Mu Columbae

{{Starbox begin

| name=μ Columbae

}}

{{Starbox image

| image=

{{Location mark

|image=Columba constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=μ Col

|x=516|y=374

}}

|caption=Location of μ Columbae (circled)

}}

{{Starbox observe

| epoch=J2000

| ra={{RA|05|45|59.89502}}

| dec={{DEC|−32|18|23.1623}}

| appmag_v=5.18

| constell=Columba

}}

{{Starbox character

| class=O9.5 V

| b-v=−0.28

| u-b=−1.06

| variable=Suspected

}}

{{Starbox astrometry

| radial_v=+109.00 ± 1.8

| prop_mo_ra=+3.271

| prop_mo_dec={{val|-22.176}}

| pm_footnote=

| parallax=1.7024

| p_error=0.0898

| parallax_footnote=

| dist_ly={{val|{{convert|581|pc|ly|disp=number}}|{{convert|34|pc|ly|disp=number}}|fmt=commas}}

| dist_pc={{val|581|34}}

| dist_footnote=

| absmag_v={{val|-3.78|0.11}}

}}

{{Starbox detail

| source=

| mass={{val|18.9|0.3}}

| radius={{val|6.3|0.4}}

| luminosity={{val|43650|4210|3840|fmt=commas}}

| temperature={{val|33400|300|fmt=commas}}

| gravity={{val|4.12|0.05}}

| metal=

| rotation=

| rotational_velocity={{val|125|8}}

| age_myr=2{{snd}}4

}}

{{Starbox catalog

| names=HR 1996, CD−32°2538, HD 38666, SAO 196149, HIP 27204

}}

{{Starbox reference

|Simbad=mu+Col

}}

Mu Columbae (μ Col, μ Columbae) is a star in the constellation of Columba. It is one of the few O-class stars that are visible to the unaided eye. The star is known to lie approximately 1,900 light years from the Solar System (with an error margin of a few hundred light years).

This is a relatively fast rotating star that completes a full revolution approximately every 1.5 days. (Compare this to the Sun, which at only 22 percent of this star's diameter rotates only once every 25.4 days.) This rate of rotation is fairly typical for stars of this class.

Based on measurements of proper motion and radial velocity, astronomers know that this star and AE Aurigae are moving away from each other at a relative velocity of over 200 km/s. Their common point of origin intersects with Iota Orionis in the Trapezium cluster, some two and half million years in the past. The most likely scenario that could have created these runaway stars is a collision between two binary star systems, with the stars being ejected along different trajectories radial to the point of intersection.

Etymology

In Chinese astronomy, Mu Columbae is called 屎, Pinyin: Shǐ, meaning "Excrement" or "The Secretions", because this star is marking itself and stand alone in the asterism of the same name within the Three Stars mansion.

References

{{reflist|refs=

{{Cite journal |last1=Aschenbrenner |first1=P. |last2=Przybilla |first2=N. |last3=Butler |first3=K. |date=2023-03-01 |title=Quantitative spectroscopy of late O-type main-sequence stars with a hybrid non-LTE method |bibcode=2023A&A...671A..36A |arxiv=2301.09462 |journal=Astronomy and Astrophysics |volume=671 |pages=A36 |doi=10.1051/0004-6361/202244906 |issn=0004-6361}}

{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|last1=Ducati|first1=J. R.|year=2002}}

{{cite journal|bibcode=2014ApJS..211...10S|title=The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars|journal=The Astrophysical Journal Supplement|volume=211|pages=10|last1=Sota|first1=A.|last2=Maíz Apellániz|first2=J.|last3=Morrell|first3=N. I.|last4=Barbá|first4=R. H.|last5=Walborn|first5=N. R.|last6=Gamen|first6=R. C.|last7=Arias|first7=J. I.|last8=Alfaro|first8=E. J.|year=2014|issue=1|doi=10.1088/0067-0049/211/1/10|arxiv = 1312.6222 |s2cid=118847528}}

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite journal|bibcode=2005A&A...441..735M|arxiv=astro-ph/0507278|title=On stars with weak winds: The Galactic case|journal=Astronomy and Astrophysics|volume=441|issue=2|pages=735|last1=Martins|first1=F.|last2=Schaerer|first2=D.|last3=Hillier|first3=D. J.|last4=Meynadier|first4=F.|last5=Heydari-Malayeri|first5=M.|last6=Walborn|first6=N. R.|year=2005|doi=10.1051/0004-6361:20052927|s2cid=11547293}}

{{citation | title=Spectral Atlas for Amateur Astronomers: A Guide to the Spectra of Astronomical Objects and Terrestrial Light Sources | first1=Richard | last1=Walker | publisher=Cambridge University Press | year=2017 | isbn=978-1316738764 | page=23 | url=https://books.google.com/books?id=oQQvDwAAQBAJ&pg=PA23}}

{{cite journal|bibcode=2004MNRAS.350..615G|title=N-body simulations of stars escaping from the Orion nebula|journal=Monthly Notices of the Royal Astronomical Society|volume=350|issue=2|pages=615|last1=Gualandris|first1=Alessia|last2=Portegies Zwart|first2=Simon|last3=Eggleton|first3=Peter P.|year=2004|doi=10.1111/j.1365-2966.2004.07673.x|doi-access=free |arxiv = astro-ph/0401451 |s2cid=119024288}}

{{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|last1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 |s2cid=119231169}}

{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060715.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 15 日] {{Webarchive|url=https://web.archive.org/web/20110716123306/http://aeea.nmns.edu.tw/2006/0607/ap060715.html |date=2011-07-16 }}

[https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Columba_Noae*.html Richard Hinckley Allen: Star Names — Their Lore and Meaning: Columbae]

}}

Mu Columbae

Etymology

References

Further reading