V348 Sagittarii

V348 Sagittarii
V348 Sagittarii
ClassificazioneStella variabile
Classe spettraleB0/1?I?e
Distanza dal Sole18650 al
CostellazioneSagittario
Coordinate
(all'epoca J2000)
Ascensione retta18h 40m 19,93s
Declinazione−22° 54′ 29,3″
Dati fisici
Raggio medio180 R
Massa
1,08 M
Temperatura
superficiale
  • 3075 K (media)
Dati osservativi
Magnitudine app.
  • +11,2 (max)
Magnitudine app.12,1, 11,9732, 10,413, 8,944 e 7,34
Velocità radiale145 km/s
Nomenclature alternative
EPIC 216129500, 2MASS J18401992-2254292, IRAS 18372-2257

V348 Sagittarii è una stella variabile nella costellazione del Sagittario. La sua magnitudine varia in periodi non regolari da +11,2 a 19.[1]

Caratteristiche

V348 Sagittarii è una stella che è già passata per il ramo asintotico delle giganti (o AGB) del diagramma HR, e viene quindi talvolta menzionata come stella post-AGB. Viene classificata come variabile R Coronae Borealis, anche se per alcuni aspetti sembra presentare alcune differenze con quel tipo di stelle.[2]

La sua variabilità fu descritta da Doris Hoffleit già nel 1958, che osservò una curva di luce che oscillava dalla magnitudine 11 alla 16,5, anche se i tempi dei suoi aumenti di luminosità sono piuttosto irregolari. Osservata nel 1998 dal telescopio spaziale Hubble, è stato confermato che, come le stelle della sua classe, la diminuzione della sua luminosità è dovuta a grandi quantità di polveri di carbonio espulse, che ne offuscano la luce stellare in direzione dell'osservatore.[3]

Come tutte le stelle ricche di carbonio si trova in uno stadio avanzato della sua evoluzione, prossima al termine della sua esistenza di stella normale;[3] con un nucleo inerte che ha terminato da tempo l'idrogeno interno da fondere in elio, si è notevolmente espansa, al punto che nonostante una massa di poco superiore a quella solare (1,08 M) il suo raggio è circa 180 volte maggiore, mentre la sua temperatura superficiale è diminuita a poco più di 3000 kelvin.[4]

Note

  1. ^ V0348 Sgr, su aavso.org, AAVSO.
  2. ^ Dahari, O.; Osterbrock, D. E., The spectrum of V348 Sagittarii (PDF), Astrophysical Journal, febbraio 1984.
  3. ^ a b James H. Hecht et al., Ultraviolet Observations of the Hot R Coronae Borealis–Type Star V348 Sagittarii during a Deep Minimum, Astrophysical Journal, febbraio 1998.
  4. ^ K2 EPIC stellar properties for 138600 targets (Huber+, 2016), su vizier.u-strasbg.fr, VizieR.

Voci correlate

Collegamenti esterni

  Portale Stelle: accedi alle voci di Wikipedia che trattano di stelle e costellazioni

Read other articles:

Surat cinta yang ditulis dalam bahasa jepang Bagian dari seri tentangCintaRed-outline heart icon Jenis-jenis cinta Afeksi Ikatan Patah hati Cinta yang penuh kasih Cinta konjugal Cinta bahaduri Pacaran Troubadour Jatuh cinta Persahabatan cross-sex romantis Zona pertemanan Keramahan Hubungan antar pribadi Intimasi Limerence Kecanduan cinta Cinta pada pandangan pertama Cinta segitiga Penyakit cinta Lovestruck Cinta obsesif Passion Cinta platonik Cinta monyet Relationship Romantis Cinta diri Amou...

 

 

Stasiun Cikudapateuh B17C17 Peron Stasiun Cikudapateuh saat matahari terbit pada 2023LokasiJalan Kembang SepatuSamoja, Batununggal, Bandung, Jawa Barat 40273IndonesiaKoordinat6°55′21″S 107°37′46″E / 6.92250°S 107.62944°E / -6.92250; 107.62944Koordinat: 6°55′21″S 107°37′46″E / 6.92250°S 107.62944°E / -6.92250; 107.62944Ketinggian+691 mOperator KAI Commuter Letak km 157+772 lintas Bogor–Bandung–Banjar–Kutoarjo–Yogya...

 

 

Tanda jabatan Dewan Kerja (dari kiri ke kanan: nasional, daerah, cabang, ranting) Dewan Kerja adalah satuan organisasi di tingkat Kwartir Pramuka yang merupakan wadah pembinaan dan pengembangan kaderisasi kepemimpinan. Dewan Kerja beranggotakan Pramuka Penegak dan Pramuka Pandega Putri Putra, sebagai bagian integral dari Kwartir yang diberi wewenang dan kepercayaan untuk mengelola pembinaan dan kegiatan Pramuka Penegak dan Pramuka Pandega sesuai prinsip dari, oleh dan untuk Pramuka Penegak da...

The 1992–93 OHL season was the 13th season of the Ontario Hockey League. The Cornwall Royals become the Newmarket Royals. The Detroit Compuware Ambassadors are renamed the Detroit Junior Red Wings. The inaugural OHL Humanitarian of the Year is awarded. Sixteen teams each played 66 games. The Peterborough Petes won the J. Ross Robertson Cup, defeating the Sault Ste. Marie Greyhounds. Relocation and Rebranding Cornwall Royals to Newmarket Royals The Cornwall Royals relocated to the city of Ne...

 

 

Questa voce o sezione sull'argomento competizioni cestistiche non cita le fonti necessarie o quelle presenti sono insufficienti. Puoi migliorare questa voce aggiungendo citazioni da fonti attendibili secondo le linee guida sull'uso delle fonti. National Basketball Association 1974-1975Dettagli della competizioneSport Pallacanestro OrganizzatoreNBA Periodo17 ottobre 1974 —25 maggio 1975 Squadre18  (in 4 gironi) VerdettiTitolo East Washington Bullets Titolo West G.S. Warr...

 

 

National GeographicDiluncurkan1 September 1997[1]PemilikNational Geographic PartnersWalt Disney TelevisionSloganFurtherKantor pusatWashington, D.C., Amerika SerikatSitus web[1] National Geographic (disingkat Nat Geo, sebelumnya National Geographic Channel) merupakan sebuah jaringan televisi berlangganan yang menyiarkan dokumenter produksi National Geographic Society dan dimiliki oleh National Geographic Partners, sebuah perusahaan patungan dari National Geographic Society dan The Walt...

Town in MarylandCapitol Heights, MarylandTown FlagSealLogoLocation of Capitol Heights, MarylandCoordinates: 38°52′55″N 76°54′52″W / 38.88194°N 76.91444°W / 38.88194; -76.91444Country United States of AmericaState MarylandCounty Prince George'sIncorporated1910[1]Area[2] • Total0.78 sq mi (2.02 km2) • Land0.78 sq mi (2.02 km2) • Water0.00 sq mi (0.00 km...

 

 

   2016 Silverstone GP2 roundRound details Round 5 of 11 rounds in the 2016 GP2 Series Layout of the Silverstone CircuitLocation Silverstone CircuitSilverstone, United KingdomCourse Permanent racing facility 5.891 km (3.660 mi)GP2 SeriesFeature raceDate 9 July 2016Laps 29Pole positionDriver Norman Nato Racing EngineeringTime 1:38.216PodiumFirst Pierre Gasly Prema RacingSecond Antonio Giovinazzi Prema RacingThird Oliver Rowland MP MotorsportFastest lapDriver Mitch Evans Campos Racin...

 

 

American racing driver (1960–2020)John Paul Jr.BornJohn Lee Paul Jr.(1960-02-19)February 19, 1960Muncie, Indiana, U.S.DiedDecember 29, 2020(2020-12-29) (aged 60)Los Angeles, California, U.S.Championship titlesMajor victories 24 Hours of Daytona (1982, 1997) 12 Hours of Sebring (1982) Michigan 500 (1983)Champ Car career29 races run over 11 yearsBest finish8th (1983)First race1982 Road America 200 (Elkhart Lake)Last race1994 Indianapolis 500 (Indianapolis)First win1983 Michigan 500 (Mich...

此條目可能包含不适用或被曲解的引用资料,部分内容的准确性无法被证實。 (2023年1月5日)请协助校核其中的错误以改善这篇条目。详情请参见条目的讨论页。 各国相关 主題列表 索引 国内生产总值 石油储量 国防预算 武装部队(军事) 官方语言 人口統計 人口密度 生育率 出生率 死亡率 自杀率 谋杀率 失业率 储蓄率 识字率 出口额 进口额 煤产量 发电量 监禁率 死刑 国债 ...

 

 

غاري فليدر (بالإنجليزية: Gary Fleder)‏  معلومات شخصية الميلاد 19 ديسمبر 1965 (59 سنة)[1]  نورفولك  مواطنة الولايات المتحدة  الحياة العملية المدرسة الأم جامعة بوسطنجامعة كاليفورنيا الجنوبيةكلية جامعة جنوب كاليفورنيا للفنون السينمائية  [لغات أخرى]‏كلية بوسطن ال...

 

 

Маленький прокатный станок для ювелирных делВальцы со столиком для прокатки листов Прока́тный стан — комплекс оборудования, в котором происходит пластическая деформация металла при сдавливании его между вращающимися валками. В результате металлическая заготовка �...

UK ceremonial units Not to be confused with King's Guard. Yeomen of the Guard Royal Company of Archers Sovereign's Bodyguard is the name given to three ceremonial units in the United Kingdom who are tasked with guarding the Sovereign. These units are: His Majesty's Body Guard of the Honourable Corps of Gentlemen at Arms – formed 1509 King's Body Guard of the Yeomen of the Guard – formed 1485 Royal Company of Archers, the King's Body Guard for Scotland –...

 

 

This article possibly contains original research. Please improve it by verifying the claims made and adding inline citations. Statements consisting only of original research should be removed. (August 2021) (Learn how and when to remove this message) Part of a series onTrotskyism Concepts Anti-fascism Anti-Stalinism Bureaucratic collectivism Critique of political economy Cross-class alliance Deformed workers' state Degenerated workers' state Democratic centralism Economic planning Entryism Le...

 

 

American poet Barbara CarleBornPeshawarOccupationPoet, translator, critic, professor of ItalianLanguageEnglish, Italian, FrenchNationalityAmerican and FrenchEducationPhD. Columbia UniversityLiterary movementModernism, postmodernismNotable worksVestigia (2023)Don't Waste My Beauty/Non guastare la mia bellezza (2006)New Life/Nuova Vita (2006)Tangible Remains/Toccare quello che resta (2009)Sulle orme di Circe (2016)Gattizie (2018)Touching What Remains /Toccare quello che resta (2021)Notable awar...

Kelly Marie TranLahirKelly Marie Tran17 Januari 1989 (umur 35)San Diego, CaliforniaKebangsaanAmerika SerikatPekerjaanAktrisTahun aktif2011–sekarangDikenal atasRose Tico di Star Wars: The Last Jedi Kelly Marie Tran (lahir 17 Januari 1989) adalah aktris film Amerika Serikat. Ia memiliki peran di beberapa film pendek dan episode televisi. Ia dikenal sebagai pemeran Rose Tico dalam Star Wars: The Last Jedi, film kedelapan dalam seri Star Wars.[1] Kehidupan awal Kelly Marie Tr...

 

 

Baseball stadium in Scottsdale, Arizona Scottsdale StadiumScottsdale Stadium during San Francisco Giants spring training game in March 2012Location7408 E. Osborn RoadScottsdale, AZ 85251Coordinates33°29′18″N 111°55′16″W / 33.48833°N 111.92111°W / 33.48833; -111.92111OwnerCity of ScottsdaleCapacity12,000Field sizeLeft Field Line: 360’Right Field Line: 330’Center Field: 430’Outfield Fence Height 10’SurfaceGrassConstructionBroke groundApril 1991Built19...

 

 

Questa voce sull'argomento distretti del Perù è solo un abbozzo. Contribuisci a migliorarla secondo le convenzioni di Wikipedia. IparíadistrettoLocalizzazioneStato Perù Regione Ucayali ProvinciaCoronel Portillo AmministrazioneCapoluogoIparía Data di istituzione2 luglio 1943 TerritorioCoordinatedel capoluogo9°18′25.2″S 74°26′34.8″W9°18′25.2″S, 74°26′34.8″W (Iparía) Altitudine169 m s.l.m. Superficie8 029,59 km² Abitanti10 774 ...

Prime Minister of France (1876–1945) André TardieuTardieu in 1928Prime Minister of FranceIn office20 February 1932 – 3 June 1932PresidentPaul DoumerAlbert LebrunPreceded byPierre LavalSucceeded byÉdouard HerriotIn office2 March 1930 – 13 December 1930PresidentGaston DoumerguePreceded byCamille ChautempsSucceeded byThéodore SteegIn office2 November 1929 – 21 February 1930PresidentGaston DoumerguePreceded byAristide BriandSucceeded byCamille Chautemps Perso...

 

 

تربية بيئيةمعلومات عامةصنف فرعي من upbringing (en) علم التربية الموضوع الرئيس الحفاظ على البيئة تعديل - تعديل مصدري - تعديل ويكي بيانات ملصق المؤتمر السادس الأمريكي اللاتيني للتربية البيئية الذي إنعقد من 16 إلى 19 سبتمبر 2009 في مدينة سان كليمنتي ديل تويو في مقاطعة بوينس آيرس، التربي...