжон

КоммунаНёйи-ан-ДонжонNeuilly-en-Donjon 46°20′45″ с. ш. 3°53′11″ в. д.HGЯO Страна  Франция Регион Овернь Департамент Алье Кантон Ле-Донжон Мэр Daniel Favier(2008–2014) История и география Площадь 25,02 км² Высота центра 258–326 м Часовой пояс UTC+1:00, летом UTC+2:00 Население Население 235 чел�...