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IC 2391 (also known as the Omicron Velorum Cluster or Caldwell 85) is an open cluster in the constellation Vela. The Persian astronomer Al Sufi may have first described it about 964. It was found by Abbe Lacaille and cataloged as Lac II 5.

IC 2391
Observation data (J2000.0 epoch)
ConstellationVela
Right ascension08h 40.6m
Declination−53° 02′
Distance574 ly (176 pc[1])
Apparent magnitude (V)2.5
Apparent dimensions (V)50′
Physical characteristics
Other designationsCaldwell 85, Cr 191, C 0838-528
See also: Open cluster, List of open clusters

The cluster is about 500 light-years away from Earth and can be seen with the naked eye. It contains about 30 stars with a total visual magnitude of 2.5, spread out along 50 arcminutes. It includes the following naked-eye members:[2]

IC 2391 appears to be about the same age as the open cluster IC 2602,[3] and has a lithium depletion boundary age of about 50 million years.[4] IC 2391 has been closely linked to the Argus Association of co-moving stars. Proposed members of this moving group include Denebola, Epsilon Pavonis, 49 Ceti, HD 61005, and HD 88955.[5]

IC 2391 also includes HD 74438, the youngest known quadruple star.[6][7][8]


See also



References


  1. "IC 2391". sim-id. Retrieved 2020-06-11.
  2. Platais, I; Melo, C; Mermilliod, J. -C; Kozhurina-Platais, V; Fulbright, J. P; Méndez, R. A; Altmann, M; Sperauskas, J (2007). "WIYN open cluster study. XXVI. Improved kinematic membership and spectroscopy of IC 2391". Astronomy and Astrophysics. 461 (2): 509. arXiv:astro-ph/0611584. Bibcode:2007A&A...461..509P. doi:10.1051/0004-6361:20065756. S2CID 17173564.
  3. Stauffer, J.R.; et al. (1997). "Rotational Velocities and Chromospheric/Coronal Activity of Low-Mass Stars in the Young Open Clusters IC 2391 and IC 2602". Astrophysical Journal. 479 (2): 776–791. Bibcode:1997ApJ...479..776S. doi:10.1086/303930.
  4. Navascues, David Barrado y; Stauffer, John R.; Jayawardhana, Ray (2004-10-10). "Spectroscopy of Very Low Mass Stars and Brown Dwarfs in IC 2391: Lithium Depletion and Hα Emission". The Astrophysical Journal. 614 (1): 386–397. arXiv:astro-ph/0406436. Bibcode:2004ApJ...614..386B. doi:10.1086/423485. ISSN 0004-637X.
  5. Malo, Lison; et al. (January 2013), "Bayesian Analysis to Identify New Star Candidates in Nearby Young Stellar Kinematic Groups", The Astrophysical Journal, 762 (2): 50, arXiv:1209.2077, Bibcode:2013ApJ...762...88M, doi:10.1088/0004-637X/762/2/88, S2CID 118497872, 88.
  6. Merle, T. (December 2017). "The Gaia -ESO Survey: double-, triple-, and quadruple-line spectroscopic binary candidates". Astronomy & Astrophysics. 608: A95. doi:10.1051/0004-6361/201730442.
  7. Platais, I.; Melo, C.; Mermilliod, J.-C.; Kozhurina-Platais, V.; Fulbright, J. P.; Méndez, R. A.; Altmann, M.; Sperauskas, J. (January 2007). "WIYN open cluster study: XXVI. Improved kinematic membership and spectroscopy of IC 2391". Astronomy & Astrophysics. 461 (2): 509–522. Bibcode:2007A&A...461..509P. doi:10.1051/0004-6361:20065756.
  8. Plait, Phil (26 May 2022). "A weird four-star system may lead the way to catastrophic supernovae". SYFY Official Site. Archived from the original on 27 May 2022. Retrieved 4 June 2022.


Wikimedia Commons has media related to IC 2391.



На других языках

[de] IC 2391

IC 2391 (auch als Omicron Velorum Cluster bekannt) ist ein galaktischer Offener Sternhaufen im Sternbild Vela am Südsternhimmel. Der Sternenhaufen ist etwa 500 Lichtjahre von der Erde entfernt und hat einen Durchmesser von 9 Lichtjahren. Das Objekt hat eine scheinbare Helligkeit von 2m,6 und einen Durchmesser von 60 Bogenminuten und beinhaltet über 30 Sterne. IC 2391 kann mit bloßem Auge gesehen werden. Der Sternhaufen ist rund 50 Millionen Jahre alt.
- [en] IC 2391

[es] IC 2391

IC 2391 (conocido también como Cúmulo de Ómicron Velorum) es un cúmulo abierto en la constelación de Vela, situado unos 2 grados al norte de la estrella δ Velorum. Se cree que fue el astrónomo persa Abd Al-Rahman Al Sufi quien primero lo describió antes del año 964 d. C. Posteriormente fue encontrado de forma independiente por Nicolas Louis de Lacaille en 1752, siendo catalogado como Lac II.5.[2]

[ru] IC 2391

IC 2391 (также известно как звёздное скопление Омикрон Парусов) — молодое рассеянное звёздное скопление в созвездии Парусов.


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