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NGC 206: Difference between revisions

Coordinates: Sky map 00h 40m 31.3s, +40° 44′ 21″
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{{Short description|OB association in the Andromeda Galaxy}}
{{Short description|OB association in the Andromeda Galaxy}}
{{Use dmy dates|date=March 2012}}
{{Use dmy dates|date=December 2023}}
{{Infobox cluster
{{Infobox cluster
| image = [[File:NGC206.jpg|300px]]
| image = [[File:NGC206.jpg|300px]]
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| work=Results for NGC 206
| work=Results for NGC 206
| url=http://nedwww.ipac.caltech.edu/
| url=http://nedwww.ipac.caltech.edu/
| access-date=2006-11-25 }}</ref>
| access-date=25 November 2006 }}</ref>
| dec = {{DEC|+40|44|21}}<ref name="ned" />
| dec = {{DEC|+40|44|21}}<ref name="ned" />
| dist_ly =
| dist_ly =
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==Features==
==Features==
NGC 206 is the richest and most conspicuous star cloud in the Andromeda Galaxy as well as one of the largest and brightest star formation regions of the [[Local Group]].<ref name=Massey1995>
NGC 206 is the richest and most conspicuous star cloud in the Andromeda Galaxy, and is one of the largest and brightest star-forming regions in the [[Local Group]].<ref name=Massey1995>
{{cite journal
{{cite journal
| volume = 110
| volume = 110
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}}</ref> It contains more than 300 stars brighter than M<sub>b</sub>=−3.6.<ref>{{Cite book|title=The Andromeda Galaxy|first=Paul W.|last=Hodge|author-link=Paul W. Hodge|year=1992|publisher=[[Springer Science+Business Media|Springer]]|page=153}}</ref> It was originally identified by [[Edwin Hubble]] as a star cluster but today, due to its size, it is classified as an [[OB association]].<ref>{{Cite book |url= https://books.google.com/books?id=71FRczXVBWgC&pg=PA20|title=The Andromeda Galaxy |first=Paul W. |last=Hodge|page=20 |publisher=Springer Science & Business Media|year= 1992|isbn=978-0-7923-1654-1}}</ref>
}}</ref> It contains more than 300 stars brighter than M<sub>b</sub>=−3.6.<ref>{{Cite book|title=The Andromeda Galaxy|first=Paul W.|last=Hodge|author-link=Paul W. Hodge|year=1992|publisher=[[Springer Science+Business Media|Springer]]|page=153}}</ref> It was originally identified by [[Edwin Hubble]] as a star cluster but today, due to its size, it is classified as an [[OB association]].<ref>{{Cite book |url= https://books.google.com/books?id=71FRczXVBWgC&pg=PA20|title=The Andromeda Galaxy |first=Paul W. |last=Hodge|page=20 |publisher=Springer Science & Business Media|year= 1992|isbn=978-0-7923-1654-1}}</ref>


NGC 206 is located in a [[spiral arm]] of the Andromeda Galaxy, in a zone free of [[neutral hydrogen]] and has a double structure, with one region that has an age of around 10 million years and includes several [[H II region]]s in one of its borders and other with an age of between 40 million years and 50 million years that includes a number of [[Cepheid variable|cepheids]]. Both parts are separated by a band of [[cosmic dust|interstellar dust]] and include hundreds of stars of [[Stellar classification|spectral type]] [[O-type main-sequence star|O]] and [[B-type main-sequence star|B]].<ref name=Chernin1995>
NGC 206 is located in a [[spiral arm]] of the Andromeda Galaxy, in a zone free of [[neutral hydrogen]]. It contains hundreds of stars of [[Stellar classification|spectral types]] [[O-type main-sequence star|O]] and [[B-type main-sequence star|B]]. The star cloud has a double structure: one region has an age of around 10 million years and includes several [[H II region]]s in its border; the other region has an age of 40 to 50 million years and includes a number of [[Cepheid variable|cepheids]]. The two regions are separated by a band of [[cosmic dust|interstellar dust]].<ref name=Chernin1995>
{{cite journal
{{cite journal
| volume = 275
| volume = 275

Latest revision as of 13:43, 15 December 2023

NGC 206
NGC 206
Observation data (J2000 epoch)
Right ascension00h 40m 31.3s[1]
Declination+40° 44′ 21″[1]
Apparent dimensions (V)4.2′ (arcmin)
Physical characteristics
RadiusCa. 400 ly
Associations
ConstellationAndromeda
See also: Open cluster, List of open clusters

NGC 206 is a bright star cloud in the Andromeda Galaxy, and the brightest star cloud in Andromeda when viewed from Earth.

Features

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NGC 206 is the richest and most conspicuous star cloud in the Andromeda Galaxy, and is one of the largest and brightest star-forming regions in the Local Group.[2] It contains more than 300 stars brighter than Mb=−3.6.[3] It was originally identified by Edwin Hubble as a star cluster but today, due to its size, it is classified as an OB association.[4]

NGC 206 is located in a spiral arm of the Andromeda Galaxy, in a zone free of neutral hydrogen. It contains hundreds of stars of spectral types O and B. The star cloud has a double structure: one region has an age of around 10 million years and includes several H II regions in its border; the other region has an age of 40 to 50 million years and includes a number of cepheids. The two regions are separated by a band of interstellar dust.[5]

See also

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References

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  1. ^ a b "NASA/IPAC Extragalactic Database". Results for NGC 206. Retrieved 25 November 2006.
  2. ^ Massey, Philip; Armandroff, Taft E.; Pyke, Randall; Patel, Kanan; Wilson, Christine D. (1995). "Hot, Luminous Stars in Selected Regions of NGC 6822, M31, and M33". Astronomical Journal. 110: 2715. Bibcode:1995AJ....110.2715M. doi:10.1086/117725.
  3. ^ Hodge, Paul W. (1992). The Andromeda Galaxy. Springer. p. 153.
  4. ^ Hodge, Paul W. (1992). The Andromeda Galaxy. Springer Science & Business Media. p. 20. ISBN 978-0-7923-1654-1.
  5. ^ Chernin, Arthur D.; Efremov, Yury N.; Voinovich, Peter A. (1995). "Superassociations: violent star formation induced by shock-shock collisions". Monthly Notices of the Royal Astronomical Society. 275 (2): 313–326. Bibcode:1995MNRAS.275..313C. doi:10.1093/mnras/275.2.313.
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