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Beta Columbae

March 11, 2023

Beta Columbae (β Columbae, abbreviated Beta Col, β Col), officially named Wazn /ˈwɒzən/,[12] is the second-brightest star in the southern constellation of Columba.[10] It has an apparent visual magnitude of 3.1,[2] which is bright enough to be viewed with the naked eye even from an urban location. Parallax measurements place it at a distance of about 87.2 light-years (26.7 parsecs) from the Sun.[1]

β Columbae
Location of β Columbae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 50m 57.5929s[1]
Declination −35° 46′ 05.9152″[1]
Apparent magnitude (V) 3.105[2]
Characteristics
Spectral type K1 IIICN+1[3]
U−B color index +1.189[2]
B−V color index +1.162[2]
R−I color index +0.58[4]
Astrometry
Radial velocity (Rv)+88.9[5] km/s
Proper motion (μ) RA: +54.77[1] mas/yr
Dec.: 404.20[1] mas/yr
Parallax (π)37.41 ± 0.12 mas[1]
Distance87.2 ± 0.3 ly
(26.73 ± 0.09 pc)
Absolute magnitude (MV)+1.01[6]
Details
Mass1.10 ± 0.20[7] M☉
Radius11.5[8] R☉
Luminosity (bolometric)56[9] L☉
Surface gravity (log g)2.62[3] cgs
Temperature4,545[3] K
Metallicity [Fe/H]0.11[3] dex
Age2[10] Gyr
Other designations
β Col, Beta Columbae, Beta Col, CD−35 2546, CPD−35 752, FK5 223, GC 7364, HD 39425, HIP 27628, HR 2040, LTT 2392, NLTT 15724, PPM 281952, SAO 196240.[11]
Database references
SIMBADdata

Beta Columbae is the star's Bayer designation. It has the traditional name Wazn (or Wezn) from the Arabic وزن "weight".[4][10] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[14] included a table of the first two batches of names approved by the WGSN; which included Wazn for this star.

In Chinese, 子 (Zǐ), meaning Son, refers to an asterism consisting of Beta Columbae and Lambda Columbae.[15] Consequently, Beta Columbae itself is known as 子二 (Zǐ èr, English: the Second Star of Son.)[16]

Properties

The spectrum of Beta Columbae matches a stellar classification of K1 IIICN+1,[11] where the 'III' luminosity class indicates this is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence of stars like the Sun. The notation 'CN+1' indicates a higher than normal level of cyanogen (CN) absorption in the atmosphere of the star.[17] The interferometry-measured angular diameter of this star, after correcting for limb darkening, is 3.99 ± 0.05 mas,[18] which, at its estimated distance, equates to a physical radius of about 11.5 times the radius of the Sun.[8] Despite having expanded to this radius, Beta Columbae only has about a 10% greater mass than the Sun.[7] The outer envelope of this star is radiating energy at an effective temperature of 4,545 K,[3] resulting an orange[19] hue that is typical of a cool, K-type star.[20]

Beta Columbae has a high proper motion across the celestial sphere[21] and is moving at an unusually large speed of 100 km s−1 relative to the Sun.[10] About 107,200 years ago, it made a close approach to the Beta Pictoris system. The estimated separation of the two stars at this time was around 1.9 ly (0.58 pc) and Beta Columbae may have perturbed outlying planetesimals within the debris disk surrounding Beta Pictoris.[21]

References

  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
  2. ^ a b c d Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publications of the Department of Astronomy University of Chile, Publicaciones Universidad de Chile, Department de Astronomy, 1: 1–17, Bibcode:1966PDAUC...1....1G
  3. ^ a b c d e Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992
  4. ^ a b HR 2040, 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 September 5, 2008.
  5. ^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, Veröffentlichungen des Astronomisches Rechen-Institut Heidelberg, 35: 1, Bibcode:1999VeARI..35....1W
  6. ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv:astro-ph/0409683, Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440, S2CID 12136256.
  7. ^ a b Stello, D.; et al. (2008), "Oscillating K Giants with the WIRE Satellite: Determination of Their Asteroseismic Masses", The Astrophysical Journal Letters, 674 (1): L53–L56, arXiv:0801.2155, Bibcode:2008ApJ...674L..53S, doi:10.1086/528936, S2CID 15094067
  8. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
     
  9. ^ Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M
  10. ^ a b c d Kaler, James B., "Wazn", Stars, University of Illinois, retrieved 2012-01-04
  11. ^ a b NLTT 15724 -- High proper-motion Star, database entry, SIMBAD. Accessed on line September 5, 2008.
  12. ^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
  13. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  14. ^ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Retrieved 28 July 2016.
  15. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  16. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 2010-08-19 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  17. ^ Keenan, Philip C.; Yorka, Sandra B.; Wilson, Olin C. (July 1987), "Recognition and classification of strong-CN giants", Publications of the Astronomical Society of the Pacific, 99: 629–636, Bibcode:1987PASP...99..629K, doi:10.1086/132025
  18. ^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
  19. ^ Kambic, Bojan (2009), Viewing the Constellations with Binoculars: 250+ Wonderful Sky Objects to See and Explore, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 260, ISBN 978-0387853550.
  20. ^ , Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2012-03-18, retrieved 2012-01-16
  21. ^ a b Kalas, Paul; Deltorn, Jean-Marc; Larwood, John (May 2001), "Stellar Encounters with the β Pictoris Planetesimal System", The Astrophysical Journal, 553 (1): 410–420, arXiv:astro-ph/0101364, Bibcode:2001ApJ...553..410K, doi:10.1086/320632, S2CID 10844800

March 11, 2023
beta, columbae, columbae, abbreviated, beta, officially, named, wazn, second, brightest, star, southern, constellation, columba, apparent, visual, magnitude, which, bright, enough, viewed, with, naked, even, from, urban, location, parallax, measurements, place. Beta Columbae b Columbae abbreviated Beta Col b Col officially named Wazn ˈ w ɒ z en 12 is the second brightest star in the southern constellation of Columba 10 It has an apparent visual magnitude of 3 1 2 which is bright enough to be viewed with the naked eye even from an urban location Parallax measurements place it at a distance of about 87 2 light years 26 7 parsecs from the Sun 1 b ColumbaeLocation of b Columbae circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation ColumbaRight ascension 05h 50m 57 5929s 1 Declination 35 46 05 9152 1 Apparent magnitude V 3 105 2 CharacteristicsSpectral type K1 IIICN 1 3 U B color index 1 189 2 B V color index 1 162 2 R I color index 0 58 4 AstrometryRadial velocity Rv 88 9 5 km sProper motion m RA 54 77 1 mas yr Dec 404 20 1 mas yrParallax p 37 41 0 12 mas 1 Distance87 2 0 3 ly 26 73 0 09 pc Absolute magnitude MV 1 01 6 DetailsMass1 10 0 20 7 M Radius11 5 8 R Luminosity bolometric 56 9 L Surface gravity log g 2 62 3 cgsTemperature4 545 3 KMetallicity Fe H 0 11 3 dexAge2 10 GyrOther designationsb Col Beta Columbae Beta Col CD 35 2546 CPD 35 752 FK5 223 GC 7364 HD 39425 HIP 27628 HR 2040 LTT 2392 NLTT 15724 PPM 281952 SAO 196240 11 Database referencesSIMBADdataBeta Columbae is the star s Bayer designation It has the traditional name Wazn or Wezn from the Arabic وزن weight 4 10 In 2016 the International Astronomical Union organized a Working Group on Star Names WGSN 13 to catalog and standardize proper names for stars The WGSN s first bulletin of July 2016 14 included a table of the first two batches of names approved by the WGSN which included Wazn for this star In Chinese 子 Zǐ meaning Son refers to an asterism consisting of Beta Columbae and Lambda Columbae 15 Consequently Beta Columbae itself is known as 子二 Zǐ er English the Second Star of Son 16 Properties EditThe spectrum of Beta Columbae matches a stellar classification of K1 IIICN 1 11 where the III luminosity class indicates this is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence of stars like the Sun The notation CN 1 indicates a higher than normal level of cyanogen CN absorption in the atmosphere of the star 17 The interferometry measured angular diameter of this star after correcting for limb darkening is 3 99 0 05 mas 18 which at its estimated distance equates to a physical radius of about 11 5 times the radius of the Sun 8 Despite having expanded to this radius Beta Columbae only has about a 10 greater mass than the Sun 7 The outer envelope of this star is radiating energy at an effective temperature of 4 545 K 3 resulting an orange 19 hue that is typical of a cool K type star 20 Beta Columbae has a high proper motion across the celestial sphere 21 and is moving at an unusually large speed of 100 km s 1 relative to the Sun 10 About 107 200 years ago it made a close approach to the Beta Pictoris system The estimated separation of the two stars at this time was around 1 9 ly 0 58 pc and Beta Columbae may have perturbed outlying planetesimals within the debris disk surrounding Beta Pictoris 21 References Edit a b c d e f van Leeuwen F November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Gutierrez Moreno Adelina et al 1966 A System of photometric standards Publications of the Department of Astronomy University of Chile Publicaciones Universidad de Chile Department de Astronomy 1 1 17 Bibcode 1966PDAUC 1 1G a b c d e Gray R O et al July 2006 Contributions to the Nearby Stars NStars Project spectroscopy of stars earlier than M0 within 40 pc The Southern Sample The Astronomical Journal 132 1 161 170 arXiv astro ph 0603770 Bibcode 2006AJ 132 161G doi 10 1086 504637 S2CID 119476992 a b HR 2040 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 September 5 2008 Wielen R et al 1999 Sixth Catalogue of Fundamental Stars FK6 Part I Basic fundamental stars with direct solutions Veroeffentlichungen des Astronomischen Rechen Instituts Heidelberg Veroffentlichungen des Astronomisches Rechen Institut Heidelberg 35 1 Bibcode 1999VeARI 35 1W Cardini D January 2005 Mg II chromospheric radiative loss rates in cool active and quiet stars Astronomy and Astrophysics 430 303 311 arXiv astro ph 0409683 Bibcode 2005A amp A 430 303C doi 10 1051 0004 6361 20041440 S2CID 12136256 a b Stello D et al 2008 Oscillating K Giants with the WIRE Satellite Determination of Their Asteroseismic Masses The Astrophysical Journal Letters 674 1 L53 L56 arXiv 0801 2155 Bibcode 2008ApJ 674L 53S doi 10 1086 528936 S2CID 15094067 a b Lang Kenneth R 2006 Astrophysical formulae Astronomy and astrophysics library vol 1 3rd ed Birkhauser ISBN 3 540 29692 1 The radius R is given by 2 R 10 3 26 73 3 99 AU 0 0046491 AU R 22 9 R displaystyle begin aligned 2 cdot R amp frac 10 3 cdot 26 73 cdot 3 99 text AU 0 0046491 text AU R bigodot amp approx 22 9 cdot R bigodot end aligned Mallik Sushma V December 1999 Lithium abundance and mass Astronomy and Astrophysics 352 495 507 Bibcode 1999A amp A 352 495M a b c d Kaler James B Wazn Stars University of Illinois retrieved 2012 01 04 a b NLTT 15724 High proper motion Star database entry SIMBAD Accessed on line September 5 2008 IAU Catalog of Star Names Retrieved 28 July 2016 IAU Working Group on Star Names WGSN Retrieved 22 May 2016 Bulletin of the IAU Working Group on Star Names No 1 PDF Retrieved 28 July 2016 in Chinese 中國星座神話 written by 陳久金 Published by 台灣書房出版有限公司 2005 ISBN 978 986 7332 25 7 in Chinese 香港太空館 研究資源 亮星中英對照表 Archived 2010 08 19 at the Wayback Machine Hong Kong Space Museum Accessed on line November 23 2010 Keenan Philip C Yorka Sandra B Wilson Olin C July 1987 Recognition and classification of strong CN giants Publications of the Astronomical Society of the Pacific 99 629 636 Bibcode 1987PASP 99 629K doi 10 1086 132025 Richichi A Percheron I Khristoforova M February 2005 CHARM2 An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 2 773 777 Bibcode 2005A amp A 431 773R doi 10 1051 0004 6361 20042039 Kambic Bojan 2009 Viewing the Constellations with Binoculars 250 Wonderful Sky Objects to See and Explore The Patrick Moore Practical Astronomy Series Springer Science amp Business Media p 260 ISBN 978 0387853550 The Colour of Stars Australia Telescope Outreach and Education Commonwealth Scientific and Industrial Research Organisation December 21 2004 archived from the original on 2012 03 18 retrieved 2012 01 16 a b Kalas Paul Deltorn Jean Marc Larwood John May 2001 Stellar Encounters with the b Pictoris Planetesimal System The Astrophysical Journal 553 1 410 420 arXiv astro ph 0101364 Bibcode 2001ApJ 553 410K doi 10 1086 320632 S2CID 10844800 Retrieved from https en wikipedia org w index php title Beta Columbae amp oldid 1079513698, wikipedia, wiki, book, books, library,

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