| 释义 |
- Nomenclature
- Properties
- References
{{Starbox begin
| name = Alpha Columbae
}}{{Starbox image
| image =
| caption=Location of α Columbae (circled)
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Columba
| ra = {{RA|05|39|38.94103}}
| dec = {{DEC|−34|04|26.7950}}
| appmag_v=2.645[3]
}}{{Starbox character
| class = B7 IV[4]
| u-b = −0.44[3]
| b-v = −0.125[3]
| r-i = −0.09[7]
}}{{Starbox astrometry
| radial_v = +35.0[8]
| prop_mo_ra = −1.58
| prop_mo_dec = −24.82
| parallax = 12.48
| p_error = 0.36
| parallax_footnote =
| absmag_v= −1.87[12]
}}{{Starbox detail
| radius = 5.8[13]
| mass= 4.5[14]
| temperature=12,963[13]
| gravity=3.73[13]
| luminosity_bolometric=1,000[14]
| rotational_velocity=176[18]
| age_myr=
}}{{Starbox catalog
| names=Alpha Columbae, α Col, CCDM J05396−3404 A, CD−34 2375, CPD−34 703, FK5 215, GC 7078, HD 37795, HIP 26634, HR 1956, NSV 2549, PPM 281732, SAO 196059.[19]
}}{{Starbox reference
| Simbad=alf+Col
}}{{Starbox end}}Alpha Columbae (α Columbae, abbreviated Alpha Col, α Col), also named Phact,[1] is a third magnitude star in the southern constellation of Columba. It has an apparent visual magnitude of 2.6,[3] making it the brightest member of Columba. Based upon parallax measurements made during the Hipparcos mission, Alpha Columbae is located at a distance of around {{Convert|261|ly|pc|abbr=off|lk=on}}. Nomenclature Alpha Columbae is the star's Bayer designation. The traditional name of Phact (also Phad, Phaet, Phakt[23]) derives from the Arabic ألفاجتة - fākh(i)tah [fa:x(i)ta] meaning 'ring dove'. It was originally applied to the constellation Cygnus as al-Fākhtah, but later transferred to this star.[2][3][4][5] The etymology of its name hadāri (unknown meaning)[6] has also been suggested. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[7] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[8] included a table of the first two batches of names approved by the WGSN; which included Phact for this star. In Chinese, {{lang|zh|丈人}} ({{lang|zh-Latn|Zhàng Rén}}), meaning Grandfather, refers to an asterism consisting of α Columbae and ε Columbae.[9] Consequently, α Columbae itself is known as {{lang|zh|丈人一}} ({{lang|zh-Latn|Zhàng Rén yī}}, {{lang-en|the First Star of Grandfather}}.).[10] From this Chinese name, the name Chang Jin has appeared[11] Properties This is believed to be a solitary star,[18][35] although it has a faint optical companion at an angular separation of 13.5 arcseconds, making it a double star.[36] The stellar classification of Alpha Columbae is B7 IV,[4] with the luminosity class of IV indicating it has evolved into a subgiant star. The spectrum shows it to be a Be star surrounded by a hot gaseous disk, which is generating emission lines because of hydrogen recombination.[23] Like most if not all such stars, it is rotating rapidly with a projected rotational velocity of {{nowrap|176 km s−1}}. The azimuthal equatorial velocity may be {{nowrap|457 km s−1}}.[18] It is a suspected Gamma Cassiopeiae type (GCAS) variable star, with its apparent magnitude varying from 2.62m to 2.66m. References1. ^{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt | title=IAU Catalog of Star Names |accessdate=28 July 2016}}
2. ^{{cite book |author= Davis, Jr. G. A. |date = 1971 |title = Pronunciations, Derivations, and Meanings of a Selected List of Star Names |edition = Reprint |publisher = Sky Pub. Corp |location = Cambridge, MA |page = 11}}
3. ^{{cite book |author= Kunitzsch, P. |date = 1959 |title = Arabische Sternnamen in Europa |publisher = Otto Harrassowitz |location = Wiesbaden |pages = 191–192}}
4. ^{{cite book |author= Laffitte, R. |date = 2005 |title = Héritages arabes: Des noms arabes pour les étoiles |edition = 2éme revue et corrigée |publisher = Librairie Orientaliste Paul Geunthner / Les Cahiers de l'Orient |location = Paris |page = 223}}
5. ^{{cite book |author= Kunitzsch, P. |author2= Smart, T. |last-author-amp= yes |date = 2006 |title = A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations |edition = 2nd rev. |publisher = Sky Pub |location = Cambridge, MA |isbn = 978-1-931559-44-7 |page = 30}}
6. ^{{cite book |author= Allen, R. H. |author-link= Richard Hinckley Allen |date = 1963 |title = Their Lore and Meaning |edition = Reprint |publisher = Dover Publications Inc. |location = New York, NY |isbn = 0-486-21079-0 |page = 167}}
7. ^{{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}}
8. ^{{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}}
9. ^{{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}}.
10. ^{{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/20110130063024/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_n_r.htm |date=2011-01-30 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.
11. ^Richard Hinckley Allen: Star Names — Their Lore and Meaning: Columbae
12. ^1 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
13. ^1 2 3 {{citation | last1=Meilland | first1=A. | last2=Stee | first2=Ph. | last3=Chesneau | first3=O. | last4=Jones | first4=C. | title=VLTI/MIDI observations of 7 classical Be stars | journal=Astronomy and Astrophysics | volume=505 | issue=2 | pages=687–693 |date=October 2009 | doi=10.1051/0004-6361/200911960 | bibcode=2009A&A...505..687M |arxiv = 0908.1239 }}
14. ^1 2 3 4 {{citation | title=UBV Photometry of Some Very Bright Stars | last1=Cousins | first1=A. W. J. | journal=Monthly Notes of the Astronomical Society of Southern Africa | volume=31 | page=69 | date=1972 | bibcode=1972MNSSA..31...69C }}
15. ^1 2 {{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=3 | last1=Houk | first1=Nancy | publication-place=Ann Arbor, Michigan | publisher=Dept. of Astronomy, University of Michigan | date=1979 | bibcode=1982mcts.book.....H }}
16. ^1 {{cite book | last=Wilson | first=R. E. | date=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institute of Washington D.C. | bibcode=1953GCRV..C......0W }}
17. ^1 {{cite journal | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 |date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E |arxiv = 0806.2878 }}
18. ^1 2 3 {{citation | display-authors=1 | last1=Oudmaijer | first1=R. D. | last2=Parr | first2=A. M. | last3=Baines | first3=D. | last4=Porter | first4=J. M. | title=Sub-milliarcsecond precision spectro-astrometry of Be stars | journal=Astronomy and Astrophysics | volume=489 | issue=2 | pages=627–631 |date=October 2008 | doi=10.1051/0004-6361:20079117 | bibcode=2008A&A...489..627O |arxiv = 0807.3673 }}
19. ^1 2 Jim Kaler: Phact - STARS {{webarchive|url=https://web.archive.org/web/20080704204624/http://www.astro.uiuc.edu/~kaler/sow/phact.html |date=2008-07-04 }}. Accessed on line April 21, 2009.
20. ^1 {{cite simbad|title=alf Col|accessdate=April 21, 2009}}
21. ^1 HR 1956, 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 April 21, 2009.
22. ^1 CCDM J05396-3404, database entry, J. Dommanget and O. Nys (2002) Catalogue of the Components of Double and Multiple Stars, Accessed on line April 21, 2009.
23. ^1 2 Note of HR 1956, 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 April 21, 2009.
}}{{Stars of Columba}} 8 : Bayer objects|B-type subgiants|Columba (constellation)|Stars with proper names|Hipparcos objects|HR objects|Henry Draper Catalogue objects|Durchmusterung objects |