Astronomy:NGC 4349

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Short description: Open cluster in the constellation Crux
NGC 4349
NGC 4349.png
NGC 4349
Observation data (J2000 epoch)
ConstellationCrux
Right ascension 12h 24m 08s[1]
Declination−61° 52′ 18″[1]
Distance7,090 ly (2,176 pc[2])
Apparent magnitude (V)7.4 [1]
Apparent dimensions (V)12'[3]
Physical characteristics
Mass4,400[4] M☉
Estimated age250 million years[3]
Other designationsCr 255, Mel 110
See also: Open cluster, List of open clusters

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.

Characteristics

There are 390 probable member stars within the angular radius of the cluster and 129 within the central part of the cluster. The tidal radius of the cluster is 17.8 - 22.8 parsecs (58 - 75 light years) and represents the average outer limit of NGC 4349, beyond which a star is unlikely to remain gravitationally bound to the cluster core.[4] One blue straggler has been detected in the cluster.[5] There are four Cepheid variables in the direction of the cluster, among them R and T Crucis, which, however, are not members of the cluster.[6] R Crucis lies 16 arcminutes from the centre of the open cluster NGC 4349, which is beyond the outer limit of the cluster, and is estimated to be nearly 1 kpc closer to Earth than the cluster.[7] The cluster has subsolar metallicity (−0.12  ±  0.06).[8]

A brown dwarf with minimum mass 19.8 times that of Jupiter has been detected orbiting star no. 127 (vmag. 10.88 and with mass 3.9 M☉) every 678 days. At the time of discovery, star NGC 4349 No. 127 was the heaviest star with an accurate mass determination around which a substellar companion had been detected, and also one of the youngest systems known.[9] However, this star's radial velocity variations were later shown to result from stellar activity rather than a substellar companion.[10][11]

References

  1. ↑ 1.0 1.1 1.2 "NGC 4349". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+4349. 
  2. ↑ WEBDA page for open cluster NGC 4349
  3. ↑ 3.0 3.1 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. doi:10.1051/0004-6361/201322302. Bibcode: 2013A&A...558A..53K. ftp://cdsarc.u-strasbg.fr/pub/cats/J/A%2BA/558/A53/catalog.dat. 
  4. ↑ 4.0 4.1 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. doi:10.1051/0004-6361:20078525. Bibcode: 2008A&A...477..165P. ftp://cdsarc.u-strasbg.fr/pub/cats/J/A%2BA/477/165/table.dat. 
  5. ↑ Ahumada, J. A.; Lapasset, E. (20 November 2006). "New catalogue of blue stragglers in open clusters". Astronomy & Astrophysics 463 (2): 789–797. doi:10.1051/0004-6361:20054590. Bibcode: 2007A&A...463..789A. ftp://cdsarc.u-strasbg.fr/pub/cats/J/A%2BA/463/789/table8.dat. 
  6. ↑ Anderson, Richard I.; Eyer, Laurent; Mowlavi, Nami (July 2013). "Cepheids in open clusters: an 8D all-sky census". Monthly Notices of the Royal Astronomical Society 434 (3): 2238–2261. doi:10.1093/mnras/stt1160. Bibcode: 2013MNRAS.434.2238A. ftp://cdsarc.u-strasbg.fr/pub/cats/J/MNRAS/434/2238/tablea2.dat. 
  7. ↑ Chen, X.; de Grijs, R.; Deng, L. (19 November 2014). "A search for open cluster Cepheids in the Galactic plane". Monthly Notices of the Royal Astronomical Society 446 (2): 1268–1282. doi:10.1093/mnras/stu2165. Bibcode: 2015MNRAS.446.1268C. 
  8. ↑ Santos, N. C.; Lovis, C.; Melendez, J.; Montalto, M.; Naef, D.; Pace, G. (17 February 2012). "Metallicities for six nearby open clusters from high-resolution spectra of giant stars". Astronomy & Astrophysics 538: A151. doi:10.1051/0004-6361/201118276. Bibcode: 2012A&A...538A.151S. 
  9. ↑ Lovis, C.; Mayor, M. (26 June 2007). "Planets around evolved intermediate-mass stars". Astronomy & Astrophysics 472 (2): 657–664. doi:10.1051/0004-6361:20077375. Bibcode: 2007A&A...472..657L. 
  10. ↑ Delgado Mena, E. et al. (November 2018). "Planets around evolved intermediate-mass stars. II. Are there really planets around IC 4651 No. 9122, NGC 2423 No. 3, and NGC 4349 No. 127?". Astronomy & Astrophysics 619: A2. doi:10.1051/0004-6361/201833152. Bibcode: 2018A&A...619A...2D. 
  11. ↑ Delgado Mena, E. et al. (November 2023). "Planets around evolved intermediate-mass stars. III. Planet candidates and long-term activity signals in six open clusters". Astronomy & Astrophysics 679: A94. doi:10.1051/0004-6361/202346890. Bibcode: 2023A&A...679A..94D. 

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