NGC 2539

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NGC 2539
NGC 2539.png
NGC 2539
Observation data (J2000 epoch)
Right ascension 08h 10m 37s [1]
Declination −12° 49′ 06″ [1]
Distance 4,440 ly (1,363 pc [2] )
Apparent magnitude  (V)6.5 [1]
Apparent dimensions (V)15'
Physical characteristics
Mass5,480 [3]   M☉
Estimated age370 million years [2]
Other designations Cr 176, Mel 83
Associations
Constellation Puppis
See also: Open cluster, List of open clusters

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.

Contents

Characteristics

The diameter of the cluster based on the location of possible members is estimated to be 7.4 parsecs (24 light years). [4] The core radius of the cluster is 1.98 parsecs (6.5 light years), while the tidal radius is 15.2 parsecs (50 light years) and represents the average outer limit of NGC 2539, beyond which a star is unlikely to remain gravitationally bound to the cluster core. [5] 151 stars, probable members of the cluster, are located within the central part of the cluster and 455 probable members are located within the angular radius of the cluster. [5] 19 Puppis, visible near the edge of the cluster is a foreground star. [6] The turn-off mass of the cluster is at 3.1 M☉. The metallicity of the cluster is 0.14, higher than the solar one. [7] The age of the cluster has been estimated to be as high as 630 myrs. [8] [4]

Mermilliod and Mayor studied 11 red giants within the cluster, the brightest of which was mag 9.509 and of spectral type K5I-II, and two non-members. Three of this stars were found to be spectrographic binaries, while further studies indicated that one of them is a triple system. Two more are suspected double stars. [9] [10] Further studies revealed seven variable stars, 5 eclipsing binaries, one delta Scuti variable and one gamma Doradus variable, with the gamma Doratus variable star membership being questionable. From the eclipsing binaries, one is field star [11] and in a further study one more eclipsing binary (specifically a W Ursae Majoris variable) was found to lie at the background. [12]

Related Research Articles

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Messier 26, also known as NGC 6694, is an open cluster of stars in the southern constellation of Scutum. It was discovered by Charles Messier in 1764. This 8th magnitude cluster is a challenge to find in ideal skies with typical binoculars, where it can be, with any modern minimum 3-inch (76 mm) aperture device. It is south-southwest of the open cluster Messier 11 and is 14′ across. About 25 stars are visible in a telescope with a 150–200 mm (6–8 in) aperture.

<span class="mw-page-title-main">Phi Cassiopeiae</span> Star in the constellation Cassiopeia

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<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

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<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">QZ Puppis</span> Star in the constellation Puppis

QZ Puppis is a class B2.5V star in the constellation Puppis. Its apparent magnitude is 4.5 and it is approximately 650 light years away based on parallax.

<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 7209</span> Open cluster in the constellation Lacerta

NGC 7209 is an open cluster in the constellation Lacerta. It was discovered by William Herschel on 19 October 1787. The cluster lies 3,810 light years away from Earth. It has been suggested that there is another cluster at a distance of 2,100 light years projected in front of a cluster lying at 3,800 light years away, based on the reddening of the cluster, however, further photometric studies of the cluster did not support that claim.

<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 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.

<span class="mw-page-title-main">NGC 6910</span> Open cluster in the constellation Cygnus

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. NGC 6910 is the core cluster of the stellar association Cygnus OB9.

References

  1. 1 2 3 "NGC 2539". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2015-06-19.
  2. 1 2 WEBDA: NGC 2539
  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. 1 2 Lapasset, E.; Clariá, J. J.; Mermilliod, J.-C. (September 2000). "UBV photometric study and basic parameters of the southern open cluster NGC 2539". Astronomy and Astrophysics. 361: 945–951. Bibcode:2000A&A...361..945L.
  5. 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.
  6. ↑ "NGC 2539 in Puppis". jthommes.com.
  7. ↑ Reddy, A. B. S.; Giridhar, S.; Lambert, D. L. (11 April 2013). "Comprehensive abundance analysis of red giants in the open clusters NGC 2527, 2682, 2482, 2539, 2335, 2251 and 2266". Monthly Notices of the Royal Astronomical Society. 431 (4): 3338–3348. arXiv: 1303.1104 . Bibcode:2013MNRAS.431.3338R. doi: 10.1093/mnras/stt412 .
  8. ↑ Choo, K. J.; Kim, S.-L.; Yoon, T. S.; Chun, M.-Y.; Sung, H.; Park, B.-G.; Ann, H. B.; Lee, M. G.; Jeon, Y.-B.; Yuk, I.-S. (5 February 2003). "Search for variable stars in the open cluster NGC 2539". Astronomy & Astrophysics. 399 (1): 99–104. Bibcode:2003A&A...399...99C. doi: 10.1051/0004-6361:20021704 .
  9. ↑ Mermilliod, J.-C.; Andersen, J.; Latham, D. W.; Mayor, M. (23 July 2007). "Red giants in open clusters". Astronomy & Astrophysics. 473 (3): 829–845. Bibcode:2007A&A...473..829M. doi: 10.1051/0004-6361:20078007 .
  10. ↑ Mermilliod, J. C.; Mayor, M. (July 1989). "Red giants in open clusters. I. Binarity and stellar evolution in five Hyades-generation clusters : NGC 2447, 2539, 2632, 6633 and 6940". Astronomy and Astrophysics. 219: 125–141. Bibcode:1989A&A...219..125M.
  11. ↑ Choo, K. J.; Kim, S.-L.; Yoon, T. S.; Chun, M.-Y.; Sung, H.; Park, B.-G.; Ann, H. B.; Lee, M. G.; Jeon, Y.-B.; Yuk, I.-S. (5 February 2003). "Search for variable stars in the open cluster NGC 2539". Astronomy & Astrophysics. 399 (1): 99–104. Bibcode:2003A&A...399...99C. doi: 10.1051/0004-6361:20021704 .
  12. ↑ Kiron, Y. Ravi; Sriram, K.; Vivekananda Rao, P. (March 2012). "A photometric study of contact binaries V3 and V4 in NGC 2539". Bulletin of the Astronomical Society of India. 40: 51. Bibcode:2012BASI...40...51K.


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