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χ Fornacis

Location of χ Fornacis (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Fornax
Right ascension	03 25 55.84196
Declination	−35° 55′ 15.1876″
Apparent magnitude (V)	6.39±0.01
Characteristics
Evolutionary stage	main sequence star
Spectral type	A1 IV
B−V color index	+0.08
Astrometry
Radial velocity (Rv)	19.0±0.5 km/s
Proper motion (μ)	RA: +36.770 mas/yr Dec.: −4.641 mas/yr
Parallax (π)	9.6154 ± 0.0266 mas
Distance	339.2 ± 0.9 ly (104.0 ± 0.3 pc)
Absolute magnitude (MV)	+1.42
Details
Mass	2.05±0.08 M☉
Radius	2.20±0.11 R☉
Luminosity	31.24 −3.09 L☉
Surface gravity (log g)	4.08±0.07 cgs
Temperature	8,770 −120 K
Metallicity	0.00 −0.04 dex
Rotational velocity (v sin i)	136 km/s
Age	5.5±0.5 Myr
Other designations
χ For, 89 G. Fornacis[13], NSV 1162, CD−36°1290, CPD−36°350, GC 4097, HD 21573, HIP 15987, HR 1042, SAO 194289
Database references
SIMBAD	For data

Chi Fornacis, Latinised from χ Fornacis is a solitary white-hued star located in the southern constellation Fornax. It is barely visible to the naked eye with an apparent magnitude of 6.39, which is near the limit for naked eye visibility. Gaia DR3 parallax measurements imply a distance of 339 light-years and it is currently drifitng away with a heliocentric radial velocity of 19.0 km/s. At its current distance, Chi Fornacis' brightness is diminshed by an interstellar extinction of 0.08 magnitudes and it has an absolute magnitude of +1.42.

Chi Fornacis has a stellar classification of A1 IV, indicating that it is a slightly evolved A-type star that is ceasing hydrogen fusion at its core. Alternatively, it has been given a class of A1 Vbn, indicating that it is instead a slightly less luminous A-type main-sequence star with broad or nebulous absorption lines due to rapid rotation. It has 2.05 times the mass of the Sun and 2.20 times the radius of the Sun. It radiates 31.24 times the luminosity of the Sun from its photosphere at an effective temperature of 8,870 K. Chi Fornacis has a solar metallicity and it is estimated to be only 5.5 million years old. It spins rapidly with a projected rotational velocity of 136 km/s.

It is the brightest star and titular member in the χ Fornacis cluster, a star cluster around 104 parsecs from Earth.

χ Fornacis cluster

The χ Fornacis cluster, or Alessi 13, is one of the four star clusters known within 110 parsecs from Earth. Despite its closeness, the χ Fornacis cluster has barely been studied. Its age is 40 million years and its distance is 104 parsecs. The χ Fornacis cluster appears to be closely related to the Tucana–Horologium and Columba associations. A remarkable, unprecedented aspect of the cluster is the large percentage of M-type stars with warm excess infrared emission due to orbiting dust grains.

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. ^ Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. eISSN 1432-0746. ISSN 0004-6361. S2CID 55586789.
4. ^ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. Vol. 3. Bibcode:1982mcts.book.....H.
5. 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.
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. ^ Bochanski, John J.; Faherty, Jacqueline K.; Gagné, Jonathan; Nelson, Olivia; Coker, Kristina; Smithka, Iliya; Desir, Deion; Vasquez, Chelsea (12 March 2018). "Fundamental Properties of Co-moving Stars Observed byGaia". The Astronomical Journal. 155 (4): 149. arXiv:1801.00537. Bibcode:2018AJ....155..149B. doi:10.3847/1538-3881/aaaebe. eISSN 1538-3881. S2CID 119256051.
9. ^ Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 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. ^ Royer, F.; Gerbaldi, M.; Faraggiana, R.; Gómez, A. E. (January 2002). "Rotational velocities of A-type stars. I. Measurement of vsini in the southern hemisphere". Astronomy & Astrophysics. 381 (1): 105–121. arXiv:astro-ph/0110490. Bibcode:2002A&A...381..105R. doi:10.1051/0004-6361:20011422. eISSN 1432-0746. ISSN 0004-6361.
12. ^ Ujjwal, K.; Kartha, Sreeja S.; Mathew, Blesson; Manoj, P.; Narang, Mayank (Apr 1, 2020). "Analysis of Membership Probability in Nearby Young Moving Groups with Gaia DR2". The Astronomical Journal. 159 (4): 166. arXiv:2002.04801. Bibcode:2020AJ....159..166U. doi:10.3847/1538-3881/ab76d6. ISSN 0004-6256.
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. "*chi01 Fornacis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 3, 2024.
15. 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.
16. Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001). "A spectroscopic survey for λ Bootis stars". Astronomy & Astrophysics. 373 (2): 625–632. Bibcode:2001A&A...373..625P. doi:10.1051/0004-6361:20010630. eISSN 1432-0746. ISSN 0004-6361.
17. ^ Zuckerman, B.; Klein, Beth; Kastner, Joel (2019). "The Nearby, Young, χ Fornacis Cluster: Membership, Age, and an Extraordinary Ensemble of Dusty Debris Disks". The Astrophysical Journal. 887 (1). 87. arXiv:1909.08764. Bibcode:2019ApJ...887...87Z. doi:10.3847/1538-4357/ab45ea.
18. P. A. B. Galli; H. Bouy; J. Olivares; N. Miret-Roig; L. M. Sarro; D. Barrado; A. Berihuete (2021). "χ Fornacis cluster DANCe: Census of stars, structure, and kinematics of the cluster with Gaia-EDR3" (PDF). Astronomy and Astrophysics. 654. A122. doi:10.1051/0004-6361/202141366. Retrieved 28 November 2023.

v t e Constellation of Fornax
List of stars in Fornax Fornax in Chinese astronomy Chandra Deep Field South Hubble Legacy Field
Stars	Bayer α (Dalim) β γ γ δ ε ζ η η η ι ι κ λ λ μ ν π ρ σ τ υ φ χ χ χ ψ ω Variable R TZ UZ HR 683 858 HD 15337 20781 20782 20868 (Intan) Other 2MASS J02431371−2453298 HIP 13044 LP 944-20 UDF 2457 WASP-72 (Diya)
Exoplanets HD 16417 b HD 20781 b c d e HD 20782 b HD 20868 b (Baiduri) TOI-849 b
Star clusters NGC 1049
Nebulae NGC 1360
Galaxies	NGC 823 824 922 986 1097 1210 1255 1288 1310 1316 1317 1318 1326 1350 1365 1374 1375 1379 1380 1381 1387 1398 1399 1406 1425 1427 Other Fornax Dwarf HUDF-JD2 GS-NDG-9422 IC 335 IC 1993 JADES-GS-z14-0 JADES-GS-z7-01-QU MRC 0316-257 PGC 13809 UDF 423 UDFj-39546284 UDFy-38135539
Galaxy clusters Fornax Cluster
Astronomical events SN 1992bd SN 1999eu SN 2003B
Category

• Fornax
• Bayer objects
• Gould objects
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects
• A-type main-sequence stars