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NGC 3766

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NGC 3766
NGC 3766 image taken with the MPG/ESO 1.2-metre telescope at the La Silla Observatory[1]
Credit: ESO
Observation data (J2000 epoch)
Right ascension11h 36m 14.6s[2]
Declination−61° 36′ 58″[2]
Distance6.66 kly (2.041 kpc)[2]
Apparent magnitude (V)5.3[3]
Apparent dimensions (V)15′[3]
Physical characteristics
Radius9.6 ly[citation needed]
Estimated age25.7 Myr[3]
Easy to view via binoculars or telescope
Other designationsNGC 3766, C 97, Collinder 248, Melotte 107, Dunlop 289, Lacaille III.7, C1133-613
Associations
ConstellationCentaurus[3]
See also: Open cluster, List of open clusters
Map showing the location of NGC 3766.

NGC 3766 (also known as Caldwell 97) is an open star cluster in the southern constellation Centaurus.[3] It is located in the vast star-forming region known as the Carina molecular cloud, and was discovered by Nicolas Louis de Lacaille during his astrometric survey in 1751–1752.[4] At a distance of about 1745 pc,[5] the cluster subtends a diameter of about 12 minutes of arc.[6]

There are 137 listed stars, but many are likely non-members, with only 36 having accurate photometric data.[7] It has a total apparent magnitude of 5.3 and integrated spectral type of B1.7.[5] NGC 3766 is relatively young, with an estimated age of log (7.160) or 14.4 million years,[6] and is approaching us at 14.8 km/s.[5] This cluster contains eleven Be stars, two red supergiants and four Ap stars.[7]

36 examples of an unusual type of variable star were discovered in the cluster. These fast-rotating pulsating B-type stars vary by only a few hundredths of a magnitude with periods less than half a day. They are main sequence stars, hotter than δ Scuti variables and cooler than slowly pulsating B stars.[8]

See also

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References

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  1. ^ "New Kind of Variable Star Discovered". ESO Press Release. Retrieved 14 June 2013.
  2. ^ a b c Tarricq, Y.; et al. (2021). "3D kinematics and age distribution of the open cluster population". Astronomy and Astrophysics. 647: A19. arXiv:2012.04017. Bibcode:2021A&A...647A..19T. doi:10.1051/0004-6361/202039388.
  3. ^ a b c d e Finlay, Warren H. (2014). Concise Catalogue of Deep-Sky Objects. The Patrick Moore Practical Astronomy Series (2nd ed.). Springer Cham. p. 266. doi:10.1007/978-3-319-03170-5. ISBN 978-3-319-03169-9.
  4. ^ Jones, K. G. (March 1969). "The search for the nebulae - VI". Journal of the British Astronomical Association. 79: 213–222. Bibcode:1969JBAA...79..213J.
  5. ^ a b c "NGC 3766". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2013-06-13.
  6. ^ a b "WEBDA Astronomical Database". WEBDA Page for NGC 3766. Retrieved 2013-06-13.
  7. ^ a b "Webda Astronomical Database". WEBDA Page for NGC 3766a. Retrieved 2013-06-13.
  8. ^ Saio, H; Ekström, S; Mowlavi, N; Georgy, C; Saesen, S; Eggenberger, P; Semaan, T; Salmon, S. J. A. J (2017). "Period–luminosity relations of fast-rotating B-type stars in the young open cluster NGC 3766". Monthly Notices of the Royal Astronomical Society. 467 (4): 3864. arXiv:1702.02306. Bibcode:2017MNRAS.467.3864S. doi:10.1093/mnras/stx346.
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