NGC 6910

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NGC 6910
NGC6910.jpg
Simulated image of NGC 6910
Observation data (J2000 epoch)
Right ascension 20h 23m 08s [1]
Declination +40° 46′ 30″ [1]
Distance 3,710 ly (1,139 pc [2] )
Apparent magnitude  (V)7.4 [1]
Apparent dimensions (V)10'
Physical characteristics
Mass207 [3]   M☉
Estimated age7 [4] – 13 million years [2]
Part of Cygnus OB9
Other designationsOCl 181
Associations
Constellation Cygnus
See also: Open cluster, List of open clusters

NGC 6910 is an open cluster in the constellation Cygnus. It was discovered by William Herschel on October 17, 1786. The cluster was also observed by John Herschel on September 18, 1828. It is a poor cluster with prominent central concentration and Trumpler class I2p. [5] NGC 6910 is the core cluster of the stellar association Cygnus OB9. [6]

Contents

Details

The location of NGC 6910 in the sky NGC 6910 map.png
The location of NGC 6910 in the sky

NGC 6910 is located half a degree east-north east of Gamma Cygni, also known as Sadr. It may be physically related with the nebula IC 1318 (also known as the Gamma Cygni Nebula) as it lies at a similar distance, behind the galactic Great Rift. Cygnus OB9 is located within the Orion Arm of the Milky Way. Cygnus OB9's dimensions in the sky are 2.5 degrees by 1.5 degrees, which corresponds at its distance to 175×105 light years across. It includes many OB stars, along with supergiant stars, like the red supergiant RW Cygni. [7] Gamma Cygni is a foreground star, lying at a distance of approximately 1,500 light years. [8] Because it lies behind a number of molecular clouds, the light from NGC 6910 is dimmed by more than one magnitude. [9]

The core radius of the cluster is 0.8 parsec (2.6 light years), while the tidal radius is 4.2 parsecs (13.7 light years) and represents the average outer limit of NGC 6910, beyond which a star is unlikely to remain gravitationally bound to the cluster core. [10] 125 stars, probable members of the cluster, are located within the central part of the cluster, and 280 probable members are located within the angular radius of the cluster. [10] The brightest apparent member of NGC 6910 is a blue supergiant HD 194279 (V2118 Cygni) with spectral type B2 and apparent magnitude 7.0. It is located at the southeast edge of the cluster. [7] It is a variable star with P Cygni profile. [6] A mag 8.1 star lies at the northwest edge of the cluster and a mag 8.5 O6 giant star (HD 229196, also known as V2245 Cygni) lies a bit southwest from the line connecting the two brightest stars. Other members of the cluster include two 10.3 mag stars, one being an O9.5 and the other a B0.5 main sequence stars. [7] The star NGC 6910 37 is categorised based on its emission as a Be star and NGC 6910 14 and NGC 6910 25 are beta Cephei variables. [6] In total there are four beta Cephei variables in the cluster, a rather high number. Their presence has been attributed to the higher metallicity of the cluster. [11]

Observing NGC 6910

Although visible via binoculars, the cluster is too compact to resolve in low power instruments. Individual stars can be seen with 15×100 binoculars. [7] When seen in low magnification through a 5-inch telescope, the cluster looks like a crescent between the two brighter stars, while more powerful magnification reveals more stars forming streams extending to either side of the cluster. [8]

Related Research Articles

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Messier 39 or M39, also known as NGC 7092, is an open cluster of stars in the constellation of Cygnus, positioned two degrees to the south of the star Pi Cygni and around 9° east-northeast of Deneb. The cluster was discovered by Guillaume Le Gentil in 1749, then Charles Messier added it to his catalogue in 1764. When observed in a small telescope at low power the cluster shows around two dozen members but is best observed with binoculars. It has a total integrated magnitude (brightness) of 5.5 and spans an angular diameter of 29 arcminutes – about the size of the full Moon. It is centered about 1,010 light-years away.

<span class="mw-page-title-main">KY Cygni</span> Star in the constellation Cygnus

KY Cygni is a red supergiant of spectral class M3.5Ia located in the constellation Cygnus. It is approximately 5,000 light-years away.

<span class="mw-page-title-main">Kappa Crucis (star)</span> Star in the constellation Crux

Kappa Crucis is a spectroscopic binary star in the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster.

<span class="mw-page-title-main">V4381 Sagittarii</span> Star in the constellation Sagittarius

V4381 Sagittarii is a variable star in the constellation Sagittarius. A white supergiant of spectral type A2/A3Iab, it is an Alpha Cygni variable that varies between apparent photographic magnitudes 6.57 and 6.62. Its visual apparent magnitude is about 6.54.

<span class="mw-page-title-main">NGC 6281</span> Open cluster in the constellation of Scorpius

NGC 6281 is an open cluster of stars in the constellation Scorpius. It was not included in the Messier or Caldwell catalogues of nebulous objects, but it is the brightest such cluster in the constellation to be left out of both. It is readily observed with the naked eye; it is located about 2° to the east of Mu Scorpii. James Dunlop described the cluster as a "curiously curved line of pretty bright stars, with many stars mixt". John Herschel then described the cluster as both "pretty bright" and "pretty rich".

<span class="mw-page-title-main">NGC 2439</span> Open cluster in the constellation Puppis

NGC 2439 is a sparse open cluster of stars in the constellation Puppis. It has an apparent visual magnitude of 6.9, an angular size of 10 arcminutes, and is visible using a small telescope. This is a young cluster with age estimates in the range of 20–300 million years. It has a tidal radius of approximately 82 light years. No chemically peculiar stars have been found.

<span class="mw-page-title-main">HR 4887</span> Star in the constellation Crux

HR 4887 is a suspected variable star in the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster.

<span class="mw-page-title-main">DS Crucis</span> Star in the constellation Crux

DS Crucis is a variable star near the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster. It is in the constellation Crux.

<span class="mw-page-title-main">BU Crucis</span> Star in the constellation Crux

BU Crucis is a variable star in the open cluster NGC 4755, which is also known as the Kappa Crucis Cluster or Jewel Box Cluster.

<span class="mw-page-title-main">DU Crucis</span> Star in the constellation Crux

DU Crucis is a red supergiant and slow irregular variable star in the open cluster NGC 4755, which is also known as the Kappa (κ) Crucis Cluster or Jewel Box Cluster.

<span class="mw-page-title-main">NGC 2539</span> Open cluster in the constellation Puppis

NGC 2539 is an open cluster in the constellation Puppis, located at the north edge of the constellation. It was discovered by William Herschel on January 31, 1785. It is a moderately rich cluster and with little central concentration, with Trumpler class II1m.

<span class="mw-page-title-main">IC 2395</span> Open cluster in the constellation Vela

IC 2395 is an open cluster in the constellation Vela.

<span class="mw-page-title-main">NGC 3228</span> Open cluster in the constellation Vela

NGC 3228 is an open cluster in Vela. It was discovered by Nicolas Louis de Lacaille in 1751–1752, while he was in South Africa and catalogued it as Lac II.7. It is small but bright and can be observed easily with binoculars in sufficiently dark skies.

<span class="mw-page-title-main">NGC 5460</span> Open cluster in the constellation Centaurus

NGC 5460 is an open cluster in the constellation Centaurus. It is a bright but loose cluster of intermediate age located approximately 2,300 light years away from Earth. It is located nearly 2 degrees east-southeast of Zeta Centauri.

<span class="mw-page-title-main">NGC 4349</span> Open cluster in the constellation Crux

NGC 4349 is an open cluster in the constellation Crux. It was discovered by James Dunlop in 1826. It is located approximately 7,000 light years away from Earth.

<span class="mw-page-title-main">NGC 4103</span> Open cluster in the constellation Crux

NGC 4103 is an open cluster in the constellation Crux. It was discovered by James Dunlop in 1826. It is located approximately 5,000 light years away from Earth, in the Carina-Sagittarius arm.

IC 2488 is an open cluster in the constellation Vela. It was discovered by Nicolas-Louis de Lacaille in 1752. It is located approximately 3,700 light years away from Earth.

IC 2714 is an open cluster in the constellation Carina. It was discovered by James Dunlop in 1826. It is located approximately 4,000 light years away from Earth, in the Carina–Sagittarius Arm.

<span class="mw-page-title-main">NGC 2527</span> Open cluster in the constellation Puppis

NGC 2527 is an open cluster in the constellation Puppis. It was discovered by William Herschel on December 9, 1784. The cluster was also observed by John Herschel on January 7, 1831. He also observed it on February 5, 1837, identifying it as a different object, which was catalogued as NGC 2520. It is a poor cluster and with no central concentration, with Trumpler class III1p.

<span class="mw-page-title-main">NGC 7160</span> Open cluster in the constellation Cepheus

NGC 7160 is an open cluster in the constellation Cepheus. It was discovered by William Herschel on November 9, 1789. The cluster was also observed by John Herschel on October 7, 1829. It is a poor cluster and with little central concentration, with Trumpler class II3p. It is part of the stellar association Cepheus OB2, located one degree south-southwest of VV Cephei.

References

  1. 1 2 3 "NGC 6910". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2015-06-19.
  2. 1 2 WEBDA: NGC 6910
  3. ↑ Piskunov, A. E.; Schilbach, E.; Kharchenko, N. V.; Röser, S.; Scholz, R.-D. (6 November 2007). "Tidal radii and masses of open clusters". Astronomy & Astrophysics. 477 (1): 165–172. Bibcode:2008A&A...477..165P. doi: 10.1051/0004-6361:20078525 .
  4. ↑ Vansevičius, V. (1 January 1992). "Photoelectric Vilnius Photometry in the Direction of the Open Cluster NGC 6910". Open Astronomy. 1 (1): 31. Bibcode:1992BaltA...1...31V. doi: 10.1515/astro-1992-0106 .
  5. ↑ Seligman, Courtney. "NGC 6910 (= OCL 236)". Celestial Atlas. Retrieved 19 November 2018.
  6. 1 2 3 Kubát, J.; Korčáková, D.; Kawka, A.; Pigulski, A.; Šlechta, M.; Škoda, P. (2 July 2007). "The Hα stellar and interstellar emission in the open cluster NGC 6910". Astronomy & Astrophysics. 472 (1): 163–167. arXiv: 0706.3709 . Bibcode:2007A&A...472..163K. doi:10.1051/0004-6361:20077171. S2CID   14710276.
  7. 1 2 3 4 Crossen, Craig; Rhemann, Gerald (2012). Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Science & Business Media. p. 69. ISBN   9783709106266.
  8. 1 2 O'Meara, Stephen James (2011). Deep-Sky Companions: The Secret Deep. Cambridge University Press. p. 410. ISBN   9781139500074.
  9. ↑ Delgado, Antonio J.; Alfaro, Emilio J. (April 2000). "Search for Pre–Main-Sequence Stars in the Young Galactic Cluster NGC 6910". The Astronomical Journal. 119 (4): 1848–1854. Bibcode:2000AJ....119.1848D. doi:10.1086/301298. S2CID   119906174.
  10. 1 2 Kharchenko, N. V.; Piskunov, A. E.; Schilbach, E.; Röser, S.; Scholz, R.-D. (3 October 2013). "Global survey of star clusters in the Milky Way". Astronomy & Astrophysics. 558: A53. arXiv: 1308.5822 . Bibcode:2013A&A...558A..53K. doi:10.1051/0004-6361/201322302. S2CID   118548517.
  11. ↑ Kolaczkowski, Z.; Pigulski, A.; Kopacki, G.; Michalska, G. (1 March 2004). "A CCD Search for Variable Stars of Spectral Type B in the Northern Hemisphere Open Clusters. VI. NGC 6910" (PDF). Acta Astronomica. 54: 33–55. Bibcode:2004AcA....54...33K. ISSN   0001-5237.
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