In apparent brightness it ranks, within Orion, admitting the higher published mean brightness of much more variable stars ranked above it, 35th.[citation needed]
Chi1 Orionis is an unrelated, yellow, main sequence star over two degrees away.
Spectrumedit
χ2 Orionis has a B2 bright supergiant spectrum and is one of the standard B2 Ia stars.[7] It has been reported as having unusually narrow absorption lines and some weak emission lines and was included as one of the original Be stars.[8] It is no longer treated as a Be star since many supergiants show some emission features at high resolution and Be stars is usually defined to exclude supergiants.[9]
χ2 Orionis was listed as having likely small amplitude variability in photometry for the Third Catalogue of Stars measured in the Geneva Observatory Photometric System, specifically varying by 22 thousandths of a magnitude.[11] It was included in the General Catalogue of Variable Stars based on Hipparcos satellite photometry with a magnitude range (in the Hipparchos photometric system) of 4.68 - 4.72 and a period of 2.8 days.[12] A detailed study of the Hipparcos photometry confirmed the star as an α Cyg variable and gave the amplitude of variation as 0.057 magnitudes.[13]
Referencesedit
^ abcdeVallenari, 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.
^ abcdefghiCrowther, P. A.; Lennon, D. J.; Walborn, N. R. (2006). "Physical parameters and wind properties of galactic early B supergiants". Astronomy and Astrophysics. 446: 279–293. arXiv:astro-ph/0509436. Bibcode:2006A&A...446..279C. doi:10.1051/0004-6361:20053685. S2CID 18815761.
^ abcdHR 2135, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line January 14, 2011.
^khi 2 Ori, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars 2017-06-20 at the Wayback Machine, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line January 14, 2011.
^ abTetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
^Garrison, R. F. (December 1993), , Bulletin of the American Astronomical Society, 25: 1319, Bibcode:1993AAS...183.1710G, archived from the original on 2019-06-25, retrieved 2012-02-04
^Merrill, P. W.; Humason, M. L.; Burwell, C. G. (1925). "Discovery and Observations of Stars of Class Be". Astrophysical Journal. 61: 389. Bibcode:1925ApJ....61..389M. doi:10.1086/142899.
^Andrillat, Y.; Jaschek, M.; Jaschek, C. (1994). "A study of Be stars in the wavelength region around Paschen 7". Astronomy and Astrophysics Supplement Series. 103. Bibcode:1994A&AS..103..135A.
^"Light Curve". Hipparcos ESA. ESA. Retrieved 11 August 2022.
^Rufener, F.; Bartholdi, P. (1982). "List of 333 variable, microvariable or suspected variable stars detected in the Geneva photometry". Astronomy and Astrophysics Supplement Series. 48: 503. Bibcode:1982A&AS...48..503R.
^Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars. 4659: 1. Bibcode:1999IBVS.4659....1K.
^Lefèvre, L.; Marchenko, S. V.; Moffat, A. F. J.; Acker, A. (2009). "A systematic study of variability among OB-stars based on HIPPARCOS photometry". Astronomy and Astrophysics. 507 (2): 1141. Bibcode:2009A&A...507.1141L. doi:10.1051/0004-6361/200912304.
January 01, 1970
chi2, orionis, other, stars, with, this, bayer, designation, orionis, chi2, orionis, type, supergiant, star, constellation, orion, apparent, visual, magnitude, being, quite, distant, heavily, extinguished, burns, with, greatest, absolute, visual, light, magnit. For other stars with this Bayer designation see x Orionis Chi2 Orionis Chi2 Ori x2 Orionis x2 Ori k aɪ t uː ˈ ɒ r aɪ is a B type supergiant star in the constellation of Orion It has an apparent visual magnitude of 4 63 but being quite distant and heavily extinguished it burns with the greatest absolute visual light magnitude among stars in Orion within the near reaches of the galaxy 0 9 of a magnitude brighter than Rigel citation needed Since 1943 the spectrum of this star has served as one of the stable anchor points by which other stars are classified It is considered to be a member of the Gemini OB1 association 2 x2 OrionisLocation of x2 Orionis circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Orion Right ascension 06h 03m 55 18437s 1 Declination 20 08 18 4281 1 Apparent magnitude V 4 63 2 3 Characteristics Spectral type B2Ia 2 U B color index 0 68 3 B V color index 0 28 3 R I color index 0 22 3 Variable type a Cyg 4 AstrometryRadial velocity Rv 16 8 0 9 5 km sProper motion m RA 2 679 1 mas yr Dec 2 500 1 mas yrParallax p 0 7636 0 1219 mas 1 Distanceapprox 4 300 ly approx 1 300 pc Absolute magnitude MV 7 6 2 DetailsMass42 3 1 0 6 M Radius61 9 2 R Luminosity446 000 2 L Surface gravity log g 2 35 2 cgsTemperature19 000 2 KRotational velocity v sin i 72 2 km sAge5 0 6 6 Myr Other designationsx2 Ori Chi2 Orionis Chi2 Ori 62 Orionis 62 Ori BD 20 1233 GC 7675 HD 41117 HIP 28716 HR 2135 PPM 95316 SAO 77911 Database referencesSIMBADdata In apparent brightness it ranks within Orion admitting the higher published mean brightness of much more variable stars ranked above it 35th citation needed Chi1 Orionis is an unrelated yellow main sequence star over two degrees away Spectrum editx2 Orionis has a B2 bright supergiant spectrum and is one of the standard B2 Ia stars 7 It has been reported as having unusually narrow absorption lines and some weak emission lines and was included as one of the original Be stars 8 It is no longer treated as a Be star since many supergiants show some emission features at high resolution and Be stars is usually defined to exclude supergiants 9 Variability edit nbsp A light curve for Chi2 Orionis plotted from Hipparcos data 10 x2 Orionis was listed as having likely small amplitude variability in photometry for the Third Catalogue of Stars measured in the Geneva Observatory Photometric System specifically varying by 22 thousandths of a magnitude 11 It was included in the General Catalogue of Variable Stars based on Hipparcos satellite photometry with a magnitude range in the Hipparchos photometric system of 4 68 4 72 and a period of 2 8 days 12 A detailed study of the Hipparcos photometry confirmed the star as an a Cyg variable and gave the amplitude of variation as 0 057 magnitudes 13 References edit a b c d e 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 c d e f g h i Crowther P A Lennon D J Walborn N R 2006 Physical parameters and wind properties of galactic early B supergiants Astronomy and Astrophysics 446 279 293 arXiv astro ph 0509436 Bibcode 2006A amp A 446 279C doi 10 1051 0004 6361 20053685 S2CID 18815761 a b c d HR 2135 database entry The Bright Star Catalogue 5th Revised Ed Preliminary Version D Hoffleit and W H Warren Jr CDS ID V 50 Accessed on line January 14 2011 khi 2 Ori database entry The combined table of GCVS Vols I III and NL 67 78 with improved coordinates General Catalogue of Variable Stars Archived 2017 06 20 at the Wayback Machine Sternberg Astronomical Institute Moscow Russia Accessed on line January 14 2011 Wilson Ralph Elmer 1953 General catalogue of stellar radial velocities Carnegie Institution of Washington Bibcode 1953GCRV C 0W a b Tetzlaff N Neuhauser R Hohle M M 2011 A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun Monthly Notices of the Royal Astronomical Society 410 190 200 arXiv 1007 4883 Bibcode 2011MNRAS 410 190T doi 10 1111 j 1365 2966 2010 17434 x S2CID 118629873 Garrison R F December 1993 Anchor Points for the MK System of Spectral Classification Bulletin of the American Astronomical Society 25 1319 Bibcode 1993AAS 183 1710G archived from the original on 2019 06 25 retrieved 2012 02 04 Merrill P W Humason M L Burwell C G 1925 Discovery and Observations of Stars of Class Be Astrophysical Journal 61 389 Bibcode 1925ApJ 61 389M doi 10 1086 142899 Andrillat Y Jaschek M Jaschek C 1994 A study of Be stars in the wavelength region around Paschen 7 Astronomy and Astrophysics Supplement Series 103 Bibcode 1994A amp AS 103 135A Light Curve Hipparcos ESA ESA Retrieved 11 August 2022 Rufener F Bartholdi P 1982 List of 333 variable microvariable or suspected variable stars detected in the Geneva photometry Astronomy and Astrophysics Supplement Series 48 503 Bibcode 1982A amp AS 48 503R Kazarovets E V Samus N N Durlevich O V Frolov M S Antipin S V Kireeva N N Pastukhova E N 1999 The 74th Special Name list of Variable Stars Information Bulletin on Variable Stars 4659 1 Bibcode 1999IBVS 4659 1K Lefevre L Marchenko S V Moffat A F J Acker A 2009 A systematic study of variability among OB stars based on HIPPARCOS photometry Astronomy and Astrophysics 507 2 1141 Bibcode 2009A amp A 507 1141L doi 10 1051 0004 6361 200912304 Retrieved from https en wikipedia org w index php title Chi2 Orionis amp oldid 1170447426, wikipedia, wiki, book, books, library,
