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FG Sagittae is a supergiant star in the constellation Sagitta at a distance of 4000 light-years. When first noted in 1943, it was identified to be a variable star, and it was found to be a hot, blue star of stellar spectral type B in 1955. Since then it has expanded and cooled, becoming a yellow G-type star by 1991, and then further cooling to become an orange K-type star. It started to pulsate when becoming an A-type star with a period of 15 days. This period later increased to over 100 days. FG Sagittae is the central star of the planetary nebula Henize 1-5.

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rdfs:label
  • FG Sagittae (es)
  • FG Sagittae (en)
  • FG Sagittae (it)
  • FG Sagittae (fr)
  • や座FG星 (ja)
  • FG Стрелы (ru)
  • 天箭座FG (zh)
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  • FG Sagittae (FG Sge)​ es una estrella variable de características excepcionales situada en la constelación de Sagitta, la flecha.De acuerdo a la paralaje obtenida por el satélite Hipparcos (5,38 ± 1,77 milisegundos de arco),​ se encuentra a 606 años luz del Sistema Solar. (es)
  • や座FG星(やざえふじーせい)はや座にある変光星で、学名はFG Sagittae(略称はFG Sge)。 (ja)
  • 天箭座FG位於天箭座,是一顆超巨星的恆星,距離地球大約8,000光年。它在1943年第一次被注意到,因為它是一顆變星,並且它的光譜在1955年被登錄為B4leq(藍色)。自那時以來,它在1911年已經擴大和紅化成為G(黃色),然後再轉換成K(橙色)。在登錄光譜為B4leg不久後,天箭座FG不久就變成A型星,並是週期15天的脈動變星,而現在週期已增加至超過100天。 天箭座FG是行星狀星雲Henize 1-5的中心恆星。. 自1992年以來,這顆星的光度呈現衰減和回復,類似北冕座R型變星,這種行為強調這類恆星是缺乏氫的典型。 它被建議是經歷了後期熱脈衝(late thermal pulse,LTP)的氦融合後,離開了漸近巨星分支(AGB),朝向白矮星最熱終端的冷卻軌跡。這種熱脈衝被認為是老年恆星,在短時間內,行為就像AGB的再一次復活。 (zh)
  • FG Sagittae is a supergiant star in the constellation Sagitta at a distance of 4000 light-years. When first noted in 1943, it was identified to be a variable star, and it was found to be a hot, blue star of stellar spectral type B in 1955. Since then it has expanded and cooled, becoming a yellow G-type star by 1991, and then further cooling to become an orange K-type star. It started to pulsate when becoming an A-type star with a period of 15 days. This period later increased to over 100 days. FG Sagittae is the central star of the planetary nebula Henize 1-5. (en)
  • FG Sagittae Autres désignations HIP 99527 ; FG Sge ; AN 377.1943 ; Hen 1-5 ; 2MASS J20115606+2020044 FG Sagittae est une étoile supergéante de la constellation de la Flèche, située à une distance d’environ 4 500 années-lumière (intervalle de confiance : 1,229 - 1,534 kpc). Elle a été identifiée pour la première fois comme étoile variable en 1943, et des observations ultérieures l’ont classée en étoile chaude et bleue de type spectral B en 1955. Depuis lors, elle s'est agrandie et refroidie, devenant une étoile jaune de type G en 1991, puis s'est encore refroidie pour devenir une étoile orange de type K. Elle est devenue une étoile pulsante de type A avec une période de 15 jours. Cette période est ensuite passée à plus de 100 jours. (fr)
  • FG Sagittae (FG Sge) è una stella variabile visibile in direzione della costellazione della Freccia; dista circa 8000 al dalla Terra. FG Sagittae è situata al centro di una nebulosità nota come Henize 1-5. Sin dal 1992 la stella ha manifestato riduzioni e successivi aumenti di luminosità simili a quelli caratteristici delle variabili R Coronae Borealis; tale comportamento sarebbe da attribuirsi alla penuria di idrogeno tipica di questa classe di stelle evolute. (it)
  • FG Стрелы — сверхгигант в созвездии Стрелы на расстоянии 8000 световых лет. В момент первого обнаружения в 1943 году звезда считалась переменной, спектральный класс был указан как B4Ieq (синий) в 1955 году. С тех пор звезда расширилась, спектральный класс B изменился на класс G (жёлтый) в 1991 году, и затем на K (оранжевый). FG Стрелы стала демонстрировать признаки пульсации, становясь звездой спектрального класса A (спустя малое время после того, как звезде был присвоен класс B4Ieq), с периодом 15 дней, в настоящее время период возрос до более чем 100 дней. (ru)
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