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Chi2 Fornacis

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Star in the constellation Fornax For other stars with a similar Bayer designation, see χ Fornacis.
χ Fornacis
Location of χ Fornacis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Fornax
Right ascension 03 27 33.42119
Declination −35° 40′ 52.7728″
Apparent magnitude (V) 5.70±0.01
Characteristics
Spectral type K2 III
B−V color index +1.29
Variable type suspected
Astrometry
Radial velocity (Rv)30.0±4.3 km/s
Proper motion (μ) RA: +77.064 mas/yr
Dec.: +5.989 mas/yr
Parallax (π)6.8558 ± 0.0446 mas
Distance476 ± 3 ly
(145.9 ± 0.9 pc)
Absolute magnitude (MV)0.00
Details
Mass1.18 M☉
Radius23.58±1.19 R☉
Luminosity194
−3 L☉
Surface gravity (log g)1.83 cgs
Temperature4,477±122 K
Metallicity +0.02 dex
Rotational velocity (v sin i)<1.0 km/s
Other designations
χ For, 91 G. Fornacis[13], NSV 15697, CD−36°1306, CPD−36°355, FK5 2244, GC 4129, HD 21574, HIP 16112, HR 1054, SAO 194312, TIC 142889216
Database references
SIMBADdata

Chi Fornacis, Latinized from χ Fornacis, is a solitary star located in the southern constellation Fornax, the furnace. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.70. Gaia DR3 parallax measurements imply a distance of 476 light-years and it is currently receding with a heliocentric radial velocity of approximately 30 km/s. At its current distance, Chi Fornacis' brightness is diminished by an interstellar extinction of 0.11 magnitudes and it has an absolute magnitude of 0.00.

Chi Fornacis is an old-disk star and it has a stellar classification of K2 III. The class indicates that it is an evolved K-type giant that has ceased hydrogen fusion at its core and left the main sequence. It has 118% the mass of the Sun but it has expanded to 23.58 times the radius of the Sun. It radiates 194 times the luminosity of the Sun from its photosphere at an effective temperature of 4,477 K. Chi Fornacis is slightly metal enriched with a near-solar iron abundance of = +0.02. It spins too slowly for its projected rotational velocity to be measured accurately, having a projected rotational velocity lower than 1.0 km/s.

The star was observed to be variable in infrared light during a 1991 IRAS survey for galaxy clusters. However, its variability in optical light is unknown. In addition, subsequent observations have not confirmed the variability in infrared and optical light. The lenticular galaxy NGC 1380 lies 2 degrees north-northeast of Chi Fornacis.

References

  1. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
  3. ^ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. Vol. 3. Bibcode:1982mcts.book.....H.
  4. Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. eISSN 1562-6881. ISSN 1063-7729. S2CID 125853869.
  6. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  7. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  8. ^ Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
  9. ^ Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
  10. ^ Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
  11. ^ Eggen, O. J. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal. 106: 80. Bibcode:1993AJ....106...80E. doi:10.1086/116622.
  12. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361. S2CID 54046583.
  13. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  14. "Chi02 For". simbad.cds.unistra.fr. Retrieved 2024-01-18.
  15. Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
  16. Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
  17. Wang, G.; Clowes, R. G.; Leggett, S. K.; MacGillivray, H. T.; Savage, A. (1991). "Optical identifications of IRAS point sources: the Fornax, Hydra I and Coma clusters". Monthly Notices of the Royal Astronomical Society. 248 (1): 112–127. Bibcode:1991MNRAS.248..112W. doi:10.1093/mnras/248.1.112. ISSN 0035-8711. S2CID 120387905.
  18. Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog: II/250. Bibcode:2004yCat.2250....0S.
  19. O'Meara, Stephen James (2013). Deep-Sky Companions: Southern Gems. Cambridge University Press. pp. 78–80. Bibcode:2013dcsg.book.....O. ISBN 9781107015012.
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