- Properties
- References
| name = β Columbae
}}{{Starbox image
| image={{Location mark
|image=Columba constellation map.svg|alt=|float=center|width=240
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=β Col
|x=474|y=508
}}
|caption=Location of β Columbae (circled)
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Columba
| ra = {{RA|05|50|57.5929}}
| dec = {{DEC|−35|46|05.9152}}
| appmag_v = 3.105[3]
}}{{Starbox character
| class = K1 IIICN+1[4]
| u-b = +1.189[3]
| b-v = +1.162[3]
| r-i = +0.58[7]
}}{{Starbox astrometry
| radial_v = +88.9[8]
| prop_mo_ra = +54.77
| prop_mo_dec = 404.20
| parallax = 37.41
| p_error = 0.12
| parallax_footnote =
| absmag_v = +1.01[12]
}}{{Starbox detail
| radius = 11.5[13]
| mass = {{nowrap|1.10 ± 0.20}}[14]
| temperature = 4,545[4]
| luminosity_bolometric = 56[16]
| gravity = 2.62[4]
| metal_fe = 0.11[4]
| age_gyr = 2[19]
}}{{Starbox catalog
| names = 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.[20]
}}{{Starbox reference
| Simbad=bet+col
}}{{Starbox end}}Beta Columbae (β Columbae, abbreviated Beta Col, β Col), also named Wazn,[1] is the second brightest star in the southern constellation of Columba.[19] It has an apparent visual magnitude of 3.1,[3] 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 {{Convert|87.2|ly|pc|abbr=off|lk=on}} from the Sun.
Beta Columbae is the star's Bayer designation. It has the traditional name Wazn (or Wezn) from the Arabic وزن "weight".[7][19] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[2] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[3] included a table of the first two batches of names approved by the WGSN; which included Wazn for this star.
In Chinese, {{lang|zh|子}} ({{lang|zh-Latn|Zǐ}}), meaning Son, refers to an asterism consisting of Beta Columbae and Lambda Columbae.[4] Consequently, Beta Columbae itself is known as {{lang|zh|子二}} ({{lang|zh-Latn|Zǐ èr}}, {{lang-en|the Second Star of Son}}.)[5]
Properties
The spectrum of Beta Columbae matches a stellar classification of K1 IIICN+1,[20] 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.[32] The interferometry-measured angular diameter of this star, after correcting for limb darkening, is {{nowrap|3.99 ± 0.05 mas}},[33] which, at its estimated distance, equates to a physical radius of about 11.5 times the radius of the Sun.[13] Despite having expanded to this radius, Beta Columbae only has about a 10% greater mass than the Sun.[14] The outer envelope of this star is radiating energy at an effective temperature of 4,545 K,[4] resulting an orange[37] hue that is typical of a cool, K-type star.[38]
Beta Columbae has a high proper motion across the celestial sphere[39] and is moving at an unusually large speed of {{nowrap|100 km s−1}} relative to the Sun.[19] 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 {{Convert|1.9|ly|pc|abbr=on}} and Beta Columbae may have perturbed outlying planetesimals within the debris disk surrounding Beta Pictoris.[39]
References
2. ^{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|accessdate=22 May 2016}}
3. ^{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin1.pdf | title=Bulletin of the IAU Working Group on Star Names, No. 1 |accessdate=28 July 2016}}
4. ^{{zh icon}} 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}}.
5. ^{{zh icon}} 香港太空館 - 研究資源 - 亮星中英對照表 {{webarchive|url=https://web.archive.org/web/20100819122914/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_t_z.htm |date=2010-08-19 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.
6. ^1 {{citation | title=Mg II chromospheric radiative loss rates in cool active and quiet stars | last1=Cardini | first1=D. | postscript=. | journal=Astronomy and Astrophysics | volume=430 | pages=303–311 | date=January 2005 | doi=10.1051/0004-6361:20041440 | bibcode=2005A&A...430..303C |arxiv = astro-ph/0409683 }}
7. ^1 {{citation | title=Viewing the Constellations with Binoculars: 250+ Wonderful Sky Objects to See and Explore | series=The Patrick Moore Practical Astronomy Series | first1=Bojan | last1=Kambic |postscript=. | publisher=Springer Science & Business Media | year=2009 | isbn=0387853553 | page=260 | url=https://books.google.com/books?id=3vxLNPNHOcwC&pg=PA260 }}
8. ^1 2 {{citation | display-authors=1 | last1=Stello | first1=D. | last2=Bruntt | first2=H. | last3=Preston | first3=H. | last4=Buzasi | first4=D. | title=Oscillating K Giants with the WIRE Satellite: Determination of Their Asteroseismic Masses | journal=The Astrophysical Journal Letters | volume=674 | issue=1 | date=2008 | pages=L53–L56 | doi=10.1086/528936 | bibcode=2008ApJ...674L..53S |arxiv = 0801.2155 }}
9. ^1 {{citation | display-authors=1 | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | publisher=Veröffentlichungen des Astronomisches Rechen-Institut Heidelberg | volume=35 | date=1999 | bibcode=1999VeARI..35....1W }}
10. ^1 2 3 4 {{citation | display-authors=1 | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=H. | last3=Stock | first3=J. | last4=Torres | first4=C. | last5=Wroblewski | first5=H. | title=A System of photometric standards | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | date=1966 | bibcode=1966PDAUC...1....1G }}
11. ^1 2 3 4 5 {{citation | display-authors=1 | last1=Gray | first1=R. O. | last2=Corbally | first2=C. J. | last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T. | last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E. | last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R. | title=Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample | journal=The Astronomical Journal | volume=132 | issue=1 | pages=161–170 |date=July 2006 | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770 }}
12. ^1 2 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.
13. ^1 2 {{citation | last1=Kalas | first1=Paul | last2=Deltorn | first2=Jean-Marc | last3=Larwood | first3=John | title=Stellar Encounters with the β Pictoris Planetesimal System | journal=The Astrophysical Journal | volume=553 | issue=1 | pages=410–420 |date=May 2001 | doi=10.1086/320632 | bibcode=2001ApJ...553..410K |arxiv = astro-ph/0101364 }}
14. ^1 {{citation | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
15. ^1 2 {{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R*) is given by::
16. ^1 {{citation | last1=Keenan | first1=Philip C. | last2=Yorka | first2=Sandra B. | last3=Wilson | first3=Olin C. | title=Recognition and classification of strong-CN giants | journal=Publications of the Astronomical Society of the Pacific | volume=99 | pages=629–636 |date=July 1987 | doi=10.1086/132025 | bibcode=1987PASP...99..629K }}
17. ^1 {{citation | last1=Mallik | first1=Sushma V. | title=Lithium abundance and mass | journal=Astronomy and Astrophysics | volume=352 | pages=495–507 |date=December 1999 | bibcode=1999A&A...352..495M }}
18. ^1 {{citation |title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=Commonwealth Scientific and Industrial Research Organisation |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |accessdate=2012-01-16 |deadurl=yes |archiveurl=https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=2012-03-10 |df= }}
19. ^1 2 {{SIMBAD link|bet+col|NLTT 15724 -- High proper-motion Star}}, database entry, SIMBAD. Accessed on line September 5, 2008.
20. ^1 2 3 4 {{citation | url=http://stars.astro.illinois.edu/sow/wazn.html | title=Wazn | first1=James B. | last1=Kaler | work=Stars | publisher=University of Illinois | accessdate=2012-01-04 }}
}}{{Stars of Columba}}