NGC 2547

NGC 2547 is a southern open cluster in Vela, discovered by Nicolas Louis de Lacaille in 1751[2] from South Africa. The star cluster is young with an age of 20-30 million years.[3]

NGC 2547
This image from the Wide Field Imager on the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile, shows the bright open star cluster NGC 2547.
Observation data (J2000.0 epoch)
ConstellationVela
Right ascension8h 09m 52.360s
Declination−49° 10′ 35.01″
Distance1.19 kly (364.0+46.8
−37.9[1] pc)
Apparent magnitude (V)4.7
Apparent dimensions (V)20′
Physical characteristics
Mass201[1] M☉
Radius2.61[1] ly
Estimated age37.7+5.7
−4.8[1] Myr
Other designationsNGC 2547, Cr 177, Mel 84, Dunlop 410, Lacaille III.2

Observations with the Spitzer Space Telescope showed a shell around the B3 III/IV-type star HD 68478. This could be a sign of recent mass loss in this star.[4]

A study using Gaia DR2 data showed that NGC 2547 formed about 30 million years ago together with a new discovered star cluster, called [BBJ2018] 6.[5][6] The star cluster NGC 2547 has a similar age compared with Trumpler 10, NGC 2451B, Collinder 135 and Collinder 140. It was suggested that all these clusters formed in a single event of triggered star formation.[7]

NGC 2547 shows evidence for mass segregation down to 3 M☉.[8]

Cluster members with debris disks

Observations with the Spitzer Space Telescope have shown that ≤1% of the stars in NGC 2547 have infrared excess in 8.0 μm and 30-45% of the B- to F-type stars have infrared excess at 24 μm.[9]

The system 2MASS J08090250-4858172, also called ID8 is located in NGC 2547 and showed substantial brightening of the debris disk at a wavelength of 3 to 5 micrometers, followed by a decay over a year. This was interpreted as a violent impact on a planetary body in this system.[10]

NGC 2547 contains nine M-dwarfs with 24 μm excess. These could be debris disks and the material could be orbiting close to the snow line of these stars, indicating that planet-formation is underway in these systems.[11] Later it was suggested that these M-dwarfs might contain Peter Pan Disks.[12] 2MASS 08093547-4913033, which is one of the M-dwarfs with a debris disk in NGC 2547 was observed with the Spitzer Infrared Spectrograph. In this system the first detection of silicate was made from a debris disk around an M-type star.[13]

  • Asteroid collision - building planets near star NGC 2547-ID8 (artist concept)
  • Plot of IR brightness over time suggesting a collision of asteroids near star NGC 2547-0ID8 (2012–2013)
  • Infrared image of NGC 2547 taken with the Spitzer Space Telescope. Below the center HD 68478 and the shell around this star is seen.
  • Wide-field view of NGC 2547, created from DSS2 images.

References
  1. Bravi, L.; Zari, E.; Sacco, G. G.; Randich, S.; Jeffries, R. D.; Jackson, R. J.; Franciosini, E.; Moraux, E.; López-Santiago, J.; Pancino, E.; Spina, L. (July 2018). "The Gaia-ESO Survey: a kinematical and dynamical study of four young open clusters". Astronomy & Astrophysics. 615: A37. arXiv:1803.01908. Bibcode:2018A&A...615A..37B. doi:10.1051/0004-6361/201832645. ISSN 0004-6361. S2CID 119494247.
  2. "Full name of NGC discoverers". NASA/IPAC Extragalactic Database. Archived from the original on 28 February 2011. Retrieved 5 September 2014.
  3. [email protected]. "Young, Hot and Blue - Stars in the cluster NGC 2547". www.eso.org. Retrieved 2020-01-22.
  4. Young, E. T.; Lada, C. J.; Teixeira, P.; Muzerolle, J.; Muench, A.; Stauffer, J.; Beichman, C. A.; Rieke, G. H.; Hines, D. C.; Su, K. Y. L.; Engelbracht, C. W. (September 2004). "Spitzer Observations of NGC 2547: The Disk Population at 25 Million Years". The Astrophysical Journal Supplement Series. 154 (1): 428. Bibcode:2004ApJS..154..428Y. doi:10.1086/422688. ISSN 0067-0049.
  5. Beccari, Giacomo; Boffin, Henri M. J.; Jerabkova, Tereza; Wright, Nicholas J.; Kalari, Venu M.; Carraro, Giovanni; De Marchi, Guido; de Wit, Willem-Jan (November 2018). "A sextet of clusters in the Vela OB2 region revealed by Gaia" (PDF). MNRAS. 481 (1): L11–L15. Bibcode:2018MNRAS.481L..11B. doi:10.1093/mnrasl/sly144. ISSN 0035-8711. S2CID 118974910.
  6. "[BBJ2018] 6". sim-basic. Retrieved 2020-01-22.
  7. Cantat-Gaudin, T.; Mapelli, M.; Balaguer-Núñez, L.; Jordi, C.; Sacco, G.; Vallenari, A. (January 2019). "A ring in a shell: the large-scale 6D structure of the Vela OB2 complex". Astronomy & Astrophysics. 621: A115. arXiv:1808.00573. Bibcode:2019A&A...621A.115C. doi:10.1051/0004-6361/201834003. ISSN 0004-6361. S2CID 119071750.
  8. Littlefair, S. P.; Naylor, Tim; Jeffries, R. D.; Devey, C. R.; Vine, S. (November 2003). "Mass segregation in the young open cluster NGC 2547". MNRAS. 345 (4): 1205–1211. Bibcode:2003MNRAS.345.1205L. doi:10.1046/j.1365-2966.2003.07035.x. ISSN 0035-8711.
  9. Gorlova, N.; Balog, Z.; Rieke, G. H.; Muzerolle, J.; Su, K. Y. L.; Ivanov, V. D.; Young, E. T. (November 2007). "Debris Disks in NGC 2547*". The Astrophysical Journal. 670 (1): 516–535. arXiv:0707.2827. Bibcode:2007ApJ...670..516G. doi:10.1086/521671. ISSN 0004-637X. S2CID 7581125.
  10. Meng, Huan Y. A.; Su, Kate Y. L.; Rieke, George H.; Stevenson, David J.; Plavchan, Peter; Rujopakarn, Wiphu; Lisse, Carey M.; Poshyachinda, Saran; Reichart, Daniel E. (August 2014). "Large impacts around a solar-analog star in the era of terrestrial planet formation" (PDF). Science. 345 (6200): 1032–1035. Bibcode:2014Sci...345.1032M. doi:10.1126/science.1255153. ISSN 0036-8075. PMID 25170148. S2CID 206558302.
  11. Forbrich, Jan; Lada, Charles J.; Muench, August A.; Teixeira, Paula S. (November 2008). "New M Dwarf Debris Disk Candidates in NGC 2547". The Astrophysical Journal. 687 (2): 1107–1116. arXiv:0807.3597. Bibcode:2008ApJ...687.1107F. doi:10.1086/592035. ISSN 0004-637X. S2CID 119215678.
  12. Silverberg, Steven M.; Wisniewski, John P.; Kuchner, Marc J.; Lawson, Kellen D.; Bans, Alissa S.; Debes, John H.; Biggs, Joseph R.; Bosch, Milton K. D.; Doll, Katharina; Luca, Hugo A. Durantini; Enachioaie, Alexandru (2020-01-14). "Peter Pan Disks: Long-lived Accretion Disks Around Young M Stars". The Astrophysical Journal. 890 (2): 106. arXiv:2001.05030. doi:10.3847/1538-4357/ab68e6. S2CID 210718358.
  13. Teixeira, Paula S.; Lada, Charles J.; Wood, Kenneth; Robitaille, Thomas P.; Luhman, Kevin L. (July 2009). "Infrared Spectrograph Characterization of a Debris Disk Around an M-Type Star in NGC 2547". Astrophysical Journal. 700 (1): 454–459. arXiv:0905.2469. Bibcode:2009ApJ...700..454T. doi:10.1088/0004-637X/700/1/454. ISSN 0004-637X. S2CID 8231130.


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