NGC 1931

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NGC 1931
Reflection nebula
emission nebula
NGC1931HunterWilson.jpg
NGC 1931
Observation data: J2000.0 epoch
Right ascension 5h 31m [1]
Declination +34° 15′ [1]
Distance~7500  ly
Apparent magnitude (V)10.1 [1]
Apparent dimensions (V)7′
Constellation Auriga
See also: Lists of nebulae

NGC 1931 is a reflection and emission nebula and around a young star cluster in the constellation Auriga. The nebula shares similarities to the Orion Nebula as it is a mixed emission-reflection nebula that also contains a small Trapezium of hot young stars. [2] At around 2 million years of age, [3] most of the ongoing star formation in the star cluster is hidden away in the nebula. [4] It is believed that the main ionizing source for the dusty molecular cloud is a single, hot B-type star. [3] The distance from Earth is estimated at 7500 light years. [4]

Contents

History

The German-born English astronomer William Herschel discovered the small reflection nebula in 1793 and noted seeing a few stars in the middle. [5] In 1931, Swedish astronomer Per Collinder included it in his catalog of open star clusters as the "nebulous cluster" Collinder 68. [6] American astronomer Stewart Sharpless cataloged the emission component, which lies outside the center, as Sh 2-237 in 1959. [7]

References

  1. 1 2 3 "NGC 1931". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2008-11-16.
  2. ↑ Ambartsumian, V. A. (1954-01-01). "Multiple Systems of Trapezium type". Communications of the Byurakan Astrophysical Observatory. 15: 3–40. Bibcode:1954CoBAO..15....3A.
  3. 1 2 Lim, Beomdu; Sung, Hwankyung; Bessell, Michael S.; Kim, Jinyoung S.; Hur, Hyeonoh; Park, Byeong-Gon (2015-04-01). "The Sejong Open Cluster Survey (SOS). IV. the Young Open Clusters NGC 1624 and NGC 1931". The Astronomical Journal. 149 (4): 127. arXiv: 1502.00105 . Bibcode:2015AJ....149..127L. doi:10.1088/0004-6256/149/4/127. hdl:1885/14284. ISSN   0004-6256.
  4. 1 2 Dewangan, L. K.; Ojha, D. K.; Zinchenko, I.; Janardhan, P.; Luna, A. (2017-01-01). "Multiwavelength Study of the Star Formation in the S237 H II Region". The Astrophysical Journal. 834 (1): 22. arXiv: 1610.08428 . Bibcode:2017ApJ...834...22D. doi: 10.3847/1538-4357/834/1/22 . ISSN   0004-637X.
  5. ↑ Herschel, William (1802). "Catalogue of 500 New Nebulae, Nebulous Stars, Planetary Nebulae, and Clusters of Stars; With Remarks on the Construction of the Heavens". Philosophical Transactions of the Royal Society of London. 92: 477–528. ISSN   0261-0523. JSTOR   107131.
  6. ↑ Collinder, Per (1931-01-01). "On Structural Properties of Open Galactic Clusters and their Spatial Distribution. Catalog of Open Galactic Clusters". Annals of the Observatory of Lund. 2: B1 –B46. Bibcode:1931AnLun...2....1C.
  7. ↑ Sharpless, Stewart (1959-12-01). "A Catalogue of H II Regions". The Astrophysical Journal Supplement Series. 4: 257. Bibcode:1959ApJS....4..257S. doi:10.1086/190049. ISSN   0067-0049.
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