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Beta Cephei
Beta Cephei
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| Beta Cephei se ligging (in die rooi sirkel). | ||||
| Sterrebeeld | Kefeus | |||
| Spektraaltipe | B2 IIIev[1] | |||
| Soort | Veelvoudig Veranderlik | |||
| Waarnemingsdata (Epog J2000) | ||||
| Regte klimming | 21h 28m 39.5971s[1] | |||
| Deklinasie | +70° 33′ 38.578″[1] | |||
| Skynmagnitude (m) | 3,1438[2] | |||
| Absolute magnitude (M) | –3,468[2] | |||
| B-V-kleurindeks | -0,22[3] | |||
| U-B-kleurindeks | -0,95[3] | |||
| Besonderhede | ||||
| Massa (M☉) | 12 | |||
| Radius (R☉) | 9 | |||
| Ligsterkte (L☉) | 36 900 | |||
| Temperatuur (K) | 26 700 | |||
| Eienskappe | ||||
| Veranderlikheid | Beta Cephei-veranderlike | |||
| Ander name | ||||
| Alfirk, 8 Cep, AAVSO 2127+70, AG+70° 738, BD+69 1173, CCDM J21287+7034A, FK5 809, GSC 04465-02643, HD 205021, HIP 106032, HR 8238, SAO 10057, WDS J21287+7034 Aa, Ab.[1] | ||||
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Beta Cephei (afgekort as β Cep), met die tradisionele naam Alfirk, is ’n ster van die 3de magnitude in die sterrebeeld Kefeus (Cepheus). Dit is die prototipe van die Beta Cephei-veranderlikes.
- ↑ 1,0 1,1 1,2 1,3 "V* bet Cep -- Variable Star of beta Cep type", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=bet+cep&submit=SIMBAD+search, besoek op 2010-12-26
- ↑ 2,0 2,1 van Leeuwen, F. (November 2007), "Hipparcos, the New Reduction", Astronomy and Astrophysics (Centre de Données astronomiques de Strasbourg) 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V, http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%20106032, besoek op 2010-12-26
- ↑ 3,0 3,1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (ongepubliseer)". Catalogue of Eggen's UBV data. SIMBAD. Bibcode:1986EgUBV........0M.
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