Cannabaceae

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NGC 6834
Observation data (J2000.0 epoch)
Right ascension19h 52m 12.5s[1]
Declination+29° 24′ 29″[1]
Distance10,850 ly (3,326.7 pc)[2]
Apparent magnitude (V)7.8[3]
Apparent dimensions (V)12′[2]
Physical characteristics
Radius6.1 ly
Estimated age65±18 Myr[4]
Other designationsNGC 6834, C 1950+292[5]
Associations
ConstellationCygnus
See also: Open cluster, List of open clusters

NGC 6834 is a young[6] open cluster of stars located about 10,850[2] light years from the Sun in the constellation Cygnus. It was discovered on July 17, 1784, by Anglo-German astronomer William Herschel.[7] The cluster has a visual magnitude of 7.8, which is dimmed by 2.1 magnitudes due to interstellar dust.[3] Half the cluster members lie within an angular radius of 6′.[2]

The Trumpler class of this cluster is II 2 m, indicating it is medium-rich in stars (m) with a moderate brightness range (2) and little central concentration of the stars (II).[6] It has about 260 members[2] and an age of approximately 65 million years,[4] although estimates range from 50 to 80 million.[6] A total of fifteen B-type variable stars have been detected in the cluster with four Be stars. Five of the cluster members show hydrogen alpha emission, including a γ Cas and two λ Eri variables.[6]

References

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  1. ^ a b Kerber, F.; et al. (September 2003). "Galactic Planetary Nebulae and their central stars. I. An accurate and homogeneous set of coordinates". Astronomy and Astrophysics. 408 (3): 1029–1035. Bibcode:2003A&A...408.1029K. doi:10.1051/0004-6361:20031046.
  2. ^ a b c d e Cantat-Gaudin, T.; Anders, F. (January 2020). "Clusters and mirages: cataloguing stellar aggregates in the Milky Way". Astronomy & Astrophysics. 633: 22. arXiv:1911.07075. Bibcode:2020A&A...633A..99C. doi:10.1051/0004-6361/201936691. S2CID 208138247. A99.
  3. ^ a b Crossen, Craig; Rhemann, Gerald (2012). Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Vienna. p. 68. ISBN 9783709106266.
  4. ^ a b Paunzen, E.; Netopil, M. (October 2006). "On the current status of open-cluster parameters". Monthly Notices of the Royal Astronomical Society. 371 (4): 1641–1647. arXiv:astro-ph/0607421. Bibcode:2006MNRAS.371.1641P. doi:10.1111/j.1365-2966.2006.10783.x. S2CID 15047964.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  5. ^ "NGC 6834". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-01-07.
  6. ^ a b c d Mathew, Blesson; et al. (September 2014). "Optical/IR studies of Be stars in NGC 6834 with emphasis on two specific stars". Research in Astronomy and Astrophysics. 14 (9): 1173–1192. arXiv:1408.6658. Bibcode:2014RAA....14.1173M. doi:10.1088/1674-4527/14/9/008. S2CID 118378570. 1173-1192.
  7. ^ Seligman, Courtney. "NGC Objects: NGC 6800 - 6849". Celestial Atlas. Retrieved 2022-01-08.
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  • Media related to NGC 6834 at Wikimedia Commons


source: Https://en.wikipedia.org/wiki/NGC_6834

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

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