HD 49798

**HD 49798**
觀測資料; 曆元 J2000
星座	船尾座
星官
赤經	06h 48m 04.69996s[1]
赤緯	−44° 18′ 58.4377″[1]
視星等（V）	8.287[2]
特性
光谱分类	sdO6p
U−B 色指数	−1.259[2]
B−V 色指数	−0.270[2]
变星类型	高質量X射線聯星（HMXB）[3]
天体测定
徑向速度 (Rv)	12.10[4] km/s
自行 (μ)	赤经：−4.73[1] mas/yr ; 赤纬：5.39[1] mas/yr
视差 (π)	1.20 ± 0.50[1] mas
距离	650[3] pc
	軌道[3]
繞行週期 (P)	1.55天
偏心率 (e)	0.0
倾斜角 (i)	82°
詳細資料
sdO5.5[5]
質量	1.50[3] M☉
半徑	1.45[6] R☉
表面重力 (log g)	4.25[6]
亮度	3,943[6] L☉
溫度	47,500[6] K
WD
質量	1.28[3] M☉
其他命名
	HD 49798, HR 6978, CD−44°2920, SAO 218207, HIP 32602, AAVSO 0645-44
參考資料庫
SIMBAD	资料

HD 49798是在船尾座的一顆聯星，距離地球大約650秒差距。它的視星等為 +8.3等。

HD 49798是在1964年被發現是一顆罕見的，欠缺氫融合的O型次矮星[7]。它被認定是聯星，但是始終未能目視或從光譜檢測出其伴星[8]。

在它的附近，科學家發現了X射線源，並標示為RX J0648.0-4418。但是只有XMM-牛頓衛星太空望遠鏡能夠識別發出這個輻射的天體。它是一顆質量約為1.3太陽質量白矮星，在軌道上以13秒的週期環繞著HD 49798[9]。這一系統被認為是超新星的候選者，在數千年後可能爆炸成為Ia型超新星 [10][11]。

參考資料

Van Leeuwen, F. . Astronomy and Astrophysics. 2007, 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.
Landolt, Arlo U.; Uomoto, Alan K. . The Astronomical Journal. 2007, 133 (3): 768. Bibcode:2007AJ....133..768L. arXiv:0704.3030 . doi:10.1086/510485.
Mereghetti, S.; La Palombara, N.; Tiengo, A.; Sartore, N.; Esposito, P.; Israel, G. L.; Stella, L. . Astronomy & Astrophysics. 2013, 553: A46. Bibcode:2013A&A...553A..46M. arXiv:1304.1653 . doi:10.1051/0004-6361/201321271.
Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. . Astronomy and Astrophysics. 2004, 424 (2): 727. Bibcode:2004A&A...424..727P. arXiv:astro-ph/0406573 . doi:10.1051/0004-6361:20041213.
Mereghetti, S.; Tiengo, A.; Esposito, P.; La Palombara, N.; Israel, G. L.; Stella, L. . Science. 2009, 325 (5945): 1222. Bibcode:2009Sci...325.1222M. PMID 19729650. arXiv:1003.0997 . doi:10.1126/science.1176252.
Kudritzki, R. P.; Simon, K. P. . Astronomy and Astrophysics. 1978, 70: 653. Bibcode:1978A&A....70..653K.
Jaschek, Mercedes; Jaschek, Carlos. . Publications of the Astronomical Society of the Pacific. 1963, 75: 365. Bibcode:1963PASP...75..365J. doi:10.1086/127968.
Thackeray, A. D. . Monthly Notices of the Royal Astronomical Society. 1970, 150 (2): 215. Bibcode:1970MNRAS.150..215T. doi:10.1093/mnras/150.2.215.
Bisscheroux, B. C.; Pols, O. R.; Kahabka, P.; Belloni, T.; Van Den Heuvel, E. P. J. . Astronomy and Astrophysics. 1997, 317: 815. Bibcode:1997A&A...317..815B.
Wang, Bo; Han, Zhanwen. . New Astronomy Reviews. 2012, 56 (4): 122. Bibcode:2012NewAR..56..122W. arXiv:1204.1155 . doi:10.1016/j.newar.2012.04.001.
Liu, Dong-Dong; Zhou, Wei-Hong; Wu, Cheng-Yuan; Wang, Bo. . Research in Astronomy and Astrophysics. 2015, 15 (11): 1813. Bibcode:2015RAA....15.1813L. arXiv:1504.01461 . doi:10.1088/1674-4527/15/11/004.

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[hipparcos-1] Van Leeuwen, F. . Astronomy and Astrophysics. 2007, 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.

[landolt-2] Landolt, Arlo U.; Uomoto, Alan K. . The Astronomical Journal. 2007, 133 (3): 768. Bibcode:2007AJ....133..768L. arXiv:0704.3030 . doi:10.1086/510485.

[mereghetti-3] Mereghetti, S.; La Palombara, N.; Tiengo, A.; Sartore, N.; Esposito, P.; Israel, G. L.; Stella, L. . Astronomy & Astrophysics. 2013, 553: A46. Bibcode:2013A&A...553A..46M. arXiv:1304.1653 . doi:10.1051/0004-6361/201321271.

[4] Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. . Astronomy and Astrophysics. 2004, 424 (2): 727. Bibcode:2004A&A...424..727P. arXiv:astro-ph/0406573 . doi:10.1051/0004-6361:20041213.

[5] Mereghetti, S.; Tiengo, A.; Esposito, P.; La Palombara, N.; Israel, G. L.; Stella, L. . Science. 2009, 325 (5945): 1222. Bibcode:2009Sci...325.1222M. PMID 19729650. arXiv:1003.0997 . doi:10.1126/science.1176252.

[kudritzki-6] Kudritzki, R. P.; Simon, K. P. . Astronomy and Astrophysics. 1978, 70: 653. Bibcode:1978A&A....70..653K.

[jaschek-7] Jaschek, Mercedes; Jaschek, Carlos. . Publications of the Astronomical Society of the Pacific. 1963, 75: 365. Bibcode:1963PASP...75..365J. doi:10.1086/127968.

[8] Thackeray, A. D. . Monthly Notices of the Royal Astronomical Society. 1970, 150 (2): 215. Bibcode:1970MNRAS.150..215T. doi:10.1093/mnras/150.2.215.

[9] Bisscheroux, B. C.; Pols, O. R.; Kahabka, P.; Belloni, T.; Van Den Heuvel, E. P. J. . Astronomy and Astrophysics. 1997, 317: 815. Bibcode:1997A&A...317..815B.

[10] Wang, Bo; Han, Zhanwen. . New Astronomy Reviews. 2012, 56 (4): 122. Bibcode:2012NewAR..56..122W. arXiv:1204.1155 . doi:10.1016/j.newar.2012.04.001.

[liu-11] Liu, Dong-Dong; Zhou, Wei-Hong; Wu, Cheng-Yuan; Wang, Bo. . Research in Astronomy and Astrophysics. 2015, 15 (11): 1813. Bibcode:2015RAA....15.1813L. arXiv:1504.01461 . doi:10.1088/1674-4527/15/11/004.