{"id":27193,"date":"2018-06-27T12:19:42","date_gmt":"2018-06-27T09:19:42","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=27193"},"modified":"2018-06-27T12:29:38","modified_gmt":"2018-06-27T09:29:38","slug":"her-yoldasi-yildiz-sanmayin-dusuk-kutleli-beyaz-cuceye-pulsar-yoldas","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2018\/06\/27\/her-yoldasi-yildiz-sanmayin-dusuk-kutleli-beyaz-cuceye-pulsar-yoldas","title":{"rendered":"Her yolda\u015f\u0131 y\u0131ld\u0131z sanmay\u0131n! D\u00fc\u015f\u00fck k\u00fctleli beyaz c\u00fcceye pulsar yolda\u015f!"},"content":{"rendered":"

Uluslararas\u0131 astronomlardan\u00a0olu\u015fan bir ekip\u00a0West Virginia, Green Bank’ta bulunan\u00a0Robert C. Byrd Green Bank Teleskobu’nu (GBT) kullanarak, d\u00fc\u015f\u00fck k\u00fctleli bir\u00a0sistemde\u00a0bulunan\u00a0beyaz c\u00fcceye e\u015flik ediyor olabilece\u011fini tahmin ettikleri yolda\u015f n\u00f6tron y\u0131ld\u0131z\u0131n\u0131 ararlarken\u00a0rastlant\u0131 eseri\u00a0bir\u00a0pulsar ke\u015ffettiler.<\/p>\n

\u00c7ok h\u0131zl\u0131 d\u00f6nen ve y\u00fcksek manyetik alanlara sahip olan\u00a0n\u00f6tron y\u0131ld\u0131zlar\u0131na pulsar ad\u0131 verilir. Bu \u0131\u015f\u0131n\u0131m, d\u00fczenli bir\u00a0periyodisiteye\u00a0sahiptir\u00a0ve genellikle radyo \u0131\u015f\u0131n\u0131m b\u00f6lgesinde k\u0131sa \u0131\u015f\u0131n parlamalar\u0131 ile tespit edilir. Pulsarlar, genel olarak\u00a0b\u00fcy\u00fck radyo teleskoplar\u00a0kullan\u0131larak bulunurlar. \u015eimdiye dek bu cisimlerden neredeyse binlercesi tespit edildi.<\/p>\n

Ge\u00e7ti\u011fimiz g\u00fcnlerde, Yunanistan’da Jeff J. Andrews of the Foundation for Research and Technology-Hellas’\u0131n \u00f6nderlik etti\u011fi bir grup ara\u015ft\u0131rmac\u0131 GBT teleskobu yard\u0131m\u0131yla radyo dalga boyunda g\u00f6zlemler yaparak \u00a0d\u00fc\u015f\u00fck k\u00fctleli beyaz c\u00fccelere e\u015flik eden n\u00f6tron y\u0131ld\u0131zlar\u0131n\u0131 bulmak \u00fczerine yo\u011funla\u015fm\u0131\u015flard\u0131. \u00c7ok d\u00fc\u015f\u00fck k\u00fctleli beyaz c\u00fccelerin kataloglanmas\u0131 \u00fczerine olan g\u00f6zlemsel projeleri, yak\u0131n zamanda olduk\u00e7a uzun periyoda sahip olan, tan\u0131mlanamayan bir pulsar ke\u015ffi ile sonu\u00e7land\u0131. Ke\u015ffedilen cisme PSR J0802-0955 kodu atand\u0131. \u00c7al\u0131\u015fmaya g\u00f6re, PSR J0802-0955 571 milisaniyelik bir periyoda sahip. Pulsar\u0131n, SDSS J080250.13-095549.8 ad\u0131yla bilinen 0.2 G\u00fcne\u015f k\u00fctlesine sahip beyaz c\u00fcce ile ayn\u0131 pozisyonda oldu\u011fu saptand\u0131. Ancak ara\u015ft\u0131rmac\u0131lar, ke\u015ffedilen bu yeni cismin izole bir n\u00f6tron y\u0131ld\u0131z\u0131 oldu\u011fu sonucuna vard\u0131lar. PSR J0802-0955’\u0131n olduk\u00e7a uzun olan at\u0131m periyodunu, radyo verisindeki radyal h\u0131z\u0131 de\u011fi\u015fimindeki yetersizlik ve GBT’nin gelen \u0131\u015f\u0131n demetini 340 MHz frekas\u0131nda g\u00f6zlemlenmesi dikkate alarak, neredeyse ayni uzakl\u0131k ve konumda olan SDSS J080250.13-095549.8 ile bu zamana dek hi\u00e7 ili\u015fkilendirilmemi\u015f oldu\u011funu g\u00f6sterdiler.<\/p>\n

Yazarlar\u0131n makalede belirtti\u011fine g\u00f6re: “PSR J0802-0955 de\u011fi\u015fmeyen at\u0131m periyotlar\u0131 g\u00f6stermekteydi. D\u00fc\u015f\u00fck k\u00fctleli beyaz c\u00fccelerin optik dalga boyundaki radyal h\u0131z e\u011frileri ele al\u0131p yorum yapt\u0131\u011f\u0131m\u0131zda bu cismin asl\u0131nda izole bir pulsar olabilece\u011fi sonucuna vard\u0131k.”<\/p>\n

Dolay\u0131s\u0131yla, PSR J0802-0955 \u00e7ok d\u00fc\u015f\u00fck k\u00fctleli beyaz c\u00fcceler katalo\u011funa tan\u0131mlanm\u0131\u015f ba\u015fka bir nesne olmu\u015f oldu.D\u00fc\u015f\u00fck k\u00fctleli beyaz c\u00fcceler evrenin yeterince ya\u015fl\u0131 olmamas\u0131ndan dolay\u0131 tek bir y\u0131ld\u0131z olarak bu \u015fekilde evrimle\u015femeyece\u011finden dolay\u0131 \u00e7o\u011funlukla \u00e7ift sistemlerde kar\u015f\u0131m\u0131za \u00e7\u0131kmaktad\u0131rlar. \u00c7al\u0131\u015fmalar, d\u00fc\u015f\u00fck k\u00fctleli beyaz c\u00fccelerin b\u00fcy\u00fck bir k\u0131sm\u0131n\u0131n beyaz c\u00fcce olan yolda\u015f y\u0131ld\u0131zlar; ufak bir k\u0131sm\u0131n\u0131n ise n\u00f6tron y\u0131ld\u0131z\u0131 yolda\u015f y\u0131ld\u0131zlar bar\u0131nd\u0131rabilece\u011fini g\u00f6steriyor.<\/p>\n","protected":false},"excerpt":{"rendered":"

Uluslararas\u0131 astronomlardan\u00a0olu\u015fan bir ekip\u00a0West Virginia, Green Bank’ta bulunan\u00a0Robert C. Byrd Green Bank Teleskobu’nu (GBT) kullanarak, d\u00fc\u015f\u00fck k\u00fctleli bir\u00a0sistemde\u00a0bulunan\u00a0beyaz c\u00fcceye e\u015flik ediyor olabilece\u011fini tahmin ettikleri yolda\u015f n\u00f6tron y\u0131ld\u0131z\u0131n\u0131 ararlarken\u00a0rastlant\u0131 eseri\u00a0bir\u00a0pulsar ke\u015ffettiler. \u00c7ok h\u0131zl\u0131 d\u00f6nen ve y\u00fcksek manyetik alanlara sahip olan\u00a0n\u00f6tron y\u0131ld\u0131zlar\u0131na pulsar ad\u0131 verilir. Bu \u0131\u015f\u0131n\u0131m, d\u00fczenli bir\u00a0periyodisiteye\u00a0sahiptir\u00a0ve genellikle radyo \u0131\u015f\u0131n\u0131m b\u00f6lgesinde k\u0131sa \u0131\u015f\u0131n parlamalar\u0131 ile […]<\/p>\n","protected":false},"author":812,"featured_media":27196,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,19,26,1],"tags":[860,3568,3566,993,2238,1883,3313,3567],"class_list":["post-27193","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomi","category-bilim-gundemi","category-fizik","category-genel","tag-beyaz-cuce","tag-cift-sistem","tag-dusuk-kutleli-beyaz-cuce","tag-manyetik-alan","tag-notron-yildizi","tag-pulsar","tag-radyo-dalgalari","tag-rolativistik-jet"],"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