وسترلوند 1
| Westerlund 1 | |
|---|---|
|
الفضل: ESO/VPHAS+ Survey/N. Wright | |
| بيانات الرصد (J2000 الحقبة) | |
| الكوكبة | آرا |
| الصعود المستقيم | 16h 47m 04.0s |
| الميل | −45° 51′ 04.9″ |
| المسافة | 12.1±2.0 (3.7±0.6 kpc) |
| السمات الطبيعية | |
| الكتلة | 63,000 |
| نصف القطر | 3.26 |
| العمر المقدر | 3.50 Myr |
| تسميات أخرى | عنقود آرا، وسترلوند 1، ESO 277-12, C 1644-457, VDBH 197 |
وسترلوند 1 Westerlund 1 (تسمى أيضاً عنقود آرا Ara Cluster، designated Wd1) is a compact young super star cluster في مجرة درب التبانة، على بعد نحو3.5–5 kpc من الأرض. It is one of the most massive young star clusters in the Milky Way, and was discovered by Bengt Westerlund in 1961 but remained largely unstudied for many years due to high interstellar absorption in its direction. In the future, it will probably evolve into a globular cluster.
The cluster contains a large number of rare, evolved, high-mass stars, including:ستة yellow hypergiants, أربعة red supergiants including Westerlund 1-26, one of the largest known stars, 24 Wolf-Rayet stars, a luminous blue variable, many OB supergiants, and an unusual supergiant sgB[e] star which has been proposed to be the remnant of a recent stellar merger. In addition, X-ray observations have revealed the presence of the anomalous X-ray pulsar CXO J164710.2-455216, a slow rotating neutron star that must have formed from a high-mass progenitor star. Westerlund 1 is believed to have formed in a single burst of star formation, implying the constituent stars have similar ages and compositions.
Aside from hosting some of the most massive and least-understood stars in our galaxy, Westerlund 1 is useful as a relatively nearby, easy to observe super star cluster that can help astronomers determine what occurs within extragalactic super star clusters.
الرصد
الهامش
- ^ خطأ استشهاد: وسم
<ref>غير سليم؛ لا نص تم توفيره للمراجع المسماةbrandner - ^ Koumpia, E.; Bonanos, A. Z. (2012). "Fundamental parameters of four massive eclipsing binaries in Westerlund 1". Astronomy & Astrophysics. 547: A30. arXiv:1108.4453. Bibcode:2012A&A...547A..30K. doi:10.1051/0004-6361/201219465.
- ^ Portegies Zwart, Simon F.; McMillan, Stephen L.W.; Gieles, Mark (2010). "Young Massive Star Clusters". Annual Review of Astronomy and Astrophysics. 48: 431. arXiv:1002.1961. Bibcode:2010ARA&A..48..431P. doi:10.1146/annurev-astro-081309-130834.
- ^ Westerlund, B. E. (1968). "On the Extended Infrared Source in ARA". Astrophysical Journal. 154: L67. Bibcode:1968ApJ...154L..67W. doi:10.1086/180270.
- ^ Westerlund, B. (1961). "A Heavily Reddened Cluster in Ara". Astronomical Journal. 70: 57. Bibcode:1961AJ.....66T..57W. doi:10.1086/108585.
- ^ Gallagher & Grebel (2002). "Extragalactic Star Clusters: Speculations on the Future". Extragalactic Star Clusters, IAU Symposium. 207: 207. arXiv:astro-ph/0109052. Bibcode:2002IAUS..207..745G.
- ^ Clark, J. S.; Negueruela, I.; Crowther, P. A.; Goodwin, S. P.; et al. (2005). "On the massive stellar population of the super star cluster Westerlund 1". Astronomy & Astrophysics. 434 (3): 949–969. arXiv:astro-ph/0504342. Bibcode:2005A&A...434..949C. doi:10.1051/0004-6361:20042413.
- ^ Muno, Michael P.; Clark, J. Simon; Crowther, Paul A.; Dougherty, Sean M.; De Grijs, Richard; Law, Casey; McMillan, Stephen L. W.; Morris, Mark R.; Negueruela, Ignacio; Pooley, David; Portegies Zwart, Simon; Yusef-Zadeh, Farhad; et al. (2006). "A Neutron Star with a Massive Progenitor in Westerlund 1". Astrophysical Journal Letters. 636 (1): L41. arXiv:astro-ph/0509408. Bibcode:2006ApJ...636L..41M. doi:10.1086/499776.
وصلات خارجية
- Artist’s impression of a magnetar X-ray satellites catch magnetar in gigantic stellar ‘hiccup’, ESA website, 2007
- Simbad
- Image of Westerlund 1
- Neutron star found where black hole expected
