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Gamma1 Fornacis

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Star in the constellation Fornax For other stars with this Bayer designation, see γ Fornacis.
γ Fornacis
Location of γ Fornacis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Fornax
Right ascension 02 49 50.96219
Declination −24° 33′ 37.1290″
Apparent magnitude (V) 6.154
Characteristics
Spectral type G9 III
B−V color index 1.081
Astrometry
Radial velocity (Rv)−6.58±0.64 km/s
Proper motion (μ) RA: −51.603 mas/yr
Dec.: −127.797 mas/yr
Parallax (π)8.8835 ± 0.0576 mas
Distance367 ± 2 ly
(112.6 ± 0.7 pc)
Absolute magnitude (MV)+0.52±0.21
Details
Mass1.65 M☉
Radius10.44+0.73
−0.49 R☉
Luminosity50.814±0.439 L☉
Surface gravity (log g)2.60 cgs
Temperature4,657±56 K
Metallicity −0.02 dex
Age3.36 Gyr
Other designations
γ For, CD−25°1120, GC 3404, HD 17713, HIP 13197, HR 844, SAO 168081, WDS J02498-2434A
Database references
SIMBADdata

Gamma Fornacis, which is Latinized from γ Fornacis, is a star in the constellation Fornax, positioned less than a degree south of the border with Eridanus. The star has a golden hue and can be a challenge to view with the naked eye even in good seeing conditions, having an apparent visual magnitude of 6.15. It is located at a distance of approximately 367 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −7 km/s. The star has an absolute magnitude of +0.5.

The stellar classification of γ Fornacis is G9 III, which indicates this is an aging giant star that has exhausted the supply of hydrogen at its core, then cooled and expanded away from the main sequence. It is an estimated 3.4 billion years old with a metallicity that is close to solar, indicating the abundances of heavy elements are similar to those in the Sun. It has 1.65 times the mass of the Sun and has expanded to ten times the Sun's radius. The star is radiating 51 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,657 K.

γ Fornacis has three visual companions listed in the Washington Double Star Catalog. These are faint 11th - 13th magnitude stars at 11' - 56' distance from γ. Gamma Fornacis is a 5th magnitude star located four degrees to the south.

References

  1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal. 150 (3). 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
  3. ^ Abt, Helmut A. (2008). "Visual Multiples. IX. MK Spectral Types". The Astrophysical Journal Supplement Series. 176 (1): 216–217. Bibcode:2008ApJS..176..216A. doi:10.1086/525529.
  4. ^ Luck, R. Earle; Heiter, Ulrike (2007). "Giants in the Local Region". The Astronomical Journal. 133 (6): 2464. Bibcode:2007AJ....133.2464L. doi:10.1086/513194.
  5. "gam01 For". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-16.
  6. ^ Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 1. Sky Publishing Corporation and the European Space Agency. pp. 358, 381. ISBN 0-933346-84-0.
  7. Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
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