Beta Columbae

{{Starbox begin

| 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|05.915}}

| appmag_v = 3.105

}}

{{Starbox character

| class = K1 IIICN+1

| u-b = +1.189

| b-v = +1.162

| r-i = +0.58

}}

{{Starbox astrometry

| radial_v = +88.9

| prop_mo_ra = +54.77

| prop_mo_dec = 404.20

| parallax = 37.41

| p_error = 0.12

| parallax_footnote =

| absmag_v = +1.01

}}

{{Starbox detail

| radius = 11.5

| mass = {{nowrap|1.10 ± 0.20}}

| temperature = 4,545

| luminosity_bolometric = 56

| gravity = 2.62

| metal_fe = 0.11

| age_gyr = 2

}}

{{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.

}}

{{Starbox reference

| Simbad=bet+col

}}

Beta Columbae (β Columbae, abbreviated Beta Col, β Col), officially named Wazn {{IPAc-en|'|w|Q|z|@n}},{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt | title=IAU Catalog of Star Names |accessdate=28 July 2016}} is the second-brightest star in the southern constellation of Columba. It has an apparent visual magnitude of 3.1, 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.

Nomenclature

Beta Columbae is the star's Bayer designation. It has the traditional name Wazn (or Wezn) from the Arabic وزن "weight". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN){{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}} to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016{{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}} 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.{{in lang|zh}} 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}}. Consequently, Beta Columbae itself is known as {{lang|zh|子二}} ({{lang|zh-Latn|Zǐ èr}}, {{langx|en|the Second Star of Son}}.){{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_t_z.htm 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.

Properties

The spectrum of Beta Columbae matches a stellar classification of K1 IIICN+1, 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. The interferometry-measured angular diameter of this star, after correcting for limb darkening, is {{nowrap|3.99 ± 0.05 mas}}, which, at its estimated distance, equates to a physical radius of about 11.5 times the radius of the Sun. Despite having expanded to this radius, Beta Columbae only has about a 10% greater mass than the Sun. The outer envelope of this star is radiating energy at an effective temperature of 4,545 K, resulting an orange hue that is typical of a cool, K-type star.

Beta Columbae has a high proper motion across the celestial sphere and is moving at an unusually large speed of {{nowrap|100 km s⁻¹}} relative to the Sun. 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.

References

{{Reflist|30em|refs=

{{citation | first1=F. | last1=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 | s2cid=18759600 }}

{{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 | s2cid=12136256 }}

{{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=978-0387853550 | page=260

| url=https://books.google.com/books?id=3vxLNPNHOcwC&pg=PA260 }}

{{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 | s2cid=15094067 }}

{{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 | journal=Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg | publisher=Veröffentlichungen des Astronomisches Rechen-Institut Heidelberg | volume=35 | date=1999 | page=1 | bibcode=1999VeARI..35....1W }}

{{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 | journal=Publications of the Department of Astronomy University of Chile | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | date=1966 | bibcode=1966PDAUC...1....1G }}

{{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 | s2cid=119476992 }}

[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=2040 HR 2040], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line September 5, 2008.

{{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 | s2cid=10844800 }}

{{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 | issue=2 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | doi-access=free }}

{{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:

: $\begin{align} 2\cdot R_*
& = \frac{(10^{-3}\cdot (26.73\cdot 3.99)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
& \approx 22.9\cdot R_{\bigodot}
\end{align}$

{{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 | doi-access=free }}

{{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 }}

{{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 |url-status=dead |archiveurl=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=2012-03-18 }}

{{SIMBAD link|bet+col|NLTT 15724 -- High proper-motion Star}}, database entry, SIMBAD. Accessed on line September 5, 2008.

{{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 }}

}}

Category:Columba (constellation)

Category:K-type giants