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

^ ^1.0 ^1.1 双模

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.

[double-8] 1.0 ^1.1 双模

[GCVS-1] 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_mayor86-2] 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.: 392. 1986. Bibcode:1986IAUS..118..385B.

[apj235-3] 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.

[aj109-4] 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.

[aavso-5] 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）.

[aj128-6] 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.

[apj554-7] 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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