鳳凰座SX型變星

维基百科,自由的百科全书
跳转至: 导航搜索

鳳凰座SX型變星變星的一種,這些恆星的亮度表現出週期在0.03~0.08天 (0.7~1.9小時) 的脈動變化,它們的光譜類型在A2~F5,星等變化可以達到0.7等[1]。相較於太陽,這些恆星的金屬量較低,這意味著其它元素相較於的豐度是較低的。在相同分類的恆星中,它們也有著較高的空間速度和低光度[2][3],這些屬性使鳳凰座SX型變星和表兄弟的盾牌座δ型變星有所區別。後著有著較成的週期、高金屬量和較大的變光幅度[4]

鳳凰座SX型變星主要分出現在球狀星團銀暈中,變光週期和亮度明顯的有週光關係[5]。已知所有有鳳凰座SX型變星的球狀星團內都有藍掉隊星[6],這些恆星看起來比在同一個星團中有著相同亮度的主序星更藍 (有著更高的溫度)[7]

參考資料[编辑]

  1. ^ GCVS Variability Types. General Catalogue of Variable Stars. Moscow, Russia: Russian Foundation for Basic Research, Sternberg Astronomical Institute. [2010-03-17]. 
  2. ^ Burki, G.; Mayor, M.. Radial velocities with CORAVEL - Results on stellar variability and duplicity. Instrumentation and research programmes for small telescopes; Proceedings of the IAU Symposium. Christchurch, New Zealand: Dordrecht, D. Reidel Publishing Co.. 1986: p. 392. Bibcode 1986IAUS..118..385B. 
  3. ^ Breger, M. The nature of dwarf Cepheids. V - Analysis and conclusions. Astrophysical Journal, Part 1. 1980-01, 235: 156. Bibcode:1980ApJ...235..153B. doi:10.1086/157620. 
  4. ^ McNamara, D. H. Period-luminosity relations of SX Phoenicis stars. Astronomical Journal. 1995--April, 109 (4): 1751–1756. Bibcode:1995AJ....109.1751M. doi:10.1086/117405. 
  5. ^ Templeton, Matthew. Variable Star of the Season: Delta Scuti and the Delta Scuti variables. American Association of Variable Star Observers. 
  6. ^ Jeon, Young-Beom; Lee, Myung Gyoon; Kim, Seung-Lee; Lee, Ho. SX Phoenicis Stars in the Globular Cluster NGC 5466. The Astronomical Journal. 2004-07, 128 (1): 11. arXiv:astro-ph/0404069. Bibcode:2004AJ....128..287J. doi:10.1086/421735. 
  7. ^ Santolamazza, P.; Marconi, M.; Bono, G.; Caputo, F.; Cassisi, S.; Gilliland, R. L. Linear Nonadiabatic Properties of SX Phoenicis Variables. The Astrophysical Journal. 2001-06, 554 (2): 1124–1140. arXiv:astro-ph/0102029. Bibcode:2001ApJ...554.1124S. doi:10.1086/321408.