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NU Orionis (HD 37061) is a star system in the Orion constellation. It ionizates the Messier 43 emission nebula.
Due to Rho Cassiopeiae's large distance and inhomogeneous surface, distance measurements using the parallax technique failed to get a value with low uncertainty. The Hipparcos mission give a poorly-constrained parallax of 0.28±0.21 milliarcseconds (d=12,000±8,700 ly), while the Gaia mission give a. Other method had been used
Location
[edit]NU Orionis is within Messier 43, an emission nebula and H II region[1] that is inside the Orion nebula. It is the main star ionizing it, with its radiation sculpting the nebula.[2]
Due to its faint apparent magnitude of 6.9,[3] NU Orionis can't be seen to the unaided eye, requiring a small telescope[4] or binoculars to be seen.[5] Messier 43 itself is magnitude 9, and can be seen with a small telescope. It culminates and is best seen in January.[2]
History of observations
[edit]NU Orionis was first catalogued in the Durchmusterung catalogue as BD-05 1325, in the 19th century. In the 20th century is received its well-known designation HD 37061, from the Henry Draper catalogue.[6]
It was believed to be a single star until 1991, when spectroscopic observations revealed it to be a close binary[7] with an orbital period of about 19 days.[8] Subsequently, the distant companion HD 37061 B was discovered in 1999, at a distance of 470 milliarcseconds.[9] In 2013, evidence of a fourth member, HD 37061 C, was presented,[10] which was confirmed in 2018. This star has a closer distance of 8.6 mas.[11]
Characteristics
[edit]References
[edit]- ^ Thum, C.; Lemke, D.; Fahrbach, U.; Frey, A. (1978-04-01). "M43 - an emission nebula in Orion". Astronomy and Astrophysics. 65: 207–213. Bibcode:1978A&A....65..207T. ISSN 0004-6361.
- ^ a b "Messier 43 - NASA Science". 2017-10-19. Retrieved 2025-03-09.
- ^ Ducati, J. R. (2002-01-01). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog. 2237. Bibcode:2002yCat.2237....0D.
- ^ "★ HD 37061 Aa". Stellar Catalog. Retrieved 2025-03-09.
- ^ Macrobert, Alan (28 July 2006). "Binoculars: Halfway to a Telescope". Sky & Telescope. American Astronomical Society. Retrieved 11 May 2024.
- ^ "HD 37061". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ Morrell, Nidia; Levato, Hugo (1991-04-01). "Spectroscopic Binaries in the Orion OB1 Association". The Astrophysical Journal Supplement Series. 75: 965. Bibcode:1991ApJS...75..965M. doi:10.1086/191556. ISSN 0067-0049.
- ^ Abt, Helmut A.; Wang, Ruyou; Cardona, Octavio (1991-01-01). "Spectroscopic Binaries in the Orion Nebula Cluster". The Astrophysical Journal. 367: 155. Bibcode:1991ApJ...367..155A. doi:10.1086/169611. ISSN 0004-637X.
- ^ Preibisch, Thomas; Balega, Yuri; Hofmann, Karl-Heinz; Weigelt, Gerd; Zinnecker, Hans (1999-12-01). "Multiplicity of the massive stars in the Orion Nebula cluster". New Astronomy. 4: 531–542. Bibcode:1999NewA....4..531P. doi:10.1016/S1384-1076(99)00042-1. ISSN 1384-1076.
- ^ Grellmann, R.; Preibisch, T.; Ratzka, T.; Kraus, S.; Helminiak, K. G.; Zinnecker, H. (2013-02-01). "The multiplicity of massive stars in the Orion Nebula Cluster as seen with long-baseline interferometry". Astronomy and Astrophysics. 550: A82. doi:10.1051/0004-6361/201220192. ISSN 0004-6361.
- ^ GRAVITY Collaboration; Karl, Martina; Pfuhl, Oliver; Eisenhauer, Frank; Genzel, Reinhard; Grellmann, Rebekka; Habibi, Maryam; Abuter, Roberto; Accardo, Matteo; Amorim, António; Anugu, Narsireddy; Ávila, Gerardo; Benisty, Myriam; Berger, Jean-Philippe; Blind, Nicolas (2018-12-01). "Multiple star systems in the Orion nebula". Astronomy and Astrophysics. 620: A116. Bibcode:2018A&A...620A.116G. doi:10.1051/0004-6361/201833575. ISSN 0004-6361.