Alpha Corvi
Alpha Corvi (α Corvi, abbreviated Alpha Crv, α Crv), also named Alchiba /ˈælkɪbə/,[12] is an F-type main-sequence star and the fifth-brightest star in the constellation of Corvus. Based on parallax measurements made during the Hipparcos mission, it is approximately 49 light-years from the Sun.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corvus |
| Right ascension | 12h 08m 24.81652s[1] |
| Declination | −24° 43′ 43.9504″[1] |
| Apparent magnitude (V) | 4.03[2] |
| Characteristics | |
| Spectral type | F1 V[3] + M4 V[4] |
| U−B color index | +0.00[2] |
| B−V color index | +0.34[2] |
| Variable type | γ Dor?[5] |
| Astrometry | |
| Radial velocity (Rv) | +3.0[6] km/s |
| Proper motion (μ) | RA: 99.52[1] mas/yr Dec.: −39.19[1] mas/yr |
| Parallax (π) | 66.95 ± 0.15 mas[1] |
| Distance | 48.7 ± 0.1 ly (14.94 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.25[7] |
| Details | |
| Mass | 1.39[5] M☉ |
| Luminosity | 4.91[8] L☉ |
| Surface gravity (log g) | 4.13 ± 0.05[9] cgs |
| Temperature | 7,041 ± 53[9] K |
| Metallicity [Fe/H] | −0.19 ± 0.04[9] dex |
| Rotational velocity (v sin i) | 16.9 ± 1.5[10] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nomenclature
α Corvi (Latinised to Alpha Corvi) is the star's Bayer designation.
It bore the traditional names Al Chiba (Arabic ألخبا al-xibā "tent") and Al Minliar al Ghurab (Arabic منقار الغراب al-manxar al-ghurab)[13] or Minkar al Ghurab. The latter appeared in the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, which was translated into Latin as Rostrum Corvi (beak of the crow).[14] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[15] to catalogue and standardize proper names for stars. The WGSN approved the name Alchiba for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[12]
In Chinese astronomy, Alchiba is called 右轄, Pinyin: Yòuxiá, meaning Right Linchpin, because it stands alone in the Right Linchpin asterism, Chariot mansion (see: Chinese constellations),[16] 右轄 (Yòuxiá), westernized into Yew Hea by R.H. Allen.[13]
Namesake
USS Alchiba (AKA-6) is a former United States Navy ship.
Properties
Alchiba belongs to the spectral class F1V and has apparent magnitude +4.00. This star exhibits periodic changes in its spectrum over a three-day period, which suggests it is either a spectroscopic binary or (more likely) a pulsating Gamma Doradus-type variable.[5]
Alpha Corvi has a common proper motion companion, named Alpha Corvi B, located about 3.1 arcsec away. It is a red dwarf with a spectral type of M4V.[4]
See also
References
- ^ a b c d e f van Leeuwen, F. (November 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, S2CID 18759600
- ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ^ Gray, R. O.; et al. (July 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, S2CID 119476992.
- ^ a b Scholz, Ralf-Dieter (2021). "Gaia EDR3 Confirms a Red Dwarf Companion of the nearby F1 Star HD 105452 and Reveals a New Brown Dwarf Companion of the M4.5 Dwarf SCR J1214-2345". Research Notes of the AAS. 5 (3): 40. arXiv:2103.00144. Bibcode:2021RNAAS...5...40S. doi:10.3847/2515-5172/abea23. S2CID 232075955. 40.
- ^ a b c Fuhrmann, K.; Chini, R. (2012). "Multiplicity among F-type Stars". The Astrophysical Journal Supplement. 203 (2): 20. Bibcode:2012ApJS..203...30F. doi:10.1088/0067-0049/203/2/30. 30.
- ^ Nordström, B.; et al. (2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs", Publications of the Astronomical Society of Australia, 21 (2): 129–133, arXiv:0811.3982, Bibcode:2004PASA...21..129N, doi:10.1071/AS04013, S2CID 123457673.
- ^ Elgarøy, Øystein; Engvold, Oddbjørn; Lund, Niels (March 1999), "The Wilson-Bappu effect of the MgII K line - dependence on stellar temperature, activity and metallicity", Astronomy and Astrophysics, 343: 222–228, Bibcode:1999A&A...343..222E.
- ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
- ^ a b c Prugniel, P.; Vauglin, I.; Koleva, M. (2011). "The atmospheric parameters and spectral interpolator for the MILES stars". Astronomy & Astrophysics. 531: A165. arXiv:1104.4952. Bibcode:2011A&A...531A.165P. doi:10.1051/0004-6361/201116769. S2CID 54940439.
- ^ Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
- ^ "* alf Crv". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-05-20.
{{cite web}}: CS1 maint: postscript (link) - ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
- ^ a b Allen, Richard Hinckley, Star Names — Their Lore and Meaning: Corvus.
- ^ Knobel, E. B. (June 1895), "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket", Monthly Notices of the Royal Astronomical Society, 55: 429, Bibcode:1895MNRAS..55..429K, doi:10.1093/mnras/55.8.429.
- ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 22 日
External links
- Alpha Corvi by Professor Jim Kaler.