Alpha Caeli
Alpha Caeli (afgekort as α Cae) is 'n dubbelster in die sterrebeeld Graveerstif (Caelum). Die primêre ster, Alpha Caeli A, is ’n F-tipe hoofreeksster van spektraaltipe F2V en ’n skynbare magnitude van 4,44. Sy massa is 1,48 keer dié van die Son[4] en sy radius 1,3 keer die Son s'n.[6] Die geraamde rotasiespoed by die ster se ewenaar is 47,8 km/s.[7] Dit is vermoedelik ’n Delta Scuti-veranderlike.[9]
Alpha Caeli
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| Alpha Caeli se ligging (in die rooi sirkel). | ||||
| Sterrebeeld | Grafeerstif | |||
| Spektraaltipe | A: F2V[1] B: M0,5[2] | |||
| Soort | Dubbelster | |||
| Waarnemingsdata (Epog J2000) | ||||
| Regte klimming | A: 04h 40m 33.7125s B: 04h 40m 34.0s | |||
| Deklinasie | A: -41° 51′ 49.509″[3] B: -41° 51′ 51″[2] | |||
| Skynmagnitude (m) | A: 4,456 B: 12,5[2] | |||
| Besonderhede | ||||
| Massa (M☉) | A: 1,48[4] B: 0,3[5] | |||
| Radius (R☉) | A: 1,3[6] | |||
| Ouderdom (jaar) | A: 0.9 (0,7-1,3) miljard[4] | |||
| Temperatuur (K) | A: 6 991[1] B: 3 800[5] | |||
| Rotasiespoed (km/s) | A: 47,8±2,4[7] | |||
| Metaalinhoud [Fe/H] | A: -0,10[1] | |||
| Ander name | ||||
| A: CCDM J04406-4152A, CD−42°1587, CPD−42°513, FK5 1129, GC 5708, Gl 174.1 A, GJ 9164 A, HD 29875, HIP 21770, HR 1502, IDS 04373-4203 A, SAO 216926.[8] B: CCDM J04406-4152B, CD−42°1587B, CPD−42°513B, Gl 174.1 B, GJ 9164 B, IDS 04373-4203 B.[2] | ||||
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Die metgeselster, Alpha Caeli B, is ’n rooidwerg van spektraaltipe M0,5V en met ’n absolute magnitude van 9,8.[10] Dit is ’n UV Ceti-veranderlike wat lukrake toenames in sy ligsterkte ondervind.[11] Dié ster is tans met ’n hoek van 6,6 boogsekondes van A geskei, wat dui op ’n wentelbaan met ’n vermoedelike halwe lengteas van 206 AE.[12]
Alpha Caeli is sowat 65,7 ligjare van die Son af en is sowat 900 miljoen jaar oud. Sy wentelbaan om die Melkweg is sowat 26 ligjare van die kern af en het ’n eksentrisiteit van 0,07. Die wentelbaan lê na aan die galaktiese vlak.[4] Alpha Caeli is moontlik lid van die Ursa Major-groep sterre wat dieselfde kinetiese eienskappe het en moontlik uit dieselfde sterreswerm ontstaan het.[13]
Verwysings
wysig- ↑ 1,0 1,1 1,2 Gray, R. O.; et al. (Julie 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): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637.
- ↑ 2,0 2,1 2,2 2,3 GJ 174.1 B -- Flare Star, databasis, SIMBAD. Besoek op 5 November 2009.
- ↑ Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". [Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ↑ 4,0 4,1 4,2 4,3 Holmberg, J.; et al. (November 2007). "The Geneva-Copenhagen survey of the Solar neighbourhood II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk". Astronomy and Astrophysics. 475 (2): 519–537. arXiv:0707.1891. Bibcode:2007A&A...475..519H. doi:10.1051/0004-6361:20077221. Sien die vir HIP 21770 in die VizieR-tabel met die CDS-ID V/117A.
- ↑ 5,0 5,1 Alpha Cae, Stars, Jim Kaler. Besoek op 5 November 2009.
- ↑ 6,0 6,1 Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (Februarie 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – 3de uitg. - Comments and statistics". Astronomy and Astrophysics. 367 (2): 521–524. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
- ↑ 7,0 7,1 Reiners, A.; Schmitt, J. H. M. M. (Desember 2003). "Differential rotation in rapidly rotating F-stars". Astronomy and Astrophysics. 412 (3): 813–819. arXiv:astro-ph/0309616. Bibcode:2003A&A...412..813R. doi:10.1051/0004-6361:20034255.
- ↑ * alf Cae -- Star in double system, databasis, SIMBAD. Besoek op 4 November 2009.
- ↑ Petit, M. (November 1977). "Etoiles Proches Suspectees de Variabilite". Information Bulletin on Variable Stars. 1362: 1–3. Bibcode:1977IBVS.1362....1P. Besoek op 24 September 2009.
- ↑ Hawley, Suzanne L.; Gizis, John E.; Reid, Neill I. (April 1997). "Erratum: The Palomar/MSU Nearby Star Spectroscopic Survey.II.The Southern M Dwarfs and Investigation of Magnetic Activity". Astronomical Journal. 113: 1458. Bibcode:1997AJ....113.1458H. doi:10.1086/118363.
- ↑ Gershberg, R. E.; et al. (November 1999). "Catalogue and bibliography of the UV Cet-type flare stars and related objects in the solar vicinity". Astronomy and Astrophysics Supplement. 139 (3): 555–558. Bibcode:1999A&AS..139..555G. doi:10.1051/aas:1999407.
- ↑ Poveda, A.; et al. (April 1994). "Statistical studies of visual double and multiple stars. II. A catalogue of nearby wide binary and multiple systems". Revista Mexicana de Astronomía y Astrofísica. 28 (1): 43–89. Bibcode:1994RMxAA..28...43P. Besoek op 24 September 2009.
- ↑ King, Jeremy R.; et al. (April 2003). "Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group". The Astronomical Journal. 125 (4): 1980–2017. Bibcode:2003AJ....125.1980K. doi:10.1086/368241.
Eksterne skakels
wysig
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