Astronomy:Beta Fornacis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 49m 05.41885s[1] |
| Declination | −32° 24′ 21.2319″[1] |
| Apparent magnitude (V) | 4.46[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| U−B color index | +0.69[2] |
| B−V color index | +0.99[2] |
| R−I color index | +0.54 |
| Astrometry | |
| Radial velocity (Rv) | +16.8[4] km/s |
| Proper motion (μ) | RA: 85.741 ± 0.240[5] mas/yr Dec.: 158.972 ± 0.289[5] mas/yr |
| Parallax (π) | 18.3244 ± 0.1913[5] mas |
| Distance | 178 ± 2 ly (54.6 ± 0.6 pc) |
| Absolute magnitude (MV) | 0.894[6] |
| Details[7] | |
| Mass | 1.53 M☉ |
| Radius | 11.02 R☉ |
| Luminosity | 55.8 L☉ |
| Surface gravity (log g) | 2.45 cgs |
| Temperature | 4,820 K |
| Metallicity [Fe/H] | −0.37±0.08 dex |
| Rotational velocity (v sin i) | 2.19 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Beta Fornacis (Beta For, β Fornacis, β For) is the Bayer designation for a solitary[9] star in the southern constellation of Fornax. It is visible to the naked eye with an apparent visual magnitude of 4.46.[2] Based upon an annual parallax shift of 18.89 mas,[1] it is located around 173 light years away from the Sun. At that distance, the visual magnitude is reduced by an interstellar extinction factor of 0.1.[7]
This is an evolved, G-type giant star with a stellar classification of G8 III.[3] It is a red clump giant, which means it has undergone helium flash and is currently generating energy through the fusion of helium at its core.[10][6] The star has an estimated 1.53 times the mass of the Sun and has expanded to 11 times the Sun's radius. It is radiating over 55 times the solar luminosity from its outer atmosphere at an effective temperature of 4,820 K.[7]
Beta Fornacis has a visual companion, CCDM J02491-3224B, which has an apparent visual magnitude of approximately 14.0. As of 1928, it lay at an angular separation of 4.80 arc seconds along a position angle of 67°.[11] Located around three degrees to the southwest is the globular cluster NGC 1049.[12]
References
- ↑ 1.0 1.1 1.2 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1999), "UBVRIJKL photometry of the bright stars", Commission Lunar and Planetary Laboratory 4: 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ↑ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Washington: Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W.
- ↑ 5.0 5.1 5.2 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 6.0 6.1 Liu, Y. J. et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society 382 (2): 553–66, doi:10.1111/j.1365-2966.2007.11852.x, Bibcode: 2007MNRAS.382..553L.
- ↑ 7.0 7.1 7.2 Jones, M. I. et al. (2011), "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets", Astronomy & Astrophysics 536: A71, doi:10.1051/0004-6361/201117887, Bibcode: 2011A&A...536A..71J.
- ↑ "* bet For". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+bet+For.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Kubiak, M.; McWilliam, A.; Udalski, A.; Gorski, K. (June 2002), "Metal Abundance of Red Clump Stars in Baade's Window", Acta Astronomica 52: 159–175, Bibcode: 2002AcA....52..159K.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
- ↑ Plotner, Tammy (2007), The Night Sky Companion: A Yearly Guide to Sky-Watching 2008-2009, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 617, ISBN 978-0387716091, https://books.google.com/books?id=f42fFDCTF0MC&pg=PA617.
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