Astronomy:Rho Fornacis

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Short description: Star in the constellation Fornax
ρ Fornacis
Location of ρ Fornacis (bottom star inside circle)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Fornax
Right ascension  03h 47m 56.04033s[1]
Declination −30° 10′ 4.3781″[1]
Apparent magnitude (V) +5.452[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type G6III[4]
U−B color index +0.66[5]
B−V color index +0.98[5]
Astrometry
Radial velocity (Rv)51.03±0.12[1] km/s
Proper motion (μ) RA: +25.932[1] mas/yr
Dec.: −231.4[1] mas/yr
Parallax (π)11.5326 ± 0.0512[1] mas
Distance283 ± 1 ly
(86.7 ± 0.4 pc)
Details
Mass1.16±0.10 – 1.24±0.11[6] M☉
Radius10.192±0.201[7] R☉
Luminosity50.28±1.10[7] L☉
Surface gravity (log g)2.43±0.06[7] cgs
Temperature4,815±52[7] K
Metallicity [Fe/H]−0.34±0.02[7] dex
Age3.9±1.0 – 4.67±1.03[6] Gyr
Other designations
ρ For, CD−30°1497, FK5 2272, HD 23940, HIP 17738, HR 1184, SAO 194535[8]
Database references
SIMBADdata

Rho Fornacis (ρ For)[8] is a star of apparent magnitude +5.45[2] in the constellation of Fornax, the furnace. Its distance from Earth, according to stellar parallax measurements taken by the Gaia spacecraft, is 283 light-years.[1]

Rho Fornacis is a yellow-orange giant of spectral type G6III with an effective temperature of 4,815±4,815 K - similar, though somewhat hotter, than β Fornacis and π Fornacis, stars also in Fornax. The radius of Rho Fornacis is over 10 larger than the solar radius but its mass is only a few percent greater than that of the Sun. Its age is estimated at between three and five billion years.

Rho Fornacis is a thick disk star, unlike most stars in our environment. Arcturus (α Boötis) and ε Fornacis, the latter in this same constellation, are examples of thick disk stars. The eccentricity of its orbit around the Galactic Center (e = 0.56) is considerably greater than that of the Sun (e = 0.16), star of the thin disk.[9] Consequently, it shows a low metallicity—relative abundance of elements heavier than helium—, less than half that of the solar ([Fe/H] = -0.34).[10] Elements such as aluminum, calcium and sodium are equally deficient. As in other similar stars, the oxygen/iron ratio is higher than in the Sun ([O/H] = 0.33).[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Paunzen, E. (2015-08-01). "A new catalogue of Strömgren-Crawford uvbyβ photometry". Astronomy and Astrophysics 580: A23. doi:10.1051/0004-6361/201526413. ISSN 0004-6361. Bibcode: 2015A&A...580A..23P.  Rho Fornacis' database entry at VizieR.
  3. ↑ Setiawan, J.; Pasquini, L.; Da Silva, L.; Hatzes, A. P.; von Der Lühe, O.; Girardi, L.; De Medeiros, J. R.; Guenther, E. (2004). "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch". Astronomy and Astrophysics 421: 241. doi:10.1051/0004-6361:20041042-1. Bibcode: 2004A&A...421..241S. 
  4. ↑ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode: 1982mcts.book.....H. 
  5. ↑ 5.0 5.1 Paczynski, B.; Udalski, A.; Szymanski, M.; Kubiak, M.; Pietrzynski, G.; Soszynski, I.; Wozniak, P.; Zebrun, K. (1999). "The Optical Gravitational Lensing Experiment. UBVI Photometry of Stars in Baade's Window". Acta Astronomica 49: 319. Bibcode: 1999AcA....49..319P. 
  6. ↑ 6.0 6.1 Gallenne, A.; Pietrzyński, G.; Graczyk, D.; Nardetto, N.; Mérand, A.; Kervella, P.; Gieren, W.; Villanova, S. et al. (2018-08-01). "Fundamental properties of red-clump stars from long-baseline H-band interferometry" (in en). Astronomy & Astrophysics 616: A68. doi:10.1051/0004-6361/201833341. ISSN 0004-6361. Bibcode: 2018A&A...616A..68G. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C. et al. (2024-02-01). "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version". Astronomy and Astrophysics 682: A145. doi:10.1051/0004-6361/202347136. ISSN 0004-6361. Bibcode: 2024A&A...682A.145S.  Rho Fornacis' database entry at VizieR.
  8. ↑ 8.0 8.1 =submit+id rho For -- Variable Star (SIMBAD)
  9. ↑ Rho Fornacis (Ashland Astronomy Studio)
  10. ↑ Da Silva, L.; Girardi, L.; Pasquini, L.; Setiawan, J.; von Der Lühe, O.; De Medeiros, J. R.; Hatzes, A.; Döllinger, M. P. et al. (2006). "Basic physical parameters of a selected sample of evolved stars". Astronomy and Astrophysics 458 (2): 609. doi:10.1051/0004-6361:20065105. Bibcode: 2006A&A...458..609D. 
  11. ↑ Alves-Brito, A.; Meléndez, J.; Asplund, M.; Ramírez, I.; Yong, D. (2010). "Chemical similarities between Galactic bulge and local thick disk red giants: O, Na, Mg, al, Si, Ca, and Ti". Astronomy and Astrophysics 513: A35. doi:10.1051/0004-6361/200913444. Bibcode: 2010A&A...513A..35A. 



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