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Alfa Caeli
α Caeli
![]() Alpha Caeli terletak di bawah tengah. | Data pengamatan
Epoch J2000.0 (ICRS) Equinox J2000.0 | | Rasi bintang | Caelum | | Komponen | A | B | | Asensio rekta | 04j 40m | 04j 40m | | | 33.7125s | 34.0s | | Deklinasi | –41° 51′[1] | −41° 51′[2] | | | 49.509″ | 51″ | | Magnitudo semu (V) | 4.456 | 12.5[2] | | Karakteristik | | Klasifikasi bintang | F2V[3] | M0.5[2] | | U-B Indeks warna | +0.01[4] | | | B-V Indeks warna | +0.34[4] | | | Astrometri | | Kecepatan radial (Rv) | –0.6 ± 0.9[5] km/s | −0.6 ± 0.9[2] km/s | | Gerak diri: | | | RA (μα cos δ) | –141.18[1] m.b/thn | −147[2] m.b/thn | | Dec. (μδ) | –74.95[1] m.b/thn | −78[2] m.b/thn | | Paralaks (π) | 49.67 ± 0.53[1] m.b | | Jarak | 65,7 ± 0,7 tc
(20,1 ± 0,2 pc) | | Magnitudo mutlak (MV) | 3.39[6] | | | Details | | Massa | 1.48[7] M☉ | 0.3[8] M☉ | | Radius | 1.3[9] R☉ | | | Gravitasi permukaan (log g) | 4.01[3] | | | Temperatur | 6,991[3] K | 3800[8] K | | Metalisitas | ![{\displaystyle {\begin{smallmatrix}\left[{\frac {M}{H}}\right]\ =\ -0.10\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/16600af0892366aed7ed8ce42b4a6246cc211992) [3] | | | Kecepatan rotasi (v sin i) | 47.8 ± 2.4[10]km/dtk | | | Umur | 0.9 (0.7–1.3) × 109[7]thn | | | Referensi Database | | SIMBAD | data | data | | Nama lain | 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. [11]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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Alpha Caeli (α Cae, α Caeli) adalah sistem bintang ganda yang terletak di rasi bintang Caelum.
Alpha Caeli A diklasifikasikan sebagai F2V dengan magnitudo semu +4.44. Memiliki masa 1.48 kali masa matahari[7] dan 1.3 kali radius matahari.[9] Kecepatan putarnya diperkirakan 47.8 km/detik pada daerah ekuator.[10] Alfa Caeli sempat diduga sebagai bintang variabel Delta Scuti.[12]
Pasangannya merupakn bintang dengan klasifikasi M0.5V yang memiliki magnitudo mutlak 9.8.[13] Pasangannya ini merupaan bintang variabel UV Ceti yang secara berkala kecerahannya akan meningka.[14] Kedua bintang ini terpisah pada sudut 6.6 menit busur yang mengindikasikan sebuah orbit dengan sumbu semi-mayor yang diperkirakan 206 AU.[15]
Alpha Caeli berjarak sekitar 65.7 tahun cahaya dari bumi dan diperkirakan berusia 900 juta tahun, mengorbit galaksi bimasakti pada jarak 8,006 kpc dari inti galaksi dengan orbit berbentuk eksentris dengan eksentrisitas 0.07.[7]
Referensi
- ^ a b c d Perryman, M. A. C.; et al. (1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ a b c d e f g GJ 174.1 B -- Flare Star, database entry, SIMBAD. Accessed on line November 5, 2009.
- ^ a b c d Gray, R. O. (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.
- ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J.
- ^ Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: Academic Press. Bibcode:1967IAUS...30...57E.
- ^ Reiners, A. (2006). "Rotation- and temperature-dependence of stellar latitudinal differential rotation". Astronomy and Astrophysics. 446 (1): 267–277. arXiv:astro-ph/0509399 . Bibcode:2006A&A...446..267R. doi:10.1051/0004-6361:20053911.
- ^ a b c d Holmberg, J. (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.
- ^ a b Alpha Cae, Stars, Jim Kaler. Accessed on line November 5, 2009.
- ^ a b Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - 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.
- ^ a b Reiners, A.; Schmitt, J. H. M. M. (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, database entry, SIMBAD. Accessed on line November 4, 2009.
- ^ Petit, M. (1977). "Etoiles Proches Suspectees de Variabilite". Information Bulletin on Variable Stars. 1362: 1–3. Bibcode:1977IBVS.1362....1P.
- ^ Hawley, Suzanne L.; Gizis, John E.; Reid, Neill I. (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. (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. (1994). "Statistical studies of visual double and multiple stars. II. A catalogue of nearby wide binary and multiple systems". Revista Mexicana Astronomía y Astrofísica. 28 (1): 43–89. Bibcode:1994RMxAA..28...43P.
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