Type IA Supernovae
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en. A supernova is one way that a star can end its life, exploding in a display of grandiose fireworks. One family of supernovae, called Type Ia supernovae, are of particular interest in cosmology as they can be used as standard candles to measure distances in the Universe and so can be used to calibrate the accelerating expansion that is driven by dark energy. One defining characteristic of Type Ia supernovae is the lack of hydrogen in their spectrum. Yet hydrogen is the most common chemical element in the Universe. Such supernovae most likely arise in systems composed of two stars, one of them being the end product of the life of sun-like stars, or white dwarfs. When such white dwarfs, acting as stellar vampires that suck matter from their companion, become heavier than a given limit, they become unstable and explode. Video credit: ESO Original file downloaded from: http://www.eso.org/gallery/v/Videos/Stars/vid-43b-09_FLASH.flv.html tr. Üstnovalar, gösterişli bir patlama eşliğinde bir yıldızın ömrünü tamamlayış şekillerinden biridir. Üstnovalar çeşitlidirler ve bunlardan Ia türündekilerevrenbiliminde gökadakaların arasındaki uzaklıkların ölçülmesine ve cisimlerin birbirlerinden karanlık enerji sayesinde hangi oranlarda uzaklaştıklarının anlaşılmasına yardımcı olurlar. Ia türü üstnovaların en belirgin özelliklerinden biri elde edilen tayflarda hidrojen çizgilerinin bulunmuyor olmasıdır ki evrendeki en bol bulunan kimyasal element hidrojendir. Bu türdeki üstnovalar genelde ikili yıldız sistemlerinde görülür. Güneş benzeri bir yıldızın ömrünü tamamlayıp bir beyaz cüce türündeki çok yoğun ve küçük bir yıldıza dönüşür. Bu beyaz cüce yüksek güçlü manyetik alan ve çekim gücü sayesinde komşusu olan diğer yıldızdan bir vampir gibi sürekli madde emerek gittikçe ağırlaşır ve belirli bir sınırdan sonra yoğunluğu altında kararsız hale gelir ve patlar... Video kaynağı: ESO Dosyanın indirildiği bağlantı adresi: http://www.eso.org/gallery/v/Videos/Stars/vid-43b-09_FLASH.flv.html
Comments
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Sweet video!!!!!
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It was very interressant
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Technically, there is no sound :/
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in this type of supernova 1a, does the white dwarf and the star it gets matter of get destroyed in the explosion ?
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cool!
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What happen with the companion star? escaped the system?
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Thanks I have a bloody astrophysics test today. I should probably be studying though not on YouTube
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Gratulálok a Magyar csillagászat egyik legnagyobb felfedezőinek! Büszke vagyok rájuk.
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Recent work seems to refute this. A "killer SN" needs to be within a few tens of light years. Search for "supernova danger Brian fields" (He has worked on this subject.)
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@rottencranberry yes the other star survive only lost the serupefial area
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PTF11kly Super Nova IA in m101
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@yoonoose I was wondering, as the white dwarf is exploding, it brightens, dims and THEN explodes. Why is there that dip in brightness?
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IK Pegasi is only 150 LY from us and this will most likely happen when the primary star goes red giant. We need to be 3000 ly or farther to be safe
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@yoonoose Thank you, i't makes much more sense now. There is a whole universe out there you know... Best regards.
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What happened to the other star? Could it survive?
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Which caused which?
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