{"id":45506,"date":"2020-07-11T18:29:49","date_gmt":"2020-07-11T15:29:49","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=45506"},"modified":"2020-07-11T18:31:59","modified_gmt":"2020-07-11T15:31:59","slug":"karbonun-kokeni-hakkinda-yeni-gorusler","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2020\/07\/11\/karbonun-kokeni-hakkinda-yeni-gorusler","title":{"rendered":"Karbonun k\u00f6keni hakk\u0131nda yeni g\u00f6r\u00fc\u015fler…"},"content":{"rendered":"

Evrendeki her bir karbon atomu, \u00fc\u00e7 helyum \u00e7ekirde\u011finin kayna\u015fmas\u0131yla olu\u015ftu. Bu olu\u015fumda y\u0131ld\u0131zlar\u0131n rol\u00fc b\u00fcy\u00fckt\u00fc, ancak hangi t\u00fcr y\u0131ld\u0131zlar\u0131n birincil kaynak oldu\u011fu konusunda astrofizik\u00e7iler aras\u0131ndaki tart\u0131\u015fma s\u00fcr\u00fcyordu. Baz\u0131 biliminsanlar\u0131 karbonun kayna\u011f\u0131 olarak beyaz c\u00fcceleri i\u015faret ederken, baz\u0131lar\u0131 b\u00fcy\u00fck k\u00fctleli y\u0131ld\u0131zlar\u0131n karbonun olu\u015fumunda etkili oldu\u011funu d\u00fc\u015f\u00fcn\u00fcyordu.<\/p>\n

Nature Astronomy<\/em> dergisinde yay\u0131nlanan yeni \u00e7al\u0131\u015fmada Padova \u00dcniversitesi\u2019nden Paola Marigo y\u00fcr\u00fct\u00fcc\u00fcl\u00fc\u011f\u00fcndeki ekip karbonun k\u00f6kenini belirlemeye odakland\u0131. Hawaii\u2019deki WM Keck G\u00f6zlemevi’nden gelen verileri kullanarak Samanyolu’nun a\u00e7\u0131k y\u0131ld\u0131z k\u00fcmelerine ait beyaz c\u00fcceleri analiz ettiler. K\u00fctle \u00f6l\u00e7\u00fcmleri yap\u0131ld\u0131 ve y\u0131ld\u0131z evrimine ili\u015fkin teoriden yararlanarak y\u0131ld\u0131zlar\u0131n olu\u015fum k\u00fctlelerini hesaplad\u0131lar. \u201cBa\u015flang\u0131\u00e7tan sona k\u00fctle ili\u015fkisi\u201d astrofizikte kullan\u0131lan bir y\u00f6ntemdir. Genelde, y\u0131ld\u0131zlar olu\u015ftu\u011funda ne kadar b\u00fcy\u00fck olursa, (beyaz c\u00fcce) \u00f6l\u00fcm\u00fcnde de ancak o kadar b\u00fcy\u00fck olabilir. Bununla birlikte, yeni ke\u015ffedilen beyaz c\u00fccelerin analizi, k\u00fctlelerin beklenenden daha b\u00fcy\u00fck oldu\u011funu ortaya koydu. Marigo, \u201c\u0130lk-son k\u00fctle ili\u015fkisindeki bu sapmay\u0131 Samanyolu’nda d\u00fc\u015f\u00fck k\u00fctleli y\u0131ld\u0131zlar taraf\u0131ndan yap\u0131lan karbon sentezinin imzas\u0131 olarak yorumluyoruz\u201d a\u00e7\u0131klamalar\u0131nda bulundu.<\/p>\n

Ara\u015ft\u0131rmac\u0131lara g\u00f6re, G\u00fcne\u015f\u2019in iki kat\u0131 k\u00fctleye sahip y\u0131ld\u0131zlar hayatlar\u0131n\u0131n son evrelerinde s\u0131cak i\u00e7 yap\u0131lar\u0131nda yeni karbon atomlar\u0131 \u00fcretti ve karbon atomlar\u0131 zamanla y\u00fczeye ta\u015f\u0131nd\u0131, ard\u0131ndan hafif y\u0131ld\u0131z r\u00fczg\u00e2rlar\u0131 ile y\u0131ld\u0131zlararas\u0131 ortama yay\u0131ld\u0131. Y\u0131ld\u0131zlar\u0131n ayr\u0131nt\u0131l\u0131 modelleri bu yay\u0131lman\u0131n (karbon a\u00e7\u0131s\u0131ndan zengin d\u0131\u015f mantonun soyulmas\u0131n\u0131n) beyaz c\u00fccelerin kitlesel olarak kayda de\u011fer bir \u015fekilde b\u00fcy\u00fcmesine izin verecek kadar yava\u015f ger\u00e7ekle\u015fti\u011fini g\u00f6stermektedir.<\/p>\n

\u00c7al\u0131\u015fma, g\u00fcne\u015fin k\u00fctlesinden iki kat daha b\u00fcy\u00fck y\u0131ld\u0131zlar\u0131n karbonun yay\u0131lmas\u0131na katk\u0131da bulundu\u011fu sonucuna var\u0131rken, g\u00fcne\u015f k\u00fctlesinin 1.5 kat\u0131ndan daha az k\u00fctleye sahip olan y\u0131ld\u0131zlar\u0131n bu sonucu vermedi\u011fini ortaya \u00e7\u0131kard\u0131. Ba\u015fka bir deyi\u015fle g\u00fcne\u015f k\u00fctlesinin 1.5 kat\u0131, bir y\u0131ld\u0131z\u0131n karbonla zenginle\u015ftirilmi\u015f k\u00fclleri yaymas\u0131 i\u00e7in minimum k\u00fctledir.<\/p>\n

Warwick \u00dcniversitesi’nden Pier-Emmanuel Tremblay, \u201c\u0130lk-son k\u00fctle ili\u015fkisi ayn\u0131 zamanda s\u00fcpernova i\u00e7in alt k\u00fctle s\u0131n\u0131r\u0131n\u0131, b\u00fcy\u00fck mesafelerde g\u00f6r\u00fclen devasa patlamalar\u0131 ve Evreni anlamak i\u00e7in ger\u00e7ekten \u00f6nemli olan bir analiz y\u00f6ntemidir\u201d a\u00e7\u0131klamas\u0131nda bulundu.<\/p>\n

Kaynak:<\/strong> https:\/\/cosmosmagazine.com\/space\/astrophysics\/new-views-on-the-origins-of-carbon\/<\/p>\n","protected":false},"excerpt":{"rendered":"

Evrendeki her bir karbon atomu, \u00fc\u00e7 helyum \u00e7ekirde\u011finin kayna\u015fmas\u0131yla olu\u015ftu. Bu olu\u015fumda y\u0131ld\u0131zlar\u0131n rol\u00fc b\u00fcy\u00fckt\u00fc, ancak hangi t\u00fcr y\u0131ld\u0131zlar\u0131n birincil kaynak oldu\u011fu konusunda astrofizik\u00e7iler aras\u0131ndaki tart\u0131\u015fma s\u00fcr\u00fcyordu. Baz\u0131 biliminsanlar\u0131 karbonun kayna\u011f\u0131 olarak beyaz c\u00fcceleri i\u015faret ederken, baz\u0131lar\u0131 b\u00fcy\u00fck k\u00fctleli y\u0131ld\u0131zlar\u0131n karbonun olu\u015fumunda etkili oldu\u011funu d\u00fc\u015f\u00fcn\u00fcyordu. Nature Astronomy dergisinde yay\u0131nlanan yeni \u00e7al\u0131\u015fmada Padova \u00dcniversitesi\u2019nden Paola Marigo […]<\/p>\n","protected":false},"author":1390,"featured_media":45507,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19],"tags":[860,657,795,2299,1689,1780],"class_list":["post-45506","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bilim-gundemi","tag-beyaz-cuce","tag-evren","tag-gunes","tag-karbon","tag-koken","tag-yildiz"],"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