NGC 6834
| NGC 6834 | |
|---|---|
 | |
| Observation data (J2000.0 epoch) | |
| Right ascension | 19h 52m 12.5s[1] |
| Declination | +29° 24′ 29″[1] |
| Distance | 10,850 ly (3,326.7 pc)[2] |
| Apparent magnitude (V) | 7.8[3] |
| Apparent dimensions (V) | 12′[2] |
| Physical characteristics | |
| Radius | 6.1 ly |
| Estimated age | 65±18 Myr[4] |
| Other designations | NGC 6834, C 1950+292[5] |
| Associations | |
| Constellation | Cygnus |
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
[edit]- ^ 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.
- ^ 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.
- ^ a b Crossen, Craig; Rhemann, Gerald (2012). Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Vienna. p. 68. ISBN 9783709106266.
- ^ 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.
- ^ "NGC 6834". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-01-07.
- ^ 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.
- ^ Seligman, Courtney. "NGC Objects: NGC 6800 - 6849". Celestial Atlas. Retrieved 2022-01-08.
External links
[edit]
Media related to NGC 6834 at Wikimedia Commons
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