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IC 2391

January 01, 1970

IC 2391 (also known as the Omicron Velorum Cluster or Caldwell 85) is an open cluster in the constellation Vela consisting of hot, young, blueish stars, some of which binaries and one of which is a quadruple. Persian astronomer A. a.-R. al-Sufi first described it as "a nebulous star" in c. 964.[2][3] It was re-found by Abbe Lacaille and cataloged as Lac II 5.

IC 2391
Observation data (J2000.0 epoch)
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, Lac II 5
Associations
ConstellationVela
See also: Open cluster, List of open clusters

It is centred about 490 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.

Visual and true members edit

It includes these members:[4]

Name Apparent
magnitude (V)		 Spectral type Distance (LY)
HD 74195 (ο Velorum) 3.63 varies[5] B3/5(V)[6] 496 ± 30.5[7]
HD 74560 (HY Velorum) sp. binary 4.815[8] B3IV[6] 490.4 ± 6.9[9]
HD 74146 (NZ Velorum) sp. binary 5.19[10] B5IV[6] 497.3 ± 7.5[11]
HD 74071 (HW Velorum) 5.44[8] B5V[12] 519.9 ± 7.5[13]
HD 74196 cepheid variable 5.61[10] B9/A0[6] 502 ± 4.1[14]
HD 74535 (KT Velorum) alpha2 CVn variable 5.47[8] B9III(pSi)[6] 421 ± 17.5[15] & radial velocity +14[16] so not a true member
HD 75466 6.27[8] B8V[6] 479 ± 2.8[17]
HD 73952 6.43[8] B8V[6] 483 ± 5.8[18]
HD 74438, youngest known quadruple star.[19][20][21] 7.58[8] A2mA5-A8[6] 472 ± 5.2[22]

The stars' era of formation is similar to open cluster IC 2602 in neighbouring Carina,[23] and has a lithium depletion boundary age of about 50 million years.[24] The latter group averages about the same distance, placed at about 485 light years away.[25]

Argus Association edit

The components formed at about the same time as a nearer group, known as the "Argus Association" which one motion model suggests began in their own nebula cloud. These are in a similar direction, roughly the Vela constellation, within the local galactic arm.[26] The supposed association may chiefly comprise:[26]

Name Constellation Distance Radial velocity
Epsilon Pavonis Pavo 105 −6.7
HD 88955 Vela 100 +7.4
HD 61005 Puppis 119 +22

See also edit

References edit

  1. ^ "IC 2391". sim-id. Retrieved 2020-06-11.
  2. ^ Deep-sky Observer's Handbook: Open and globular clusters, Kenneth Glyn Jones, Webb Society (1979), at p3
  3. ^ The History of Astronomy, 2017, Anne Rooney, at p162
  4. ^ 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.
  5. ^ B.C. Reed, 'Catalog of galactic OB stars', Astronomy Journal, 125, 2531-2533 (2003/May-0)
  6. ^ a b c d e f g h N. Houk, 'Catalogue of two-dimensional spectral types for the HD stars, Vol. 2', Michigan Spectral Survey##, Ann Arbor, Dep. Astron., University of Michigan, 2, 0 (1978)
  7. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  8. ^ a b c d e f Hog E., Fabricius, C., Makarov, V., Urban S., Corbin T., Wycoff, G, Bastian, U, Schwekendiek, P., Wicenec, A., 'The Tycho-2 catalogue of the 2.5 million brightest stars' Astronomy and Astrophysics, volume 355, L27-30 (2000/3-2)
  9. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  10. ^ a b Ducati, J.R., 'Catalogue of Stellar Photometry in Johnson's 11-color system', CDS/ADC Collection of Electronic Catalogues, 2237, 0 (2002)
  11. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  12. ^ Houk, N., Cowley A.P., 'Catalogue of two dimentional spectral types for the HD stars, Vol. 1', Michigan Spectral Survey, Ann Arbor, Dep. Astron., University of Michigan, 1, 0 (1975)
  13. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  14. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  15. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  16. ^ Randich, S. & others, 'The Gaia-ESO Survey: open clusters in Gaia-DR1. A way forward to stellar age calibration.', Astronomy and Astrophysics, volume 612A, 99-99 (2018/4-1)
  17. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  18. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  19. ^ Merle, T. (December 2017). "The Gaia -ESO Survey: double-, triple-, and quadruple-line spectroscopic binary candidates". Astronomy & Astrophysics. 608: A95. arXiv:1707.01720. Bibcode:2017A&A...608A..95M. doi:10.1051/0004-6361/201730442. S2CID 119502806.
  20. ^ 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. arXiv:astro-ph/0611584. Bibcode:2007A&A...461..509P. doi:10.1051/0004-6361:20065756. S2CID 17173564.
  21. ^ Plait, Phil (26 May 2022). . SYFY Official Site. Archived from the original on 27 May 2022. Retrieved 4 June 2022.
  22. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  23. ^ 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.
  24. ^ 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. S2CID 208867491.
  25. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875.
  26. ^ a b 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.

External links edit

 
Wikimedia Commons has media related to IC 2391.
  • Frommert, Harmut (29 March 1998). "Omicron Velorum (IC 2391)". SEDS Messier Database. Students for the Exploration and Development of Space.
  • IC 2391 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
  • "IC 2391". SIMBAD. Centre de données astronomiques de Strasbourg.
  • "Open Cluster". An Atlas of The Universe.


January 01, 1970
2391, also, known, omicron, velorum, cluster, caldwell, open, cluster, constellation, vela, consisting, young, blueish, stars, some, which, binaries, which, quadruple, persian, astronomer, sufi, first, described, nebulous, star, found, abbe, lacaille, cataloge. IC 2391 also known as the Omicron Velorum Cluster or Caldwell 85 is an open cluster in the constellation Vela consisting of hot young blueish stars some of which binaries and one of which is a quadruple Persian astronomer A a R al Sufi first described it as a nebulous star in c 964 2 3 It was re found by Abbe Lacaille and cataloged as Lac II 5 IC 2391Observation data J2000 0 epoch Right ascension08h 40 6mDeclination 53 02 Distance574 ly 176 pc 1 Apparent magnitude V 2 5Apparent dimensions V 50 Physical characteristicsOther designationsCaldwell 85 Cr 191 C 0838 528 Lac II 5AssociationsConstellationVelaSee also Open cluster List of open clusters It is centred about 490 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 Contents 1 Visual and true members 2 Argus Association 3 See also 4 References 5 External linksVisual and true members editIt includes these members 4 Name Apparentmagnitude V Spectral type Distance LY HD 74195 o Velorum 3 63 varies 5 B3 5 V 6 496 30 5 7 HD 74560 HY Velorum sp binary 4 815 8 B3IV 6 490 4 6 9 9 HD 74146 NZ Velorum sp binary 5 19 10 B5IV 6 497 3 7 5 11 HD 74071 HW Velorum 5 44 8 B5V 12 519 9 7 5 13 HD 74196 cepheid variable 5 61 10 B9 A0 6 502 4 1 14 HD 74535 KT Velorum alpha2 CVn variable 5 47 8 B9III pSi 6 421 17 5 15 amp radial velocity 14 16 so not a true member HD 75466 6 27 8 B8V 6 479 2 8 17 HD 73952 6 43 8 B8V 6 483 5 8 18 HD 74438 youngest known quadruple star 19 20 21 7 58 8 A2mA5 A8 6 472 5 2 22 The stars era of formation is similar to open cluster IC 2602 in neighbouring Carina 23 and has a lithium depletion boundary age of about 50 million years 24 The latter group averages about the same distance placed at about 485 light years away 25 Argus Association editThe components formed at about the same time as a nearer group known as the Argus Association which one motion model suggests began in their own nebula cloud These are in a similar direction roughly the Vela constellation within the local galactic arm 26 The supposed association may chiefly comprise 26 Name Constellation Distance Radial velocity Epsilon Pavonis Pavo 105 6 7 HD 88955 Vela 100 7 4 HD 61005 Puppis 119 22See also editOmicron VelorumReferences edit IC 2391 sim id Retrieved 2020 06 11 Deep sky Observer s Handbook Open and globular clusters Kenneth Glyn Jones Webb Society 1979 at p3 The History of Astronomy 2017 Anne Rooney at p162 Platais I Melo C Mermilliod J C Kozhurina Platais V Fulbright J P Mendez 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 amp A 461 509P doi 10 1051 0004 6361 20065756 S2CID 17173564 B C Reed Catalog of galactic OB stars Astronomy Journal 125 2531 2533 2003 May 0 a b c d e f g h N Houk Catalogue of two dimensional spectral types for the HD stars Vol 2 Michigan Spectral Survey Ann Arbor Dep Astron University of Michigan 2 0 1978 Brown A G A et al Gaia collaboration August 2018 Gaia Data Release 2 Summary of the contents and survey properties Astronomy amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR a b c d e f Hog E Fabricius C Makarov V Urban S Corbin T Wycoff G Bastian U Schwekendiek P Wicenec A The Tycho 2 catalogue of the 2 5 million brightest stars Astronomy and Astrophysics volume 355 L27 30 2000 3 2 Vallenari A et al Gaia collaboration 2023 Gaia Data Release 3 Summary of the content and survey properties Astronomy and Astrophysics 674 A1 arXiv 2208 00211 Bibcode 2023A amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR a b Ducati J R Catalogue of Stellar Photometry in Johnson s 11 color system CDS ADC Collection of Electronic Catalogues 2237 0 2002 Vallenari A et al Gaia collaboration 2023 Gaia Data Release 3 Summary of the content and survey properties Astronomy and Astrophysics 674 A1 arXiv 2208 00211 Bibcode 2023A amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR Houk N Cowley A P Catalogue of two dimentional spectral types for the HD stars Vol 1 Michigan Spectral Survey Ann Arbor Dep Astron University of Michigan 1 0 1975 Vallenari A et al Gaia collaboration 2023 Gaia Data Release 3 Summary of the content and survey properties Astronomy and Astrophysics 674 A1 arXiv 2208 00211 Bibcode 2023A amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR Vallenari A et al Gaia collaboration 2023 Gaia Data Release 3 Summary of the content and survey properties Astronomy and Astrophysics 674 A1 arXiv 2208 00211 Bibcode 2023A amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR Brown A G A et al Gaia collaboration August 2018 Gaia Data Release 2 Summary of the contents and survey properties Astronomy amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR Randich S amp others The Gaia ESO Survey open clusters in Gaia DR1 A way forward to stellar age calibration Astronomy and Astrophysics volume 612A 99 99 2018 4 1 Vallenari A et al Gaia collaboration 2023 Gaia Data Release 3 Summary of the content and survey properties Astronomy and Astrophysics 674 A1 arXiv 2208 00211 Bibcode 2023A amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR Vallenari A et al Gaia collaboration 2023 Gaia Data Release 3 Summary of the content and survey properties Astronomy and Astrophysics 674 A1 arXiv 2208 00211 Bibcode 2023A amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR Merle T December 2017 The Gaia ESO Survey double triple and quadruple line spectroscopic binary candidates Astronomy amp Astrophysics 608 A95 arXiv 1707 01720 Bibcode 2017A amp A 608A 95M doi 10 1051 0004 6361 201730442 S2CID 119502806 Platais I Melo C Mermilliod J C Kozhurina Platais V Fulbright J P Mendez R A Altmann M Sperauskas J January 2007 WIYN open cluster study XXVI Improved kinematic membership and spectroscopy of IC 2391 Astronomy amp Astrophysics 461 2 509 522 arXiv astro ph 0611584 Bibcode 2007A amp A 461 509P doi 10 1051 0004 6361 20065756 S2CID 17173564 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 Vallenari A et al Gaia collaboration 2023 Gaia Data Release 3 Summary of the content and survey properties Astronomy and Astrophysics 674 A1 arXiv 2208 00211 Bibcode 2023A amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR 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 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 Ha Emission The Astrophysical Journal 614 1 386 397 arXiv astro ph 0406436 Bibcode 2004ApJ 614 386B doi 10 1086 423485 ISSN 0004 637X S2CID 208867491 Vallenari A et al Gaia collaboration 2023 Gaia Data Release 3 Summary of the content and survey properties Astronomy and Astrophysics 674 A1 arXiv 2208 00211 Bibcode 2023A amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 a b 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 External links edit nbsp Wikimedia Commons has media related to IC 2391 Frommert Harmut 29 March 1998 Omicron Velorum IC 2391 SEDS Messier Database Students for the Exploration and Development of Space IC 2391 on WikiSky DSS2 SDSS GALEX IRAS Hydrogen a X Ray Astrophoto Sky Map Articles and images IC 2391 SIMBAD Centre de donnees astronomiques de Strasbourg Open Cluster An Atlas of The Universe Retrieved from https en wikipedia org w index php title IC 2391 amp oldid 1209968254, wikipedia, wiki, book, books, library,

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