Astronomy:Gamma2 Fornacis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 49m 54.1822s[1] |
| Declination | −27° 56′ 31.123″[1] |
| Apparent magnitude (V) | 5.389[2] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | A1 V[4] |
| B−V color index | 0.013±0.004[5] |
| Astrometry | |
| Radial velocity (Rv) | 24.0±4.2[6] km/s |
| Proper motion (μ) | RA: −47.053[1] mas/yr Dec.: 20.932[1] mas/yr |
| Parallax (π) | 6.3134 ± 0.1330[1] mas |
| Distance | 520 ± 10 ly (158 ± 3 pc) |
| Absolute magnitude (MV) | −0.35[5] |
| Details | |
| Mass | 2.40+0.44 −0.38[2] M☉ |
| Radius | 4.488[7] R☉ |
| Luminosity | 117.073±0.111[7] L☉ |
| Surface gravity (log g) | 3.50±0.25[2] cgs |
| Temperature | 9,000±500[2] K |
| Metallicity [Fe/H] | −0.02[8] dex |
| Rotational velocity (v sin i) | 149[3] km/s |
| Age | 401+138 −170[2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma2 Fornacis, a name Latinized from γ2 Fornacis, is a single[10] star in the southern constellation Fornax. It has a white hue and is faintly visible to the naked eye at night with an apparent visual magnitude of 5.4.[2] The distance to Gamma2 Fornacis is approximately 520 light years based on parallax.[1] It is drifting further away with a radial velocity of 24 km/s.[6] Gamma1 Fornacis is a 6th magnitude star about four degrees to the north.[11]
The stellar classification of Gamma2 Fornacis is A1 V,[4] which is notation for an A-type main-sequence star that, like the Sun, is generating energy through core hydrogen fusion. Comparison of its properties to theoretical models suggest an age of about 400[2] million years old. It has a high rate of spin, showing a projected rotational velocity of 149 km/s.[3] The star has 2.4[2] times the mass of the Sun and 4.5[7] times the Sun's radius. It is radiating 117[7] times the luminosity of the Sun from its photosphere at an effective temperature of roughly 9,000 K.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Gullikson, Kevin et al. (2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal 152 (2): 40. doi:10.3847/0004-6256/152/2/40. Bibcode: 2016AJ....152...40G.
- ↑ 3.0 3.1 3.2 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z.
- ↑ 4.0 4.1 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations -40_ƒ0 to -26_ƒ0. 3. Bibcode: 1982mcts.book.....H.
- ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 7.2 7.3 McDonald, I. et al. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770. doi:10.1093/mnras/stx1433. Bibcode: 2017MNRAS.471..770M.
- ↑ Anders, F. et al. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. Bibcode: 2019A&A...628A..94A.
- ↑ "gam02 For". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=gam02+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.
- ↑ Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. 1. Sky Publishing Corporation and the European Space Agency. p. 381. ISBN 0-933346-84-0.
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