Stellar isochrone

Theoretical isochrones for near-solar metallicity and a range of ages

In stellar evolution, an isochrone is a curve on the Hertzsprung-Russell diagram, representing a population of stars of the same age but with different mass.[1]

The Hertzsprung-Russell diagram plots a star's luminosity against its temperature, or equivalently, its color. Stars change their positions on the HR diagram throughout their life. Newborn stars of low or intermediate mass are born cold but extremely luminous. They contract and dim along the Hayashi track, decreasing in luminosity but staying at roughly the same temperature, until reaching the main sequence directly or by passing through the Henyey track. Stars evolve relatively slowly along the main sequence as they fuse hydrogen, and after the vast majority of their lifespan, all but the least massive stars become giants. They then evolve quickly towards their stellar endpoints: white dwarfs, neutron stars, or black holes.

Isochrones can be used to date open clusters because their members all have roughly the same age.[2] One of the first uses of an isochrone method to date an open cluster was by Demarque and Larson in 1963.[3] If the initial mass function of the open cluster is known, isochrones can be calculated at any age by taking every star in the initial population, using numerical simulations to evolve it forwards to the desired age, and plotting the star's luminosity and magnitude on the HR diagram.[4] The resulting curve is an isochrone, which can be compared against the observational color-magnitude diagram to determine how well they match. If they match well, the assumed age of the isochrone is close to the actual age of the cluster.

See also

References

  1. ^ Kippenhahn, Rudolf; Weigert, Alfred; Weiss, Achim (2012), Stellar Structure and Evolution (2nd ed.), Springer, p. 328, ISBN 978-3642302558
  2. ^ Frebel, Anna (2015), Searching for the Oldest Stars: Ancient Relics from the Early Universe, Princeton University Press, p. 149, ISBN 978-1400874286.
  3. ^ Demarque, P.R.; Larson, R.B. (1964), "The Age of Galactic Cluster NGC 188", Astrophysical Journal, 140: 544, Bibcode:1964ApJ...140..544D, doi:10.1086/147948
  4. ^ Friel, E.D. (1995), "The Old Open Clusters of the Milky Way", Annual Review of Astronomy and Astrophysics, 33: 381–414, Bibcode:1995ARA&A..33..381F, doi:10.1146/annurev.aa.33.090195.002121

Read other articles:

Ward No. 1, Kolkata Municipal Corporation

Kolkata Municipal Corporation in West Bengal, IndiaWard No. 1Kolkata Municipal CorporationInteractive Map Outlining Ward No. 1Ward No. 1Location in KolkataCoordinates: 22°37′04″N 88°22′14″E / 22.617889°N 88.370556°E / 22.617889; 88.370556Country IndiaStateWest BengalCityKolkataNeighbourhood coveredCossiporeReservationOpenParliamentary constituencyKolkata UttarAssembly constituencyKashipur-BelgachhiaBurough1Elevation36 ft (11 m)Population...

 

Rebel Inc. (video game)

2018 video gameRebel Inc.Developer(s)Ndemic CreationsPublisher(s)Ndemic CreationsDesigner(s)James VaughanProgrammer(s)Gerard MeierDaniel WestonTim LaneArtist(s)Mario HrosVander MouleRosanna VaughanComposer(s)Marius MalasarJoe HamiltonPlatform(s)iOS, Android, Windows, macOSReleaseiOSWW: 8 December 2018AndroidWW: 11 February 2019WindowsWW: 15 October 2019Mode(s)Cooperative video game  Rebel Inc. is a strategy video game developed and released by Ndemic Creations for iOS in December 2018. I...

 

Kedidir Pulau Selatan

Kedidir Pulau Selatan Haematopus finschi Status konservasiRisiko rendahIUCN22693632 TaksonomiKerajaanAnimaliaFilumChordataKelasAvesOrdoCharadriiformesFamiliHaematopodidaeGenusHaematopusSpesiesHaematopus finschi DistribusiEndemikSelandia Baru lbs Kedidir Pulau Selatan atau kedidir belang Pulau Selatan ( Haematopus finschi ) adalah salah satu dari dua spesies kedidir yang umum ditemukan di Selandia Baru . Namanya sering disingkat menjadi akronim SIPO (South Island Pied Oystercatcher). Nama asli...

Serie D 1969-1970

Serie D 1969-1970 Competizione Serie D Sport Calcio Edizione 11ª Organizzatore Lega Semiprofessionisti Luogo  Italia Partecipanti 162 Formula 9 gironi all'italiana Risultati Promozioni Imperia, Parma;Trento, Maceratese;Montevarchi, Viterbese;Savoia, Martina;Enna. Retrocessioni (le squadre scritte in corsivo sono poi state riammesse)Pro Molare, Sanremese;Alassio, Lilion Snia Varedo;Voghera, Pro Palazzolo;Montebelluna, Torvis Snia; Maniago, Vigor Senigallia;Urbino, Faenza;Angelana, Poggi...

 

David Johnston

His Excellency the Right HonourableDavid Lloyd JohnstonCC, CMM, COMJohnston di depan Brubacher House. Gubernur Jenderal Kanada 28Masa jabatan1 Oktober 2010 – 2 Oktober 2017Penguasa monarkiElizabeth IIPerdana MenteriStephen Harper, Justin Trudeau PendahuluMichaëlle JeanPenggantiJulie Payette Informasi pribadiLahir28 Juni 1941 (umur 82)Sudbury, OntarioSuami/istriSharon JohnstonAlma materUniversitas HarvardUniversitas CambridgeQueen's UniversityProfesiAkademisiPengacaraTanda...

 

Lencam

Lencam Lethrinus obsoletus Klasifikasi ilmiah Domain: Eukaryota Kerajaan: Animalia Filum: Chordata Kelas: Actinopterygii Ordo: Perciformes Superfamili: Percoidea Famili: LethrinidaeBonaparte, 1831 Subfamili beserta genus Subfamili Lethrininae Genus Lethrinus Subfamili Monotaxinae Genus Gnathodentex Genus Gymnocranius Genus Monotaxis Genus Wattsia Lencam (Lethrinidae) adalah keluarga Ikan laut yang termasuk dalam famili Lethrinidae yang dikenal dalam Bahasa Inggris sebagai emperor. Ikan ini m...

Promozione Lombardia 1969-1970

Voce principale: Promozione 1969-1970. Promozione Lombardia 1969-1970 Competizione Promozione Sport Calcio Edizione 14ª Organizzatore FIGC - LNDComitato Regionale Lombardo Luogo  Italia Cronologia della competizione 1968-1969 1970-1971 Manuale Nella stagione 1969-1970 la Promozione era il quinto livello del calcio italiano (il massimo livello regionale). Qui vi sono le statistiche relative al campionato in Lombardia. Il campionato di Promozione Lombarda 1969-70 è stato il 14º campion...

 

Tokoh Asyur

Artikel ini sebatang kara, artinya tidak ada artikel lain yang memiliki pranala balik ke halaman ini.Bantulah menambah pranala ke artikel ini dari artikel yang berhubungan atau coba peralatan pencari pranala.Tag ini diberikan pada Januari 2023. Tokoh Asyur adalah tokoh-tokoh dari budaya Asyur kuno. Terdiri dari para penguasa Kerajaan Asyur, maupun pembesar-pembesar yang lain. Dalam sejarahnya yang panjang, Asyur mengalami naik turunnya kejayaan. Catatan-catatan sejarah Asyur telah banyak dike...

 

Auguste Comte

French philosopher, mathematician and sociologist (1798–1857) This article or section may need to be formatted. You can help Wikipedia by formatting it if you know how. Please also consider changing this notice to be more specific. (March 2020) Auguste ComteComte in 1849BornIsidore Marie Auguste François Xavier Comte(1798-01-19)19 January 1798Montpellier, French First RepublicDied5 September 1857(1857-09-05) (aged 59)Paris, Second French EmpireEducationUniversity of MontpellierÉ...

Pacte germano-soviétique

Pacte germano-soviétique Modifications territoriales prévues par le pacte et finalement effectuées. Données clés Langues Russe et allemand Données clés Signé 23 août 1939Moscou (URSS) Parties Parties Union soviétique  Reich allemand Signataires Viatcheslav Molotov pour Joseph Staline Joachim von Ribbentrop pour Adolf Hitler modifier Conséquences territoriales et démographiques du pacte germano-soviétique. Le Pacte germano-soviétique, ou pacte Molotov–Ribbentrop, est un a...

 

Recognition of same-sex unions in Hong Kong

Part of the LGBT rights seriesLegal status ofsame-sex unions Marriage Andorra Argentina Australia Austria Belgium Brazil Canada Chile Colombia Costa Rica Cuba Denmark Ecuador Estonia Finland France Germany Greece Iceland Ireland Luxembourg Malta Mexico Nepal Netherlands1 New Zealand2 Norway Portugal Slovenia South Africa Spain Sweden Switzerland Taiwan United Kingdom3 United States4 Uruguay Recognized Israel5 Civil unions andregistered partnerships Bolivia Croatia Cyprus Czech Republic Hunga...

 

Gambela (ville)

Ne pas confondre avec la région Gambela Gambela ጋምቤላ Gambela – Vue Administration Pays Éthiopie Région Gambela Zone Anuak Démographie Population 32 613 hab. (est. 2007) Géographie Coordonnées 8° 15′ nord, 34° 35′ est Altitude 526 m Localisation Géolocalisation sur la carte : Éthiopie Gambela Géolocalisation sur la carte : Éthiopie Gambela modifier  Gambela (Ge'ez: ጋምቤላ) est une ville et woreda d'Éthiopie et ...

India women's cricket team in Australia in 2021–22

International cricket tour     Australia women India womenDates 21 September – 10 October 2021Captains Meg Lanning Mithali Raj (WTest and WODIs)Harmanpreet Kaur (WT20Is)Test seriesResult 1-match series drawn 0–0Most runs Ellyse Perry (69) Smriti Mandhana (158)Most wickets Sophie Molineux (3) Pooja Vastrakar (4)One Day International seriesResults Australia women won the 3-match series 2–1Most runs Beth Mooney (177) Smriti Mandhana (124)Most wickets Darcie Brown (5)Sophie M...

 

Fifth Hasina ministry

Cabinet of Bangladesh (2024-) This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources.Find sources: Fifth Hasina ministry – news · newspapers · books · scholar · JSTOR (January 2024) Fifth Hasina Ministry21st Cabinet of BangladeshSheikh Hasina Wazed Hon'ble Prime Minister of BangladeshDate formed11 January 202...

 

西遊記大結局之仙履奇緣

本條目存在以下問題，請協助改善本條目或在討論頁針對議題發表看法。 此條目需要編修，以確保文法、用詞、语气、格式、標點等使用恰当。 (2013年8月6日)請按照校對指引，幫助编辑這個條目。（幫助、討論） 此條目剧情、虛構用語或人物介紹过长过细，需清理无关故事主轴的细节、用語和角色介紹。 (2020年10月6日)劇情、用語和人物介紹都只是用於了解故事主軸，輔助�...

Australian Security Intelligence Organisation

ASIO redirects here. For computer sound card driver protocol for digital audio, see Audio Stream Input/Output. For other uses, see ASIO (disambiguation). Not to be confused with Australian Secret Intelligence Service. Australian domestic intelligence agency 35°17′33.6″S 149°8′40.1″E / 35.292667°S 149.144472°E / -35.292667; 149.144472 Australian Security Intelligence OrganisationAgency overviewFormed16 March 1949; 75 years ago (1949-03-16)J...

 

Pao An Tui

Pao An TuiRekrutan Pao An Tui di BandungPemimpinLoa Sek Hie (Chairman) Oey Kim Sen (Deputi Chairman) Khouw Joe Tjan (Sekretaris) Cong Fai-kim (Bendahara)Waktu operasi1946-1949MarkasBatavia, Hindia BelandaWilayah operasiSebagian Jawa, Sumatra, dan BorneoSekutu Hindia Belanda NICA KNIL Indonesia Timur Republik Tiongkok[1] Kuomintang Lawan  Indonesia PDRI Sukarelawan Jepang (setelah tahun 1946) Pao An Tui (Hanzi tradisional: 保安隊; Hanzi sederhana: 保安队; P...

 

1. Bundesliga 2016-2017 (femminile)

1. Bundesliga 2016-2017 Competizione 1. Bundesliga Sport Pallavolo Edizione XXV Organizzatore DVV Date dal 22 ottobre 2016al 26 aprile 2017 Luogo  Germania Partecipanti 12 Risultati Vincitore  Schweriner(11º titolo) Secondo  MTV Stoccarda Retrocessioni  Erfurt Statistiche Miglior marcatore Roslandy Acosta (337)[1] Incontri disputati 154 Cronologia della competizione 2015-16 2017-18 Manuale La 1. Bundesliga 2016-2017 si è svolta dal 22 ottobre 2...

Neurotypical (film)

This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (February 2019) (Learn how and when to remove this message) 2013 American filmNeurotypicalFilm posterDirected byAdam LarsenRelease date July 29, 2013 (2013-07-29) Running time52 minutesCountryUnited StatesLanguageEnglish Neurotypical is a 2013 documentary film directed by Adam Larsen. The film show...

 

William Smith (geolog)

William SmithWilliam Smith pada 1837Lahir(1769-03-23)23 Maret 1769Churchill, OxfordshireMeninggal28 Agustus 1839(1839-08-28) (umur 70)KebangsaanInggrisDikenal atasPeta geologi Inggris dan WalesPenghargaanWollaston Medal (1831)Karier ilmiahBidangGeologi William 'Strata' Smith (23 Maret 1769 – 28 Agustus 1839) adalah seorang geolog Inggris yang dikenal karen menciptakan peta geologi mendetil pertama dari suatu negara.[1] Ia dikenal sebagai Bapak Geologi Inggris. ...