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Chi2 Fornacis

From Wikipedia, the free encyclopedia
Star in the constellation Fornax
For other stars with a similarBayer designation, seeχ Fornacis.
χ2 Fornacis
Location of χ2 Fornacis (circled)
Observation data
EpochJ2000.0      EquinoxJ2000.0 (ICRS)
ConstellationFornax
Right ascension03h 27m 33.42119s[1]
Declination−35° 40′ 52.7728″[1]
Apparent magnitude (V)5.70±0.01[2]
Characteristics
Spectral typeK2 III[3]
B−Vcolor index+1.29[4]
Variable typesuspected[5]
Astrometry
Radial velocity (Rv)30.0±4.3[6] km/s
Proper motion (μ)RA: +77.064mas/yr[1]
Dec.: +5.989mas/yr[1]
Parallax (π)6.8558±0.0446 mas[1]
Distance476 ± 3 ly
(145.9 ± 0.9 pc)
Absolute magnitude (MV)0.00[7]
Details
Mass1.18[8] M☉
Radius23.58±1.19[9] R☉
Luminosity194+4
−3[1] L☉
Surface gravity (log g)1.83[8] cgs
Temperature4,477±122[10] K
Metallicity [Fe/H]+0.02[11] dex
Rotational velocity (v sin i)<1.0[12] km/s
Other designations
χ2 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[14]
Database references
SIMBADdata

Chi2 Fornacis,Latinized from χ2 Fornacis, is a solitarystar[15] located in the southernconstellationFornax, the furnace. It is faintly visible to thenaked eye as an orange-hued point of light with anapparent magnitude of 5.70.Gaia DR3parallax measurements imply a distance of 476light-years and it is currently receding with a heliocentricradial velocity of approximately30 km/s.[6] At its current distance, Chi2 Fornacis' brightness is diminished by aninterstellar extinction of 0.11magnitudes[16] and it has anabsolute magnitude of 0.00.[7]

Chi2 Fornacis is anold-disk star[11] and it has astellar classification of K2 III.[3] The class indicates that it is anevolvedK-type giant that has ceasedhydrogen fusion at itscore and left themain sequence. It has 118% themass of the Sun[8] but it has expanded to 23.58 times theradius of the Sun.[9] It radiates 194 times theluminosity of the Sun[1] from itsphotosphere at aneffective temperature of4,477 K.[10] Chi2 Fornacis is slightly metal enriched with a near-solariron abundance of [Fe/H] = +0.02.[11] It spins too slowly for itsprojected rotational velocity to be measured accurately, having aprojected rotational velocity lower than1.0 km/s.[12]

The star was observed to bevariable ininfrared light during a 1991IRAS survey forgalaxy clusters.[17] However, its variability in optical light is unknown. In addition, subsequent observations have not confirmed the variability in infrared and optical light.[18] The lenticular galaxyNGC 1380 lies 2 degrees north-northeast of Chi2 Fornacis.[19]

References

[edit]
  1. ^abcdefVallenari, 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 atVizieR.
  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. ^abHouk, 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. ^abGontcharov, 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. ^abAnderson, 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. ^abcAnders, F.; et al. (August 2019)."Photo-astrometric distances, extinctions, and astrophysical parameters forGaia DR2 stars brighter thanG = 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. ^abKervella, 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. ^abStassun, Keivan G.; et al. (9 September 2019)."The RevisedTESS 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. ^abcEggen, 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. ^abDe 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. Retrieved2024-01-18.
  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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