Astronomy:NGC 6834
| NGC 6834 | |
|---|---|
 | |
| Observation data (J2000.0 epoch) | |
| Constellation | Cygnus |
| 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] |
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
- ↑ 1.0 1.1 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. doi:10.1051/0004-6361:20031046. Bibcode: 2003A&A...408.1029K.
- ↑ 2.0 2.1 2.2 2.3 2.4 Cantat-Gaudin, T.; Anders, F. (January 2020). "Clusters and mirages: cataloguing stellar aggregates in the Milky Way". Astronomy & Astrophysics 633: 22. doi:10.1051/0004-6361/201936691. A99. Bibcode: 2020A&A...633A..99C.
- ↑ 3.0 3.1 Crossen, Craig; Rhemann, Gerald (2012). Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Vienna. p. 68. ISBN 9783709106266. https://books.google.com/books?id=3vELBwAAQBAJ&pg=PA68.
- ↑ 4.0 4.1 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. doi:10.1111/j.1365-2966.2006.10783.x. Bibcode: 2006MNRAS.371.1641P.
- ↑ "NGC 6834". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6834.
- ↑ 6.0 6.1 6.2 6.3 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. doi:10.1088/1674-4527/14/9/008. 1173-1192. Bibcode: 2014RAA....14.1173M.
- ↑ Seligman, Courtney. "NGC Objects: NGC 6800 - 6849". Celestial Atlas. https://cseligman.com/text/atlas/ngc68.htm#6834.
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