Sh2-54

Sh2-54
Observation data: J2000 epoch
Type Emission
Right ascension 18h 17m 53s[1]
Declination −11° 40′ 58″[1]
Distance 6,200 ly[2]
Apparent magnitude (V) -
Apparent dimensions (V) 140 arcmins[3]
Constellation Serpens
Physical characteristics
Other designations RCW 167, Gum 84/85, W35, LBN 72[1]
See also: Diffuse nebula, Lists of nebulae

Sh2-54 is an extended bright nebula in the constellation of Serpens.[1]

In its core there are many protostars and many infrared sources; some of these sources, like IRAS 18151−1208, are most probably very young high-mass stars.[4] The older star population in this region has an average age of 4-5 millions years, and its components are grouped in the open cluster NGC 6604.[2]

Sh2-54 belongs to an extended nebulosity that includes also the Eagle Nebula and the Omega Nebula.[5] The young high-mass stars of this region constitute the Serpens OB1 and Serpens OB2 OB association.[2]

See also

References

  1. ^ a b c d "SIMBAD Astronomical Database". Results for Sh2-54. http://simbad.u-strasbg.fr/Simbad. Retrieved 2011-06-05. 
  2. ^ a b c Reipurth, B. (December 2008). "The Young Cluster NGC 6604 and the Serpens OB2 Association". Handbook of Star Forming Regions, Volume II: the Southern Sky 5: 590. Bibcode 2008hsf2.book..590R. 
  3. ^ Sharpless, Stewart (December 1959). "A Catalogue of H II Regions.". Astrophysical Journal Supplement 4: 257. Bibcode 1959ApJS....4..257S. doi:10.1086/190049. 
  4. ^ Davis, C. J.; Varricatt, W. P.; Todd, S. P.; Ramsay Howat, S. K. (October 2004). "Collimated molecular jets from high-mass young stars: IRAS 18151-1208". Astronomy and Astrophysics 425 (3): 981–995. Bibcode 2004A&A...425..981D. doi:10.1051/0004-6361:20041298. 
  5. ^ Sofue, Y.; Handa, T.; Fuerst, E.; Reich, W.; Reich, P. (1986). "Giant stellar-wind shell associated with the H II region M16". Astronomical Society of Japan 38: 347–360. Bibcode 1986PASJ...38..347S. 

External links

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See also: Gum Nebula

Coordinates: 18h 17m 53s, +11° 40′ 58″