Beta Corvi
 Location of β Corvi (circled) |
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
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|---|---|
| Constellation | Corvus |
| Right ascension | 12h 34m 23.23484s[1] |
| Declination | −23° 23′ 48.3374″[1] |
| Apparent magnitude (V) | 2.647[2] |
| Characteristics | |
| Spectral type | G5 II[3] |
| U−B color index | +0.586[2] |
| B−V color index | +0.898[2] |
| R−I color index | +0.44[4] |
| Astrometry | |
| Radial velocity (Rv) | −7.6[5] km/s |
| Proper motion (μ) | RA: +1.11[1] mas/yr Dec.: −56.56[1] mas/yr |
| Parallax (π) | 22.39 ± 0.18[1] mas |
| Distance | 146 ± 1 ly (44.7 ± 0.4 pc) |
| Absolute magnitude (MV) | –0.61[6] |
| Details | |
| Mass | 3.7 ± 0.1[3] M☉ |
| Radius | 16[7] R☉ |
| Surface gravity (log g) | 2.52 ± 0.03[3] |
| Luminosity | 160[8] L☉ |
| Temperature | 5,100 ± 80[3] K |
| Metallicity [Fe/H] | –0.01[6] dex |
| Rotational velocity (v sin i) | 8[9] km/s |
| Age | 2.06 × 108[3] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
Beta Corvi (Beta Crv, β Corvi, β Crv) is the second brightest star in the southern constellation of Corvus. It has the traditional name Kraz. The origin and meaning of this name remains uncertain.[8][11]
In Chinese, 軫宿 (Zhěn Sù), meaning Chariot (asterism), refers to an asterism consisting of β Corvi, γ Corvi, ε Corvi and δ Corvi.[12] Consequently, β Corvi itself is known as 軫宿四 (Zhěn Sù sì, English: the Fourth Star of Chariot.).[13]
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[edit] Structure
Beta Corvi has about 3.7 times the Sun's mass and is roughly 206 million years in age,[3] which is old enough for a star of this mass to consume the hydrogen at its core and evolve away from the main sequence. The stellar classification is G5 II,[3] with the luminosity class of 'II' indicating this is a bright giant. The effective temperature of the star's outer envelope is about 5,100 K,[3] which produces a yellow hue common to G-type stars.[14]
The measured angular diameter of this star is 3.30 ± 0.17 mas.[7] At an estimated distance of 146 light-years (45 parsecs),[1] this yields a physical size of about 16 times the radius of the Sun.[15][8] Because of the star's mass and radius, it is emitting about 160 times the luminosity of the Sun.[8] The abundance of elements other than hydrogen or helium, what astronomers term metallicity, is similar to the proportions in the Sun.[6]
This is a variable star that ranges in apparent visual magnitude from a low of 2.66 to a high of 2.60.[16]
[edit] See also
[edit] 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. Bibcode 2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ a b c Gutierrez-Moreno, Adelina et al. (1966). A System of photometric standards. 1. Publicaciones Universidad de Chile, Department de Astronomy. pp. 1–17. Bibcode 1966PDAUC...1....1G.
- ^ a b c d e f g h Lyubimkov, Leonid S. et al. (February 2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society 402 (2): 1369–1379. Bibcode 2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x.
- ^ a b HR 4786, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 9, 2008.
- ^ Evans, D. S. (June 20–24, 1966). Batten, Alan Henry; Heard, John Frederick. eds. The Revision of the General Catalogue of Radial Velocities. University of Toronto: International Astronomical Union. Bibcode 1967IAUS...30...57E.
- ^ a b c Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan 60 (4): 781–802, Bibcode 2008PASJ...60..781T
- ^ a b Richichi; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431: 773–777, Bibcode 2005A&A...431..773R, doi:10.1051/0004-6361:20042039
- ^ a b c d Kaler, James B., "KRAZ (Beta Corvi)", Stars (University of Illinois), http://stars.astro.illinois.edu/sow/kraz.html, retrieved 2012-12-28
- ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago 239 (1). Bibcode 1970CoAsi.239....1B.
- ^ SV* ZI 946 -- Variable Star, database entry, SIMBAD. Accessed on line September 9, 2008.
- ^ Falkner, David E. (2011), The Mythology of the Night Sky: An Amateur Astronomer's Guide to the Ancient Greek and Roman Legends, Patrick Moore's Practical Astronomy, Springer, p. 81, ISBN 1461401364, http://books.google.com/books?id=tyj8UUE968wC&pg=PA81
- ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ^ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16
- ^ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3 ed.), Birkhäuser, ISBN 3540296921, http://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R*) is given by:
- ^ Kukarkin, B. V. et al. (1981), Nachrichtenblatt der Vereinigung der Sternfreunde e.V. (Catalogue of suspected variable stars), Moscow: Academy of Sciences USSR Shternberg, Bibcode 1981NVS...C......0K
[edit] External links
- Jim Kaler. "Kraz". Stars. http://www.astro.uiuc.edu/~kaler/sow/kraz.html.
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