NGC 2527 explained

NGC 2527
Type:Open Cluster
Epoch:J2000
Constellation:Puppis
Ra:[1]
Dist Ly:1,960 ly
Dist Pc:601 pc[2]
Appmag V:6.5
Size V:20'
Mass Msol:740[3]
Age:445 million years
810 million years
Names:NGC 2520, Cr 174

NGC 2527 (also catalogued as NGC 2520) 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.[4]

The core radius of the cluster is 1 parsec (3.3 light years), while the tidal radius is 5.1 parsecs (17 light years) and represents the average outer limit of NGC 2527, beyond which a star is unlikely to remain gravitationally bound to the cluster core. 37 stars, probable members of the cluster, are located within the central part of the cluster and 96 probable members are located within the angular radius of the cluster.[5] The brightest star members are A-type stars, with the brightest being an A3 star with magnitude 9.38.[6] In the cluster has been detected one white dwarf, with mass . Its age is estimated to be years and the progenitor star has initial mass circa 3.1 .[7] The turn-off mass of the cluster is at 2.8 . The metallicity of the cluster is -0.01, similar to the solar one.[8]

NGC 2527 lies 3.8 degrees south of Rho Puppis and can be seen with 50mm binoculars as a moderately large, bright patch of haze, with no stars visible with direct vision.[9]

Notes and References

  1. NGC 2527. 2015-06-19.
  2. http://www.univie.ac.at/webda/cgi-bin/ocl_page.cgi?dirname=ngc2527 WEBDA: NGC 2527
  3. Piskunov. A. E.. Schilbach. E.. Kharchenko. N. V.. Röser. S.. Scholz. R.-D.. [ftp://cdsarc.u-strasbg.fr/pub/cats/J/A%2BA/477/165/table.dat Tidal radii and masses of open clusters]. Astronomy & Astrophysics. 6 November 2007. 477. 1. 165–172. 10.1051/0004-6361:20078525. 2008A&A...477..165P . free.
  4. Web site: Seligman . Courtney . NGC 2520 (= NGC 2527 = OCL 685) . Celestial Atlas . 19 November 2018.
  5. Kharchenko. N. V.. Piskunov. A. E.. Schilbach. E.. Röser. S.. Scholz. R.-D.. [ftp://cdsarc.u-strasbg.fr/pub/cats/J/A%2BA/558/A53/catalog.dat Global survey of star clusters in the Milky Way]. Astronomy & Astrophysics. 3 October 2013. 558. A53. 10.1051/0004-6361/201322302. 1308.5822 . 2013A&A...558A..53K . 118548517.
  6. Lindoff . U . The open cluster NGC 2527 . Astronomy and Astrophysics Supplement . February 1973 . 9 . 299 . 1973A&AS....9..229L.
  7. Raddi . R. . Catalán . S. . Gänsicke . B. T. . Hermes . J. J. . Napiwotzki . R. . Koester . D. . Tremblay . P.-E. . Barentsen . G. . Farnhill . H. J. . Mohr-Smith . M. . Drew . J. E. . Groot . P. J. . Guzman-Ramirez . L. . Parker . Q. A. . Steeghs . D. . Zijlstra . A. . A search for white dwarfs in the Galactic plane: the field and the open cluster population . Monthly Notices of the Royal Astronomical Society . 6 February 2016 . 457 . 2 . 1988–2004 . 10.1093/mnras/stw042. free . 1601.02019. 2016MNRAS.457.1988R . 587170 .
  8. Reddy. A. B. S.. Giridhar. S.. Lambert. D. L.. 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. 11 April 2013. 431. 4. 3338–3348. 10.1093/mnras/stt412. free . 1303.1104 . 2013MNRAS.431.3338R . 119191372.
  9. Book: Thompson . Robert Bruce . Thompson . Barbara Fritchman . Illustrated Guide to Astronomical Wonders: From Novice to Master Observer . 2007 . Maker Media, Inc. . 9781680451917 . 184 . en.

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