Alpha Chamaeleontis

Alpha Chamaeleontis
	Alpha Chamaeleontis se posisie (in die rooi sirkel).
Sterrebeeld	Kameleon
Spektraaltipe	F5 V Fe-0.8
Soort	Hoofreeksster
	Waarnemingsdata (Epog J2000)
Regte klimming	08h 18m 31.55319s
Deklinasie	-76° 55′ 10.9964″
Skynmagnitude (m)	4,06
Absolute magnitude (M)	+2,59
B-V-kleurindeks	+0,40
U-B-kleurindeks	-0,04
	Besonderhede
Massa (M☉)	1,42
Ligsterkte (L☉)	7,64
Ouderdom (jaar)	1,8 miljard
Temperatuur (K)	6 776
Rotasiespoed (km/s)	0
Metaalinhoud [Fe/H]	-0,26
	Ander name
	α Cha, CPD−76° 507, Gliese 305, HD 71243, HIP 40702, HR 3318, SAO 256496
Portaal	Sterrekunde

Alpha Chamaeleontis (afgekort as α Cha) is die helderste ster in die suidelike sirkumpolêre sterrebeeld Kameleon (Chamaeleon). Dit het ’n skynbare magnitude van 4,06^[3] en kan dus met die blote oog gesien word. Dit is 63,8 ligjare van die Son af.

α Cha is ’n F-tipe hoofreeksster met ’n klassifikasie van F5 V Fe-0,8,^[1] waar "Fe-0,8" ’n onreëlmatige lae voorkoms van yster aandui. Sy massa is 1,4 keer dié van die Son^[5] en sy ligsterkte 7,64 keer^[6] die Son s’n. Sy effektiewe temperatuur is 6 776 K.^[5] Die ster is sowat 1,8 miljard jaar oud^[5] en het ’n rotasiespoed wat te laag is om te meet.^[7]

Verwysings

↑ ^1,0 ^1,1 ^1,2 Gray, R. O. et al. (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): 161–70, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
↑ ^2,0 ^2,1 van Leeuwen, F. (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↑ ^3,0 ^3,1 ^3,2 ^3,3 Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode: 1986EgUBV........0M.
↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
↑ ^5,0 ^5,1 ^5,2 ^5,3 ^5,4 ^5,5 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
↑ ^6,0 ^6,1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
↑ ^7,0 ^7,1 Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), Bibcode: 1970crvs.book.....U.

Eksterne skakels

Hierdie artikel is vertaal uit die Engelse Wikipedia

[Gray2006-1] 1,0 ^1,1 ^1,2 Gray, R. O. et al. (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): 161–70, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.

[vanLeeuwen2007-2] 2,0 ^2,1 van Leeuwen, F. (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.

[Mermilliod1986-3] 3,0 ^3,1 ^3,2 ^3,3 Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode: 1986EgUBV........0M.

[Anderson2012-4] Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.

[David2015-5] 5,0 ^5,1 ^5,2 ^5,3 ^5,4 ^5,5 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.

[Mcdonald2012-6] 6,0 ^6,1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.

[uesugi_fukuda70-7] 7,0 ^7,1 Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory (University of Kyoto), Bibcode: 1970crvs.book.....U.

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