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Alfa Kentavra
 Lega Alfe Kentavra | |
| Opazovalni podatki Epoha J2000.0 Enakonočje J2000.0 | |
|---|---|
| Ozvezdje | Kentaver |
| Alpha Centauri A | |
| Rektascenzija | 14h 39m 36,49400s[1] |
| Deklinacija | –60° 50′ 02,3737″[1] |
| Navidezni sij (V) | +0.01[2] |
| Alpha Centauri B | |
| Rektascenzija | 14h 39m 35,06311s[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 (Rv) | −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 (MV) | 4,38[6] |
| B | |
| Radialna hitrost (Rv) | −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 (MV) | 5,71[6] |
| Podrobnosti | |
| Alpha Centauri A | |
| Masa | 1,100[7] M☉ |
| Polmer | 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 | 22±5,9 dni[10] |
| Tirna hitrost(v sin i) | 2,7±0,7[10] km/s |
| Alpha Centauri B | |
| Masa | 0,907[7] M☉ |
| Polmer | 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) | 1,1±0,8[12] km/s |
| Starost | 5,3±0,3[13] Ga |
| Orbita[14] | |
| 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 | |
| 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.
Napaka pri navajanju: Obstajajo <ref group=op.> oznake na tej strani, toda sklici se ne bodo izpisali brez predloge {{sklici|group=op.}} (glej stran pomoči).
- ↑ 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.
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