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)	−21.4±0.76 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)	−186±164 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	12234±00053 R☉
Izsev	1,519 L☉
Površinska težnost (log g)	4,30 cgs
Temperatura	5.790 K
Kovinskost [Fe/H]	0,20 dex
Vrtenje	22±59 dni
Tirna hitrost(v sin i)	27±07 km/s
Alpha Centauri B
Masa	0,907 M☉
Polmer	08632±00037 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)	11±08 km/s
Starost	53±03 Ga
Orbita
Primarna	A
Spremljevalka	B
Perioda (P)	7991±0011 l
Glavna polos (a)	1757±0022″
Izsrednost tira (e)	05179±000076
Naklon tira (i)	79205±0041°
Dolžina vozla (Ω)	20485±0084°
Epoha periastrona (T)	187566±0012
Argument periastrona (ω); (sekundarni)	23165±0076°
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
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

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

Sklici

1 2 3 4 5 6 7 8 9 10 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.
1 2 3 4 5 6 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.
1 2 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.
1 2 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.
1 2 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.
1 2 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.
1 2 3 4 5 6 7 8 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.
1 2 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.
1 2 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.
1 2 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 2 3 4 5 6 7 8 9 10 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] 1 2 3 4 5 6 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] 1 2 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] 1 2 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] 1 2 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] 1 2 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] 1 2 3 4 5 6 7 8 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] 1 2 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] 1 2 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] 1 2 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.

[op. 1]

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

[14]

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)	−21.4±0.76^[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)	−186±164^[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	12234±00053^[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	22±59 dni^[10]
Tirna hitrost(v sin i)	27±07^[10] km/s
Alpha Centauri B
Masa	0,907^[7] M_☉
Polmer	08632±00037^[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)	11±08^[12] km/s
Starost	53±03^[13] Ga
Orbita^[14]
Primarna	A
Spremljevalka	B
Perioda (P)	7991±0011 l
Glavna polos (a)	1757±0022″
Izsrednost tira (e)	05179±000076
Naklon tira (i)	79205±0041°
Dolžina vozla (Ω)	20485±0084°
Epoha periastrona (T)	187566±0012
Argument periastrona (ω) (sekundarni)	23165±0076°
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


Exoplanet Archive	podatki
ARICNS	podatki
Extrasolar Planets Encyclopaedia	podatki

Spletne zbirke normativne kontrole
Mednarodno	VIAF GND FAST
Nacionalno	Izrael
Drugo	Yale LUX