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Blanco 1

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Star cluster in the constellation of Sculptor
Blanco 1
Observation data (J2000 epoch)
Right ascension00 04 24
Declination–29° 56.4′
Distance850+160
−130 ly (260+50
−40 pc)
Physical characteristics
Estimated age100–150 Myr
Associations
ConstellationSculptor
See also: Open cluster, List of open clusters

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 1959, who noticed an unusually high proportion of A-type stars in an area spanning 1.5°. 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, 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. Roughly half the stars in the cluster are members of binary star systems; six of the member stars are confirmed spectroscopic binaries. 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. There are also some 30–40 brown dwarf members.

References

  1. ^ 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, arXiv:0706.2102, Bibcode:2007A&A...471..499M, doi:10.1051/0004-6361:20066308, S2CID 14759280.
  2. Blanco, Victor M. (August 1949), "A New Galactic Star Cluster in Sculptor", Publications of the Astronomical Society of the Pacific, 61 (361): 183, Bibcode:1949PASP...61..183B, doi:10.1086/126171, S2CID 121905502.
  3. Bagnall, Philip M. (2012), The Star Atlas Companion: What You Need to Know about the Constellations, Springer, p. 409, ISBN 978-1461408307.
  4. Stauffer, John R.; et al. (August 1949), "Debris Disks of Members of the Blanco 1 Open Cluster", The Astrophysical Journal, 719 (2): 1859–1871, arXiv:1007.0239, Bibcode:2010ApJ...719.1859S, doi:10.1088/0004-637X/719/2/1859, S2CID 30296284.
  5. González, J. F.; Levato, H. (November 2009), "Spectroscopic study of the open cluster Blanco 1", Astronomy and Astrophysics, 507 (1): 541–547, Bibcode:2009A&A...507..541G, doi:10.1051/0004-6361/200912772.
  6. Smith, Gareth D.; Gillen, Edward; Queloz, Didier; Hillenbrand, Lynne A.; Acton, Jack S.; Alves, Douglas R.; Anderson, David R.; Bayliss, Daniel; Briegal, Joshua T.; Burleigh, Matthew R.; Casewell, Sarah L.; Delrez, Laetitia; Dransfield, Georgina; Ducrot, Elsa; Gill, Samuel; Gillon, Michaël; Goad, Michael R.; Günther, Maximilian N.; Henderson, Beth A.; Jenkins, James S.; Jehin, Emmanuël; Moyano, Maximiliano; Murray, Catriona A.; Pedersen, Peter P.; Sebastian, Daniel; Thompson, Samantha; Tilbrook, Rosanna H.; Triaud, Amaury H M J.; Vines, Jose I.; Wheatley, Peter J. (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. arXiv:2109.00836. doi:10.1093/mnras/stab2374.
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