{"id":59407,"date":"2019-03-16T15:46:10","date_gmt":"2019-03-16T13:46:10","guid":{"rendered":"https:\/\/osr.org\/?p=59407"},"modified":"2024-05-24T17:33:54","modified_gmt":"2024-05-24T15:33:54","slug":"bilim-insanlari-yildiz-kumelerini-inceleyerek-samanyolu-galaksisindeki-yercekimini-anlamaya-calisacak","status":"publish","type":"post","link":"https:\/\/osr.org\/tr\/blog\/astronomi\/bilim-insanlari-yildiz-kumelerini-inceleyerek-samanyolu-galaksisindeki-yercekimini-anlamaya-calisacak\/","title":{"rendered":"Y\u0131ld\u0131z K\u00fcmeleri ve Samanyolu Galaksisi’ndeki Yer\u00e7ekimi"},"content":{"rendered":"

G\u00fcney yar\u0131m k\u00fcrede ya\u015fayan insanlar, yeni ke\u015ffedilen ve Samanyolu Galaksisi’nde y\u00fcz milyonlarca y\u0131ld\u0131r hareket eden bir kozmik nehrin fark\u0131na varm\u0131\u015f olabilir.<\/p>\n

Astronomlar, yeni ke\u015ffedilen bu devasa y\u0131ld\u0131z k\u00fcmelerinin G\u00fcne\u015f Sistemi\u2019mize fazlas\u0131yla yak\u0131n olarak ge\u00e7ti\u011fini belirtti. En az 4.000 adet y\u0131ld\u0131z\u0131 i\u00e7erisinde bar\u0131nd\u0131ran bu k\u00fcme, geceleri g\u00f6ky\u00fcz\u00fcnde bir nehri and\u0131racak \u015fekilde t\u00fcm semay\u0131 kapl\u0131yor.<\/p>\n

Astronomi ve Astrofizik dergisinde bug\u00fcn yay\u0131nlanan ara\u015ft\u0131rman\u0131n ba\u015fyazar\u0131 Stefan Meingast \u201cGalaktik disk i\u00e7erisinde bulunan bir\u00e7ok y\u0131ld\u0131z k\u00fcmesi, do\u011fumundan k\u0131sa bir s\u00fcre sonra y\u0131ld\u0131zlar\u0131 bir arada tutacak yeterli yer\u00e7ekimsel potansiyele sahip olmad\u0131\u011f\u0131 i\u00e7in da\u011f\u0131l\u0131yor. Ba\u015fka bir deyi\u015fle onlar\u0131 bir b\u00fct\u00fcn halinde tutmaya yetecek kadar yap\u0131\u015ft\u0131r\u0131c\u0131ya sahip de\u011filler\u201d dedi.Viyana \u00dcniversitesi ve Harvard \u00dcniversitesi\u2019nde bulunan ara\u015ft\u0131rmac\u0131lar, bahsi ge\u00e7en bu y\u0131ld\u0131z ak\u0131\u015f\u0131n\u0131 Avrupa\u2019n\u0131n Gaia uzay arac\u0131ndan al\u0131nan verileri kullan\u0131p 200 adet y\u0131ld\u0131z\u0131n 3B hareketlerini haritalayarak ke\u015ffetti.<\/p>\n

Ara\u015ft\u0131rmac\u0131lar bu y\u0131ld\u0131z nehri \u00fczerinde ara\u015ft\u0131rmalar d\u00fczenleyerek Samanyolu Galaksisi’nin yer\u00e7ekimsel kuvveti hakk\u0131nda daha iyi bir bilgiye sahip olacaklar\u0131n\u0131 d\u00fc\u015f\u00fcn\u00fcyor.<\/p>\n

Y\u0131ld\u0131z k\u00fcmeleri<\/span><\/h2>\n

Y\u0131ld\u0131z k\u00fcmeleri veya y\u0131ld\u0131z bulutlar\u0131 gruplar halinde bir araya gelmi\u015f y\u0131ld\u0131zlar\u0131n adland\u0131r\u0131lma terimi.<\/p>\n

Y\u0131ld\u0131z k\u00fcmelerinin iki tipi ay\u0131rt edilebilir: k\u00fcresel k\u00fcmeler k\u00fctle\u00e7ekim kuvveti ile ba\u011fl\u0131 y\u00fczlerce ya da binlerce ya\u015fl\u0131 y\u0131ld\u0131zdan olu\u015fan s\u0131k\u0131\u015f\u0131k gruplar halindedir. A\u00e7\u0131k k\u00fcmeler, y\u0131ld\u0131zlar\u0131n daha gev\u015fek k\u00fcmelenmi\u015f gruplar halindedir. Genellikle birka\u00e7 y\u00fczden daha az y\u0131ld\u0131z i\u00e7erir. Genellikle \u00e7ok gen\u00e7tirler. A\u00e7\u0131k k\u00fcmeler galakside dola\u015f\u0131rken, dev molek\u00fcler bulutlar\u0131n \u00e7ekim etkisiyle zamanla bozulur. Ancak k\u00fcmenin \u00fcyeleri art\u0131k k\u00fctle\u00e7ekimsel olarak ba\u011fl\u0131 olmasa da uzayda ayn\u0131 y\u00f6nde hareket etmeye devam edecektir. Daha sonra, hareket eden bir grup olarak ifade edilen y\u0131ld\u0131z birli\u011fi olarak bilinmektedir. Y\u0131ld\u0131z k\u00fcmeleri \u00e7\u0131plak g\u00f6zle g\u00f6r\u00fclebilir. Bunlar Yedi K\u0131z Karde\u015f, Bo\u011fa ve Messier 44\u2019d\u00fcr.<\/p>\n

K\u00fcresel y\u0131ld\u0131z k\u00fcmeleri 10,000\u2019den birka\u00e7 milyon y\u0131ld\u0131z\u0131n yakla\u015f\u0131k olarak k\u00fcresel bir yap\u0131ya b\u00fcr\u00fcnm\u00fc\u015f halidir. 10 ila 30 \u0131\u015f\u0131k y\u0131l\u0131 mesafesindeki bir b\u00f6lge i\u00e7indedirler. Genel olarak \u00e7ok ya\u015fl\u0131 Pop\u00fclasyon II y\u0131ld\u0131zlar\u0131n\u0131 i\u00e7erirler. Evrenin kendisinden sadece birka\u00e7 y\u00fcz milyon gen\u00e7tirler. \u00c7o\u011funlukla sar\u0131 ve k\u0131rm\u0131z\u0131 y\u0131ld\u0131zlard\u0131r. K\u00fctleleri iki g\u00fcne\u015f k\u00fctlesinden daha azd\u0131r. Bu t\u00fcr y\u0131ld\u0131zlar k\u00fcmeler i\u00e7inde bask\u0131nd\u0131r \u00e7\u00fcnk\u00fc daha s\u0131cak ve \u00e7ok daha fazla k\u00fctleye sahip y\u0131ld\u0131zlar s\u00fcpernova olarak patlam\u0131\u015flard\u0131r veya sonradan beyaz c\u00fcce olmak \u00fczere gezegenimsi bulutsuya do\u011fru evrimle\u015fmi\u015flerdir. Birka\u00e7 nadir mavi y\u0131ld\u0131z da k\u00fcresel k\u00fcmelerde bulunur. Kendi yo\u011fun i\u00e7 b\u00f6lgelerinde y\u0131ld\u0131z birle\u015fmeleri sonucu olu\u015ftu\u011fu d\u00fc\u015f\u00fcn\u00fcl\u00fcyor. Bu y\u0131ld\u0131zlar mavi ba\u015f\u0131bo\u015flar olarak da bilinir.<\/p>\n

K\u00fcresel y\u0131ld\u0131z k\u00fcmeleri<\/span><\/h2>\n

Bizim galaksimizde, k\u00fcresel y\u0131ld\u0131z k\u00fcmeleri yakla\u015f\u0131k olarak k\u00fcresel bi\u00e7imde galaksi halesinde, galaksi merkez eraf\u0131nda, olduk\u00e7a eliptik y\u00f6r\u00fcngelere da\u011f\u0131t\u0131lm\u0131\u015flard\u0131r. 1917 y\u0131l\u0131nda, astronom Harlow Shapley k\u00fcresel k\u00fcmelerin da\u011f\u0131l\u0131m\u0131na bakarak G\u00fcne\u015f\u2019in galaksi merkezine olan mesafesini tahmin etmeyi ba\u015fard\u0131. Daha \u00f6nce, Samanyolu i\u00e7inde G\u00fcne\u015f’in konumu iyi belirlenememi\u015fti.<\/p>\n

Yak\u0131n zamana kadar, k\u00fcresel y\u0131ld\u0131z k\u00fcmeleri astronomide b\u00fcy\u00fck bir gizeme neden oldu. Y\u0131ld\u0131z evriminin teorilerinin, k\u00fcresel y\u0131ld\u0131z k\u00fcmeleri aras\u0131ndaki en ya\u015fl\u0131 \u00fcyeleri i\u00e7in verdi\u011fi ya\u015f evrenin tahmin edilen ya\u015f\u0131ndan daha b\u00fcy\u00fck. Ancak, Hipparcos uydusu kullan\u0131larak k\u00fcresel y\u0131ld\u0131z k\u00fcmelerinin mesafesini \u00f6l\u00e7mek i\u00e7in yap\u0131lan geli\u015fmi\u015f \u00f6l\u00e7\u00fcmler ve Hubble sabitinin giderek artan hassasiyetteki do\u011fru \u00f6l\u00e7\u00fcmleri paradoksu yeniden \u00e7\u00f6zd\u00fc. Evrene yakla\u015f\u0131k 13 milyar y\u0131l ya\u015f verdi ve en ya\u015fl\u0131 y\u0131ld\u0131zlara birka\u00e7 y\u00fcz milyon y\u0131l ya\u015f verdi.<\/p>\n

B\u00f6yle Samanyolu g\u00f6k adas\u0131ndaki Westerlund 1 gibi S\u00fcper y\u0131ld\u0131z k\u00fcmeleri k\u00fcresel y\u0131ld\u0131z k\u00fcmelerinin habercisi olabilir.Bizim galaksimiz yakla\u015f\u0131k 150 k\u00fcresel y\u0131ld\u0131z k\u00fcmesine sahiptir. Bunlardan baz\u0131lar\u0131 Samanyolu g\u00f6k adas\u0131 taraf\u0131ndan bozulmu\u015f k\u00fc\u00e7\u00fck galaksiler taraf\u0131ndan yakalanm\u0131\u015f olabilir. K\u00fcresel y\u0131ld\u0131z k\u00fcmesi M79 i\u00e7in durumun b\u00f6yle oldu\u011fu g\u00f6r\u00fcl\u00fcyor. Baz\u0131 galaksiler k\u00fcresel y\u0131ld\u0131z k\u00fcmeleri a\u00e7\u0131s\u0131ndan \u00e7ok zengindir. \u00d6rne\u011fin dev eliptik g\u00f6kada M87 binin \u00fczerinde k\u00fcresel y\u0131ld\u0131z k\u00fcmesi i\u00e7erir.<\/p>\n

K\u00fcresel y\u0131ld\u0131z k\u00fcmelerinden en parlak olan birka\u00e7 tanesi \u00e7\u0131plak g\u00f6zle g\u00f6r\u00fclebilir. Omega Centauri en parlak olanlar\u0131ndan biridir. Antik \u00e7a\u011flardan beri bilinmektedir ve teleskobik ya\u015f\u0131ndan \u00f6nce bir y\u0131ld\u0131z olarak kataloglanm\u0131\u015ft\u0131r. Kuzey yar\u0131mk\u00fcredeki en iyi bilinen k\u00fcresel y\u0131ld\u0131z k\u00fcmesi M13\u2019t\u00fcr (al\u00e7akg\u00f6n\u00fcll\u00fcl\u00fckle Herk\u00fcl\u2019deki B\u00fcy\u00fck K\u00fcresel Y\u0131ld\u0131z K\u00fcmesi olarak adland\u0131r\u0131l\u0131r).<\/p>\n","protected":false},"excerpt":{"rendered":"

G\u00fcney yar\u0131m k\u00fcrede ya\u015fayan insanlar, yeni ke\u015ffedilen ve Samanyolu Galaksisi’nde y\u00fcz milyonlarca y\u0131ld\u0131r hareket eden bir kozmik nehrin fark\u0131na varm\u0131\u015f olabilir. Astronomlar, yeni ke\u015ffedilen bu devasa y\u0131ld\u0131z k\u00fcmelerinin G\u00fcne\u015f Sistemi\u2019mize fazlas\u0131yla yak\u0131n olarak ge\u00e7ti\u011fini belirtti. En az 4.000 adet y\u0131ld\u0131z\u0131 i\u00e7erisinde bar\u0131nd\u0131ran bu k\u00fcme, geceleri g\u00f6ky\u00fcz\u00fcnde bir nehri and\u0131racak \u015fekilde t\u00fcm semay\u0131 kapl\u0131yor. Astronomi ve […]<\/p>\n","protected":false},"author":23,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[506],"tags":[],"class_list":["post-59407","post","type-post","status-publish","format-standard","hentry","category-astronomi"],"acf":[],"yoast_head":"\nY\u0131ld\u0131z K\u00fcmeleri ve Samanyolu Galaksisi'ndeki Yer\u00e7ekimi - Online Star Register<\/title>\n<meta name=\"description\" content=\"Samanyolu Galaksisi'nin etraf\u0131nda dola\u015fan y\u0131ld\u0131z k\u00fcmeleri arac\u0131l\u0131\u011f\u0131yla galaksinin yer\u00e7ekimsel potansiyelinin incelenebilecek.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/osr.org\/tr\/blog\/astronomi\/bilim-insanlari-yildiz-kumelerini-inceleyerek-samanyolu-galaksisindeki-yercekimini-anlamaya-calisacak\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Y\u0131ld\u0131z K\u00fcmeleri ve Samanyolu Galaksisi'ndeki Yer\u00e7ekimi - 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