Ankaa

Ankaa
	Ankaa se ligging (in die rooi sirkel).
Sterrebeeld	Feniks
Spektraaltipe	K0,5 IIIb
Soort	Reusester
	Waarnemingsdata (Epog J2000)
Regte klimming	00h 26m 17.05140s
Deklinasie	-42° 18′ 21.5539″
Skynmagnitude (m)	2,377
Absolute magnitude (M)	0,52
B-V-kleurindeks	+1,092
U-B-kleurindeks	+0,903
	Besonderhede
Radius (R☉)	15
Temperatuur (K)	4 436
Afstand (ligjaar)	85
Metaalinhoud [Fe/H]	-0,73
	Ander name
	Nair al Zaurak, Cymbae, Lucida Cymbae, CD-42°116, FK5 12, GCTP 71.00, HIP 2081, HR 99, HD 2261, LTT 231, SAO 215093
Portaal	Sterrekunde

Ankaa (ook bekend as Alpha Phoenicis of α Phe) is die helderste ster in die sterrebeeld Feniks (Phoenix).

Name[wysig | wysig bron]

Die ster se Bayer-naam is "α Phoenicis". Sy tradisionele naam, "Ankaa", kom van die Arabiese العنقاء al-ʽanqāʼ "die feniks" (na aanleiding van die sterrebeeld se naam).^[7] Middeleeuse Arabiese sterrekundiges het die sterrebeeld "Dau" geskep (waar Feniks is), en dus is ’n ander gewilde naam vir die ster "Nair al Zaurak",^[8] van نائر الزوق nayyir az-zawraq, "die helder (ster) van die boot". Die Latynse vertaling is "Cymbae", van lūcida cymbae.^[8] Die Internasionale Astronomiese Unie se sternaamwerkgroep (WGSN) het in 2016 die naam Ankaa vir die ster goedgekeur.^[9]

Eienskappe[wysig | wysig bron]

Ankaa is ’n spektroskopiese dubbelster met twee komponente wat elke 3 848,8 dae (10,5 jaar) om mekaar wentel.^[10] Die gesamentlike sterreklassifikasie van die stelsel is K0,5 IIIb,^[1] wat ooreenstem met die spektrum van ’n reusester. Dit het ’n skynbare magnitude van 2,4^[3] en word dus effens oorskadu deur sy bure van die 1ste magnitude, Achernar (α Eridani) en Fomalhaut (α Piscis Australis). Volgens parallaksmetings is dit sowat 85 ligjare van die Son af.^[2] Sy radius is omtrent 15 keer dié van die Son.^[5]

Die ster is vermoedelik in die middel van ’n kort maar stabiele heliumverbrandingsfase in sy evolusie, maar sal waarskynlik redelik binnekort sy buitenste lae as ’n planetêre newel wegstoot en ’n witdwerg word.

Verwysings[wysig | wysig bron]

↑ ^1,0 ^1,1 ^1,2 ^1,3 Gray, R. O. et al. (Julie 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, doi:10.1086/504637, Bibcode: 2006AJ....132..161G
↑ ^2,0 ^2,1 ^2,2 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
↑ ^3,0 ^3,1 ^3,2 ^3,3 Gutierrez-Moreno, Adelina et al. (1966), A System of photometric standards, 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode: 1966PDAUC...1....1G
↑ Cardini, D. (Januarie 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics 430: 303–311, doi:10.1051/0004-6361:20041440, Bibcode: 2005A&A...430..303C.
↑ ^5,0 ^5,1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3de ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41
↑ "alf Phe -- Spectroscopic binary", SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Alpha+Phoenicis, besoek op 2012-01-09
↑ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2de hersiene uitg.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
↑ ^8,0 ^8,1 Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, p. 336, https://books.google.com/books?id=5xQuAAAAIAAJ&pg=PA336
↑ "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Besoek op 28 Julie 2016.
↑ Jancart, S. et al. (Oktober 2005), "Astrometric orbits of SB^9 stars", Astronomy and Astrophysics 442 (1): 365–380, doi:10.1051/0004-6361:20053003, Bibcode: 2005A&A...442..365J

Eksterne skakels[wysig | wysig bron]

Hierdie artikel is vertaal uit die Engelse Wikipedia

[aj132_1_161-1] 1,0 ^1,1 ^1,2 ^1,3 Gray, R. O. et al. (Julie 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, doi:10.1086/504637, Bibcode: 2006AJ....132..161G

[aaa474_2_653-2] 2,0 ^2,1 ^2,2 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V

[sps1966-3] 3,0 ^3,1 ^3,2 ^3,3 Gutierrez-Moreno, Adelina et al. (1966), A System of photometric standards, 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode: 1966PDAUC...1....1G

[Cardini2005-4] Cardini, D. (Januarie 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics 430: 303–311, doi:10.1051/0004-6361:20041440, Bibcode: 2005A&A...430..303C.

[lang2006-5] 5,0 ^5,1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3de ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41

[SIMBAD-6] "alf Phe -- Spectroscopic binary", SIMBAD (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Alpha+Phoenicis, besoek op 2012-01-09

[Kunitzsch-7] Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2de hersiene uitg.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.

[allen1899-8] 8,0 ^8,1 Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, p. 336, https://books.google.com/books?id=5xQuAAAAIAAJ&pg=PA336

[WGSN1-9] "Bulletin of the IAU Working Group on Star Names, No. 1" (PDF). Besoek op 28 Julie 2016.

[aaa442_1_365-10] Jancart, S. et al. (Oktober 2005), "Astrometric orbits of SB^9 stars", Astronomy and Astrophysics 442 (1): 365–380, doi:10.1051/0004-6361:20053003, Bibcode: 2005A&A...442..365J

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