Boğa (yıldız kümesi)

Boğa Kümesi
Boğa Kümesi
Gözlem verisi (Dönem J2000)
TakımyıldızBoğa
Sağ açıklık (α)04sa 26,9d [1]
Dik açıklık (δ)+15° 52′[1]
TürII,3,m
Açısal boyut ()330′
Görünür büyüklük (V)+0,5
Yıldız sayısı300-400
Özellikler
Uzaklık151 Iy (46,34 pc)
Kütle (m)400 M☉
Yarıçap (r)10 Iy (çekirdek yarıçapı)
Yaş625 milyon yıl
Katalog belirtmeleri
Melotte 25, Collinder 50, OCl 456.0, C 0424+157, Caldwell 41
  Wikimedia Commons'ta ilgili ortam
Ayrıca bakınız: Açık yıldız kümesi, Liste

Boğa kümesi, (ayrıca Hyades veya Öküz Kümesi olarak da bilinir) Boğa takımyıldızı yönünde bulunan bir açık yıldız kümesi.

Güneş sistemi'ne en yakın açık küme olması yanı sıra en iyi incelenmiş olan yıldız kümesidir. Yaklaşık olarak 151 ışık yılı uzaklıkta olan küme; yaşı, kökeni ve kimyasal içeriği aynı olan 300 ile 400 arası yıldızdan oluşur.[2][3] Boğa takımyıldızı içinde parlak kırmızı dev Aldebaran ile birlikte "V" şeklini oluşturur. Aldebaran, Arapça "takip eden" veya "izleyen" demektir. Bu konumda "izlenen", Boğa Kümesi'dir. Ancak, Aldebaran sadece aynı görüş hattında bulunan bir yıldızdır ve kümeyle bir ilgisi yoktur.

Kümenin dört parlak üyesi, hayatlarına masif A-tipi yıldızlar olarak başlamış kırmızı devlerdir.[4] Tümü, birbirlerinden birkaç ışık yılı uzaklıkta bulunmaktadır. Bunlar, Bayer belirtmesine göre; Gama, Delta, Epsilon ve Teta Tauri'dir. "Boğanın gözü" olarak da bilinen Epsilon Tauri,[5] en az bir tane gaz devi gezegen barındırır.[6]

Kaynakça

  1. ^ a b "SIMBAD Astronomical Database". NAME HYADES -- Open (galactic) Cluster. 12 Aralık 2015 tarihinde kaynağından arşivlendi. Erişim tarihi: 24 Mart 2011. 
  2. ^ Perryman, M.A.C.; ve diğerleri. (1998). "The Hyades: distance, structure, dynamics, and age". Astronomy & Astrophysics. Cilt 331. ss. 81-120. Bibcode:1998A&A...331...81P. 
  3. ^ Bouvier J, Kendall T, Meeus G, Testi L, Moraux E, Stauffer JR, James D, Cuillandre J-C, Irwin J, McCaughrean MJ, Baraffe I, Bertin E. (2008) Brown dwarfs and very low mass stars in the Hyades cluster: a dynamically evolved mass function. Astronomy & Astrophysics, 481: 661-672. Abstract at http://adsabs.harvard.edu/abs/2008A%26A...481..661B 21 Mart 2019 tarihinde Wayback Machine sitesinde arşivlendi..
  4. ^ Kaler, Jim. Hyadum I (Gamma Tauri). Web page at http://www.astro.uiuc.edu/~kaler/sow/hyadum1.html 3 Temmuz 2008 tarihinde Wayback Machine sitesinde arşivlendi..
  5. ^ Kaler, Jim. Ain (Epsilon Tauri). Web page at http://www.astro.uiuc.edu/~kaler/sow/ain.html 8 Mart 2005 tarihinde Wayback Machine sitesinde arşivlendi..
  6. ^ Sato B, Izumiura H, Toyota E, et al. (2007) A planetary companion to the Hyades giant Epsilon Tauri. Astrophysical Journal, 661: 527-531. Abstract at http://adsabs.harvard.edu/abs/2007ApJ...661..527S 8 Eylül 2018 tarihinde Wayback Machine sitesinde arşivlendi..

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