Short description: Star cluster in the constellation of Sculptor
Blanco 1 (ζ Sculptoris cluster) is a nearby open cluster of stars located around 850 light years away from the Sun in the southern constellation of Sculptor near the star ζ Sculptoris. It was discovered by Puerto Rican astronomer Víctor Manuel Blanco in 1949,[1] who noticed an unusually high proportion of A-type stars in an area spanning 1.5°.[2] This cluster is relatively young, with an age of about 100–150 million years. It is positioned at a high galactic latitude of b = –79.3° and is located some 780 ly (240 pc) below the galactic plane.
Blanco 1 contains approximately 300 stars, around 170 of these being brighter than magnitude +12,[3] the brightest of which is HD 225187, a 7th-magnitude B8V star. It has a cross-sectional magnitudal density of about 30 per square parsec: less than half that of the Pleiades cluster. Of the confirmed members, eight have been found to radiate an excess of infrared energy, indicating that they host orbiting debris disks.[4] Roughly half the stars in the cluster are members of binary star systems; six of the member stars are confirmed spectroscopic binaries.[5] A system known as NGTS J0002-29 is a triple system that contains one of only a few well-characterised eclipsing binaries with two red dwarfs: they orbit each other with a period of 1.098 days.[6] There are also some 30–40 brown dwarf members.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Moraux, E. et al. (August 2007), "The lower mass function of the young open cluster Blanco 1: from 30 MJup to 3 M⊙", Astronomy and Astrophysics 471 (2): 499–513, doi:10.1051/0004-6361:20066308, Bibcode: 2007A&A...471..499M.
- ↑ Blanco, Victor M. (August 1949), "A New Galactic Star Cluster in Sculptor", Publications of the Astronomical Society of the Pacific 61 (361): 183, doi:10.1086/126171, Bibcode: 1949PASP...61..183B.
- ↑ Bagnall, Philip M. (2012), The Star Atlas Companion: What You Need to Know about the Constellations, Springer, p. 409, ISBN 978-1461408307, https://books.google.com/books?id=KcIg02TKW6QC&pg=PA409.
- ↑ Stauffer, John R. et al. (August 1949), "Debris Disks of Members of the Blanco 1 Open Cluster", The Astrophysical Journal 719 (2): 1859–1871, doi:10.1088/0004-637X/719/2/1859, Bibcode: 2010ApJ...719.1859S.
- ↑ González, J. F.; Levato, H. (November 2009), "Spectroscopic study of the open cluster Blanco 1", Astronomy and Astrophysics 507 (1): 541–547, doi:10.1051/0004-6361/200912772, Bibcode: 2009A&A...507..541G.
- ↑ Smith, Gareth D.; Gillen, Edward; Queloz, Didier; Hillenbrand, Lynne A.; Acton, Jack S.; Alves, Douglas R.; Anderson, David R.; Bayliss, Daniel et al. (2021). "NGTS clusters survey – III. A low-mass eclipsing binary in the Blanco 1 open cluster spanning the fully convective boundary". Monthly Notices of the Royal Astronomical Society 507 (4): 5991–6011. doi:10.1093/mnras/stab2374.
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