凤凰座SX型变星
凤凰座SX型变星是变星的一种，这些恒星的亮度表现出在0.03～0.08天 （0.7～1.9小时）的短周期脉动变化，它们的光谱类型在A2～F5，星等变化可以达到0.7等[1]。相较于太阳，这些恒星的金属量较低，这意味着其它元素相较于氢和氦的丰度是较低的。在恒星光谱分类中，相较于同类型的恒星，它们有着较高的空间速度和低光度[2][3]，这些属性使凤凰座SX型变星和表兄弟的盾牌座δ型变星有所区别。后著有著较长的周期、高金属量和较大的变光幅度[4]。
凤凰座SX型变星主要分出现在球状星团和银晕中，变光周期和亮度明显的有周光关系[5]。所有已知在球状星团中的凤凰座SX型变都是蓝离散星[6]，这些恒星看起来比在同一个星团中有着相同发光度的主序星更蓝 (有着更高的温度)[7]。
列表
下表筛选出一些无论业余或专业天文学家都感兴趣的凤凰座SX型变星。除非另有说明，给定的星等都是V波段。
| 恒星 |
最亮 星等 |
最暗 星等 |
周期 （日） |
光谱 类型 |
|---|---|---|---|---|
| 凤凰座SX [n 1] | 6.76 | 7.53 | 0.055 | A2V |
| HD 94033 | 9.46 | 10.26 | 0.060 | B9III/IV |
| 飞马座DY | 10.00 | 10.56 | 0.073 | F5 |
| 宝瓶座CY | 10.42 | 11.20 | 0.061 | B8 |
| 大熊座AE[n 1] | 10.86 | 11.52 | 0.086 | A9 |
| 天鹅座XX | 11.28 | 12.13 | 0.135 | A5-F5 |
| 鹿豹座BL | 12.92 | 13.25 | 0.039 | |
| 玉夫座BX | 13.42 | 13.71 | 0.037 | A |
注解
参考资料
- ^ GCVS Variability Types. General Catalogue of Variable Stars. Moscow, Russia: Russian Foundation for Basic Research, Sternberg Astronomical Institute. [2010-03-17]. （原始内容存档于2019-09-21）.
- ^ 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.: 392. 1986. Bibcode:1986IAUS..118..385B.
- ^ Breger, M. The nature of dwarf Cepheids. V - Analysis and conclusions. Astrophysical Journal, Part 1. Jan 1980, 235: 156. Bibcode:1980ApJ...235..153B. doi:10.1086/157620.
- ^ McNamara, D. H. Period-luminosity relations of SX Phoenicis stars. Astronomical Journal. April 1995, 109 (4): 1751–1756. Bibcode:1995AJ....109.1751M. doi:10.1086/117405.
- ^ Templeton, Matthew. Variable Star of the Season: Delta Scuti and the Delta Scuti variables. American Association of Variable Star Observers. [2021-05-25]. （原始内容存档于2021-02-16）.
- ^ Jeon, Young-Beom; Lee, Myung Gyoon; Kim, Seung-Lee; Lee, Ho. SX Phoenicis Stars in the Globular Cluster NGC 5466. The Astronomical Journal. July 2004, 128 (1): 11. Bibcode:2004AJ....128..287J. S2CID 17310076. arXiv:astro-ph/0404069
. doi:10.1086/421735.
- ^ Santolamazza, P.; Marconi, M.; Bono, G.; Caputo, F.; Cassisi, S.; Gilliland, R. L. Linear Nonadiabatic Properties of SX Phoenicis Variables. The Astrophysical Journal. June 2001, 554 (2): 1124–1140. Bibcode:2001ApJ...554.1124S. S2CID 17711408. arXiv:astro-ph/0102029 . doi:10.1086/321408.
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