Alfa Kentavra

Alfa Kentavra AB^{[op. 1]}
	; Lega Alfe Kentavra
Opazovalni podatki; Epoha J2000.0 Enakonočje J2000.0
Ozvezdje	Kentaver
	Alpha Centauri A
Rektascenzija	14h 39m 36,49400s
Deklinacija	–60° 50′ 02,3737″
Navidezni sij (V)	+0.01
	Alpha Centauri B
Rektascenzija	14h 39m 35,06311s
Deklinacija	–60° 50′ 15,0992″
Navidezni sij (V)	+1.33
Značilnosti
A
Spektralni razred	G2V
U−B Barvni indeks	+0,24
B−V Barvni indeks	+0,71
B
Spektralni razred	K1V
U−B Barvni indeks	+0,68
B−V Barvni indeks	+0,88
Astrometrija
A
Radialna hitrost (Rv)	−214±076 km/s
Lastno gibanje (μ)	RA: −3679,25 mas/l ; Dec.: 473,67 mas/l
Paralaksa (π)	754,81 ± 4,11 mas
Oddaljenost	4,37 sv. l.
Absolutni izsev (MV)	4,38
B
Radialna hitrost (Rv)	−18,6±1,64 km/s
Lastno gibanje (μ)	RA: −3614,39 mas/l ; Dec.: 802,98 mas/l
Paralaksa (π)	754,81 ± 4,11 mas
Oddaljenost	4,37 sv. l.
Absolutni izsev (MV)	5,71
Podrobnosti
Alpha Centauri A
Masa	1,100 M☉
Polmer	1,2234±0,0053 R☉
Izsev	1,519 L☉
Površinska težnost (log g)	4,30 cgs
Temperatura	5.790 K
Kovinskost [Fe/H]	0,20 dex
Vrtenje	22±5,9 dni
Tirna hitrost(v sin i)	2,7±0,7 km/s
Alpha Centauri B
Masa	0,907 M☉
Polmer	0,8632±0,0037 R☉
Izsev	0,5002 L☉
Površinska težnost (log g)	4,37 cgs
Temperatura	5.260 K
Kovinskost	0,23
Vrtenje	36 days
Tirna hitrost(v sin i)	1,1±0,8 km/s
Starost	5,3±0,3 Ga
Orbita
Primarna	A
Spremljevalka	B
Perioda (P)	79,91±0,011 l
Glavna polos (a)	17,57±0,022″
Izsrednost tira (e)	0,5179±0,00076
Naklon tira (i)	79,205±0,041°
Dolžina vozla (Ω)	204,85±0,084°
Epoha periastrona (T)	1875,66±0,012
Argument periastrona (ω); (sekundarni)	231,65±0,076°
Druge oznake
	Gliese 559, FK5 538, CD−60°5483, CCDM J14396-6050, GC 19728
	α Cen A: Rigil Kentaurus, Rigil Kent, α1 Centauri, HR 5459, HD 128620, GCTP 3309.00, LHS 50, SAO 252838, HIP 71683
	α Cen B: Toliman, α2 Centauri, HR 5460, HD 128621, LHS 51, HIP 71681
Sklici na podatkovne baze
SIMBAD	AB
	[1]
	[2]
Exoplanet Archive	podatki
ARICNS	podatki
Extrasolar Planets; Encyclopaedia	podatki

Alfa Kentavra (α Kentavra / α Cen), znana tudi kot Rigil Kentaurus, Rigil Kent ali Toliman, je najsvetlejša zvezda v južnem ozvezdju Kentavra. Zvezda je dvozvezdje, Alfa Kentavra AB (α Cen AB). Z golim očesom jo vidimo kot eno zvezdo, s svojim navideznim sijem pa je na tretjem mestu najsvetlejših zvezd na nočnem nebu.

Sistem Alfe Kentavra je nabližje Osončju in je oddaljen približno 1,3 parseka, oziroma 4,3 svetlobna leta.

Opombe[uredi | uredi kodo]

↑ Proksima Kentavra je gravitacijsko veznana na sistem α Kentavra, a zaradi praktičnih in zgodovinskih razlogov je opisana v tem članku.

Sklici[uredi | uredi kodo]

↑ ^1,00 ^1,01 ^1,02 ^1,03 ^1,04 ^1,05 ^1,06 ^1,07 ^1,08 ^1,09 Van Leeuwen, F. (2007). »Validation of the new Hipparcos reduction«. Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
↑ ^2,0 ^2,1 ^2,2 ^2,3 ^2,4 ^2,5 Ducati, J. R. (2002). »VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system«. CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
↑ ^3,0 ^3,1 Torres, C. A. O.; Quast, G. R.; da Silva, L .; de la Reza, R.; Melo, C. H. F.; Sterzik, M. (2006). »Search for associations containing young stars (SACY)«. Astronomy and Astrophysics. 460 (3): 695–708. arXiv:astro-ph/0609258. Bibcode:2006A&A...460..695T. doi:10.1051/0004-6361:20065602. ISSN 0004-6361.
↑ ^4,0 ^4,1 Valenti, Jeff A.; Fischer, Debra A. (2005). »Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs«. The Astrophysical Journal Supplement Series. 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi:10.1086/430500. ISSN 0067-0049.
↑ ^5,0 ^5,1 Wilkinson, John (2012). »The Sun and Stars«. New Eyes on the Sun. Astronomers' Universe. str. 219–236. doi:10.1007/978-3-642-22839-1_10. ISBN 978-3-642-22838-4. ISSN 1614-659X.
↑ ^6,0 ^6,1 P. A. Wiegert; M. J. Holman (1997). »The stability of planets in the Alpha Centauri system«. The Astronomical Journal. 113: 1445–1450. arXiv:astro-ph/9609106. Bibcode:1997AJ....113.1445W. doi:10.1086/118360.
↑ ^7,0 ^7,1 ^7,2 ^7,3 ^7,4 ^7,5 ^7,6 ^7,7 Thévenin, F.; Provost, J.; Morel, P.; Berthomieu, G.; Bouchy, F.; Carrier, F. (2002). »Asteroseismology and calibration of alpha Cen binary system«. Astronomy & Astrophysics. 392: L9. arXiv:astro-ph/0206283. Bibcode:2002A&A...392L...9T. doi:10.1051/0004-6361:20021074.
↑ ^8,0 ^8,1 Kervella, P.; Bigot, L.; Gallenne, A.; Thévenin, F. (Januar 2017). »The radii and limb darkenings of α Centauri A and B. Interferometric measurements with VLTI/PIONIER«. Astronomy & Astrophysics. 597. A137. arXiv:1610.06185. Bibcode:2017A&A...597A.137K. doi:10.1051/0004-6361/201629505.
↑ ^9,0 ^9,1 Gilli G.; Israelian G.; Ecuvillon A.; Santos N. C.; Mayor M. (2006). »Abundances of Refractory Elements in the Atmospheres of Stars with Extrasolar Planets«. Astronomy and Astrophysics. 449 (2): 723–36. arXiv:astro-ph/0512219. Bibcode:2006A&A...449..723G. doi:10.1051/0004-6361:20053850. libcode 2005astro.ph.12219G.
↑ ^10,0 ^10,1 Bazot, M.; in sod. (2007). »Asteroseismology of α Centauri A. Evidence of rotational splitting«. Astronomy and Astrophysics. 470 (1): 295–302. arXiv:0706.1682. Bibcode:2007A&A...470..295B. doi:10.1051/0004-6361:20065694.
↑ DeWarf, L.; Datin, K.; Guinan, E. (2010). »X-ray, FUV, and UV Observations of α Centauri B: Determination of Long-term Magnetic Activity Cycle and Rotation Period«. The Astrophysical Journal. 722 (1): 343–357. arXiv:1009.1652. Bibcode:2010ApJ...722..343D. doi:10.1088/0004-637X/722/1/343.
↑ Raassen, A. J. J; Ness, J.-U; Mewe, R; Van Der Meer, R. L. J; Burwitz, V; Kaastra, J. S (2003). »Chandra-LETGS X-ray observation of α Centauri: A nearby (G2V + K1V) binary system«. Astronomy & Astrophysics. 400 (2): 671–678. Bibcode:2003A&A...400..671R. doi:10.1051/0004-6361:20021899.
↑ Joyce, M.; Chaboyer, B. (2018). »Classically and Asteroseismically Constrained 1D Stellar Evolution Models of α Centauri a and B Using Empirical Mixing Length Calibrations«. The Astrophysical Journal. 864 (1): 99. arXiv:1806.07567. Bibcode:2018ApJ...864...99J. doi:10.3847/1538-4357/aad464.
↑ Pourbaix, D.; in sod. (2002). »Constraining the difference in convective blueshift between the components of alpha Centauri with precise radial velocities«. Astronomy and Astrophysics. 386 (1): 280–85. arXiv:astro-ph/0202400. Bibcode:2002A&A...386..280P. doi:10.1051/0004-6361:20020287.

Koordinati: 14^h 39^m 36.4951^s, −60° 50′ 02.308″

Ta o zvezdi članek je škrbina. Pomagajte Wikipediji in ga razširite.

[1] Proksima Kentavra je gravitacijsko veznana na sistem α Kentavra, a zaradi praktičnih in zgodovinskih razlogov je opisana v tem članku.

[hipparcos-2] 1,00 ^1,01 ^1,02 ^1,03 ^1,04 ^1,05 ^1,06 ^1,07 ^1,08 ^1,09 Van Leeuwen, F. (2007). »Validation of the new Hipparcos reduction«. Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.

[ducati-3] 2,0 ^2,1 ^2,2 ^2,3 ^2,4 ^2,5 Ducati, J. R. (2002). »VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system«. CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.

[torres2006-4] 3,0 ^3,1 Torres, C. A. O.; Quast, G. R.; da Silva, L .; de la Reza, R.; Melo, C. H. F.; Sterzik, M. (2006). »Search for associations containing young stars (SACY)«. Astronomy and Astrophysics. 460 (3): 695–708. arXiv:astro-ph/0609258. Bibcode:2006A&A...460..695T. doi:10.1051/0004-6361:20065602. ISSN 0004-6361.

[valenti2005-5] 4,0 ^4,1 Valenti, Jeff A.; Fischer, Debra A. (2005). »Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs«. The Astrophysical Journal Supplement Series. 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi:10.1086/430500. ISSN 0067-0049.

[wilkinson2012-6] 5,0 ^5,1 Wilkinson, John (2012). »The Sun and Stars«. New Eyes on the Sun. Astronomers' Universe. str. 219–236. doi:10.1007/978-3-642-22839-1_10. ISBN 978-3-642-22838-4. ISSN 1614-659X.

[Wiegert-7] 6,0 ^6,1 P. A. Wiegert; M. J. Holman (1997). »The stability of planets in the Alpha Centauri system«. The Astronomical Journal. 113: 1445–1450. arXiv:astro-ph/9609106. Bibcode:1997AJ....113.1445W. doi:10.1086/118360.

[Thevenin02-8] 7,0 ^7,1 ^7,2 ^7,3 ^7,4 ^7,5 ^7,6 ^7,7 Thévenin, F.; Provost, J.; Morel, P.; Berthomieu, G.; Bouchy, F.; Carrier, F. (2002). »Asteroseismology and calibration of alpha Cen binary system«. Astronomy & Astrophysics. 392: L9. arXiv:astro-ph/0206283. Bibcode:2002A&A...392L...9T. doi:10.1051/0004-6361:20021074.

[kervella2017-9] 8,0 ^8,1 Kervella, P.; Bigot, L.; Gallenne, A.; Thévenin, F. (Januar 2017). »The radii and limb darkenings of α Centauri A and B. Interferometric measurements with VLTI/PIONIER«. Astronomy & Astrophysics. 597. A137. arXiv:1610.06185. Bibcode:2017A&A...597A.137K. doi:10.1051/0004-6361/201629505.

[aaa449-10] 9,0 ^9,1 Gilli G.; Israelian G.; Ecuvillon A.; Santos N. C.; Mayor M. (2006). »Abundances of Refractory Elements in the Atmospheres of Stars with Extrasolar Planets«. Astronomy and Astrophysics. 449 (2): 723–36. arXiv:astro-ph/0512219. Bibcode:2006A&A...449..723G. doi:10.1051/0004-6361:20053850. libcode 2005astro.ph.12219G.

[aaa470-11] 10,0 ^10,1 Bazot, M.; in sod. (2007). »Asteroseismology of α Centauri A. Evidence of rotational splitting«. Astronomy and Astrophysics. 470 (1): 295–302. arXiv:0706.1682. Bibcode:2007A&A...470..295B. doi:10.1051/0004-6361:20065694.

[dewarf2010-12] DeWarf, L.; Datin, K.; Guinan, E. (2010). »X-ray, FUV, and UV Observations of α Centauri B: Determination of Long-term Magnetic Activity Cycle and Rotation Period«. The Astrophysical Journal. 722 (1): 343–357. arXiv:1009.1652. Bibcode:2010ApJ...722..343D. doi:10.1088/0004-637X/722/1/343.

[raassen2003-13] Raassen, A. J. J; Ness, J.-U; Mewe, R; Van Der Meer, R. L. J; Burwitz, V; Kaastra, J. S (2003). »Chandra-LETGS X-ray observation of α Centauri: A nearby (G2V + K1V) binary system«. Astronomy & Astrophysics. 400 (2): 671–678. Bibcode:2003A&A...400..671R. doi:10.1051/0004-6361:20021899.

[joyce-14] Joyce, M.; Chaboyer, B. (2018). »Classically and Asteroseismically Constrained 1D Stellar Evolution Models of α Centauri a and B Using Empirical Mixing Length Calibrations«. The Astrophysical Journal. 864 (1): 99. arXiv:1806.07567. Bibcode:2018ApJ...864...99J. doi:10.3847/1538-4357/aad464.

[Pourbaix-15] Pourbaix, D.; in sod. (2002). »Constraining the difference in convective blueshift between the components of alpha Centauri with precise radial velocities«. Astronomy and Astrophysics. 386 (1): 280–85. arXiv:astro-ph/0202400. Bibcode:2002A&A...386..280P. doi:10.1051/0004-6361:20020287.

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Opazovalni podatki Epoha J2000.0 Enakonočje J2000.0
Lega Alfe Kentavra
Ozvezdje	Kentaver
Alpha Centauri A
Rektascenzija	14^h 39^m 36,49400^s^[1]
Deklinacija	–60° 50′ 02,3737″^[1]
Navidezni sij (V)	+0.01^[2]
Alpha Centauri B
Rektascenzija	14^h 39^m 35,06311^s^[1]
Deklinacija	–60° 50′ 15,0992″^[1]
Navidezni sij (V)	+1.33^[2]
Značilnosti
A
Spektralni razred	G2V^[3]
U−B Barvni indeks	+0,24^[2]
B−V Barvni indeks	+0,71^[2]
B
Spektralni razred	K1V^[3]
U−B Barvni indeks	+0,68^[2]
B−V Barvni indeks	+0,88^[2]
Astrometrija
A
Radialna hitrost (R_v)	2997786000000000000♠−214±076^[4] km/s
Lastno gibanje (μ)	RA: −3679,25^[1] mas/l Dec.: 473,67^[1] mas/l
Paralaksa (π)	754,81 ± 4,11^[1] mas
Oddaljenost	4,37^[5] sv. l.
Absolutni izsev (M_V)	4,38^[6]
B
Radialna hitrost (R_v)	2998814000000000000♠−18,6±1,64^[4] km/s
Lastno gibanje (μ)	RA: −3614,39^[1] mas/l Dec.: 802,98^[1] mas/l
Paralaksa (π)	754,81 ± 4,11^[1] mas
Oddaljenost	4,37^[5] sv. l.
Absolutni izsev (M_V)	5,71^[6]
Podrobnosti
Alpha Centauri A
Masa	1,100^[7] M_☉
Polmer	7000122340000000000♠1,2234±0,0053^[8] `R`_☉
Izsev	1,519^[7] L_☉
Površinska težnost (log g)	4,30^[9] cgs
Temperatura	5.790^[7] K
Kovinskost [Fe/H]	0,20^[7] dex
Vrtenje	7001220000000000000♠22±5,9 dni^[10]
Tirna hitrost(v sin i)	7000270000000000000♠2,7±0,7^[10] km/s
Alpha Centauri B
Masa	0,907^[7] M_☉
Polmer	6999863200000000000♠0,8632±0,0037^[8] `R`_☉
Izsev	0,5002^[7] L_☉
Površinska težnost (log g)	4,37^[9] cgs
Temperatura	5.260^[7] K
Kovinskost	0,23^[7]
Vrtenje	36^[11] days
Tirna hitrost(v sin i)	7000110000000000000♠1,1±0,8^[12] km/s
Starost	7000530000000000000♠5,3±0,3^[13] Ga
Orbita^[14]
Primarna	A
Spremljevalka	B
Perioda (P)	7001799100000000000♠79,91±0,011 l
Glavna polos (a)	7001175700000000000♠17,57±0,022″
Izsrednost tira (e)	6999517900000000000♠0,5179±0,00076
Naklon tira (i)	7001792050000000000♠79,205±0,041°
Dolžina vozla (Ω)	7002204850000000000♠204,85±0,084°
Epoha periastrona (T)	7003187566000000000♠1875,66±0,012
Argument periastrona (ω) (sekundarni)	7002231650000000000♠231,65±0,076°
Druge oznake
Gliese 559, FK5 538, CD−60°5483, CCDM J14396-6050, GC 19728
α Cen A: Rigil Kentaurus, Rigil Kent, α¹ Centauri, HR 5459, HD 128620, GCTP 3309.00, LHS 50, SAO 252838, HIP 71683
α Cen B: Toliman, α² Centauri, HR 5460, HD 128621, LHS 51, HIP 71681
Sklici na podatkovne baze
SIMBAD	AB
	[1]
	[2]
Exoplanet Archive	podatki
ARICNS	podatki
Extrasolar Planets Encyclopaedia	podatki

Normativna kontrola
Splošno	VIAF 1 WorldCat (via VIAF)
Narodne knjižnice	Nemčija Izrael
Drugo	Faceted Application of Subject Terminology