{"id":49258,"date":"2021-03-21T11:23:15","date_gmt":"2021-03-21T08:23:15","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=49258"},"modified":"2021-03-21T11:23:45","modified_gmt":"2021-03-21T08:23:45","slug":"samanyolundaki-yillik-nova-patlamalari-hassas-sekilde-olculdu","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2021\/03\/21\/samanyolundaki-yillik-nova-patlamalari-hassas-sekilde-olculdu","title":{"rendered":"Samanyolu\u2019ndaki y\u0131ll\u0131k nova patlamalar\u0131 hassas \u015fekilde \u00f6l\u00e7\u00fcld\u00fc"},"content":{"rendered":"

S\u00f6n\u00fck y\u0131ld\u0131zlar\u0131n parlay\u0131p tekrar s\u00f6nene dek g\u00fcne\u015fimizden \u00e7ok daha fazla \u0131\u015f\u0131k yaymas\u0131na neden olan nova patlamalar\u0131n\u0131n Samanyolu\u2019ndaki s\u0131kl\u0131\u011f\u0131 g\u00f6kbilimciler taraf\u0131ndan ke\u015ffediliyor. Ancak galaksimiz o kadar b\u00fcy\u00fck ve tozlu ki, yeni elementlerin uzaya f\u0131rlat\u0131ld\u0131\u011f\u0131 bu t\u00fcr patlamalar\u0131n ne s\u0131kl\u0131kla meydana geldi\u011fi bilinmiyor.<\/p>\n

Patlamalar\u0131n y\u0131ld\u0131zlararas\u0131 tozlardan g\u00f6r\u00fcn\u00fcr \u0131\u015f\u0131\u011fa k\u0131yasla daha etkili bi\u00e7imde ge\u00e7en k\u0131z\u0131l\u00f6tesi spektrumunu inceleyen Caltech g\u00f6kbilimcisi Kishalay De ve \u00e7al\u0131\u015fma arkada\u015flar\u0131, bu patlamalar\u0131n ne s\u0131kl\u0131kla meydana geldi\u011fini tahmin ettiler. Nova oran\u0131n\u0131 bilmek, bu patlamalar\u0131n uzaya sa\u00e7aca\u011f\u0131 elementlerin miktar\u0131n\u0131 da belirlemek olaca\u011f\u0131ndan, galaksinin yap\u0131s\u0131 hakk\u0131nda \u00e7\u0131kar\u0131m yapabilmek a\u00e7\u0131s\u0131ndan son derece \u00f6nemlidir.<\/p>\n

Ekip, elde etti\u011fi y\u0131ll\u0131k nova miktar\u0131n\u0131, 13 hata pay\u0131yla 46 olarak arXiv.org adresinde raporlad\u0131. \u00d6nceki tahminler 10 ila 300 aras\u0131nda de\u011fi\u015fmekteydi.<\/p>\n

Nova patlamalar\u0131, birbiri etraf\u0131nda d\u00f6nen \u00e7ift y\u0131ld\u0131z sistemlerinde meydana gelir. Y\u0131ld\u0131zlardan biri D\u00fcnya boyutlar\u0131nda fakat G\u00fcne\u015f k\u00fctlesinde bir beyaz c\u00fccedir. E\u015flik\u00e7i y\u0131ld\u0131z\u0131ndan gaz kopard\u0131ktan sonra gaz\u0131n patlamas\u0131yla birlikte s\u00f6n\u00fck olan y\u0131ld\u0131z \u00e7ok y\u00fcksek miktarda parlamaya ba\u015flar. S\u00fcpernovalar\u0131n aksine nova patlamalar\u0131 y\u0131ld\u0131z\u0131 yok etmez.<\/p>\n

Kaliforniya\u2019daki Palomar G\u00f6zlemevi\u2019nden 17 ay boyunca g\u00f6ky\u00fcz\u00fcn\u00fc tarayan De ve ekibi, 12 nova patlamas\u0131 tespit etti ve g\u00f6zden ka\u00e7\u0131r\u0131lan patlamalar\u0131 da hesaba katarak, y\u0131ll\u0131k nova oran\u0131n\u0131 hesaplad\u0131lar. Bulduklar\u0131 say\u0131lar, San Diego \u00dcniversitesi\u2019nden Allen Shafter\u2019in d\u00f6rt sene \u00f6ncesinde 27 ila 81 aras\u0131nda buldu\u011fu orana yak\u0131n ancak \u00e7ok daha hassas bir nova oran\u0131 ortaya koydu.<\/p>\n

K\u0131z\u0131l\u00f6tesi dalga boylar\u0131n\u0131n toz ile g\u00f6lgelenen uzak patlamalar\u0131 g\u00f6zlemlemek i\u00e7in ideal oldu\u011funu vurgulayan Louisiana Eyalet \u00dcniversitesi’nden astrofizik\u00e7i Bradley Schaefer, “Harika bir i\u015f \u00e7\u0131kar\u0131yorlar” diyerek “Ger\u00e7ekten \u00e7ok iyi verilere sahipler” diye ekliyor.<\/p>\n

Daha hassas nova oranlar\u0131, galaksimizin kimyasal kompozisyonunun hangi miktarlarda de\u011fi\u015fti\u011fine \u0131\u015f\u0131k tutmas\u0131 a\u00e7\u0131s\u0131ndan olduk\u00e7a de\u011ferlidir. Nova patlamalar\u0131n\u0131n ortaya \u00e7\u0131kard\u0131\u011f\u0131 element zenginli\u011fi s\u00fcpernova patlamalar\u0131 ile rekabet edemeyecek kadar olsa da, s\u00fcpernova patlamalar\u0131 nadir olarak ger\u00e7ekle\u015fir. Arizona Eyalet \u00dcniversitesi g\u00f6kbilimcisi Sumner Starrfield, 50 civar\u0131ndaki bir y\u0131ll\u0131k nova oran\u0131n\u0131n, Lityum-7, Karbon-13, Azot-15 ve Oksijen-17 gibi yery\u00fcz\u00fcndeki baz\u0131 nadir izotoplar\u0131n k\u0131smen veya \u00e7o\u011funlukla nova kaynakl\u0131 olabilece\u011fine i\u015faret ediyor: Ek n\u00fckleer reaksiyonlar yok etmeden \u00f6nce, patlamalar bu izotoplar\u0131 uzaya s\u00fcp\u00fcr\u00fcyor ve b\u00f6ylece gezegenler i\u00e7in malzeme sa\u011flan\u0131yor.<\/p>\n

Kaynak:<\/strong> https:\/\/www.sciencenews.org\/article\/number-milky-way-nova-explosions-per-year-pinned-down<\/p>\n","protected":false},"excerpt":{"rendered":"

S\u00f6n\u00fck y\u0131ld\u0131zlar\u0131n parlay\u0131p tekrar s\u00f6nene dek g\u00fcne\u015fimizden \u00e7ok daha fazla \u0131\u015f\u0131k yaymas\u0131na neden olan nova patlamalar\u0131n\u0131n Samanyolu\u2019ndaki s\u0131kl\u0131\u011f\u0131 g\u00f6kbilimciler taraf\u0131ndan ke\u015ffediliyor. Ancak galaksimiz o kadar b\u00fcy\u00fck ve tozlu ki, yeni elementlerin uzaya f\u0131rlat\u0131ld\u0131\u011f\u0131 bu t\u00fcr patlamalar\u0131n ne s\u0131kl\u0131kla meydana geldi\u011fi bilinmiyor. Patlamalar\u0131n y\u0131ld\u0131zlararas\u0131 tozlardan g\u00f6r\u00fcn\u00fcr \u0131\u015f\u0131\u011fa k\u0131yasla daha etkili bi\u00e7imde ge\u00e7en k\u0131z\u0131l\u00f6tesi spektrumunu inceleyen Caltech […]<\/p>\n","protected":false},"author":634,"featured_media":49259,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,19],"tags":[861,7453,1748,2300],"class_list":["post-49258","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomi","category-bilim-gundemi","tag-gezegen","tag-nova-patlamasi","tag-samanyolu","tag-supernova"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t