Astronomy:Chi1 Fornacis

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Short description: Star in the constellation Fornax
For other stars with a similar Bayer designation, see χ Fornacis.
χ1 Fornacis
Location of χ1 Fornacis (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Fornax
Right ascension  03h 25m 55.84196s[1]
Declination −35° 55′ 15.1876″[1]
Apparent magnitude (V) 6.39±0.01[2]
Characteristics
Evolutionary stage main sequence star[3]
Spectral type A1 IV[4]
B−V color index +0.08[5]
Astrometry
Radial velocity (Rv)19.0±0.5[6] km/s
Proper motion (μ) RA: +36.770[1] mas/yr
Dec.: −4.641[1] mas/yr
Parallax (π)9.6154 ± 0.0266[1] mas
Distance339.2 ± 0.9 ly
(104.0 ± 0.3 pc)
Absolute magnitude (MV)+1.42[7]
Details
Mass2.05±0.08[8] M☉
Radius2.20±0.11[9] R☉
Luminosity31.24+3.43−3.09[3] L☉
Surface gravity (log g)4.08±0.07[10] cgs
Temperature8,770+122−120[3] K
Metallicity [Fe/H]0.00+0.02−0.04[8] dex
Rotational velocity (v sin i)136[11] km/s
Age5.5±0.5[12] Myr
Other designations
χ1 For, NSV 1162, CD−36°1290, CPD−36°350, GC 4097, HD 21573, HIP 15987, HR 1042, SAO 194289[13]
Database references
SIMBADFor data

Chi1 Fornacis, Latinised from χ1 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,[2] which is near the limit for naked eye visibility. Gaia DR3 parallax measurements imply a distance of 339 light-years[1] and it is currently drifting away with a heliocentric radial velocity of 19.0 km/s.[6] At its current distance, Chi1 Fornacis' brightness is diminished by an interstellar extinction of 0.08 magnitudes[14] and it has an absolute magnitude of +1.42.[7]

Chi1 Fornacis has a stellar classification of A1 IV,[4] 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,[15] 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[8] and 2.20 times the radius of the Sun.[9] It radiates 31.24 times the luminosity of the Sun from its photosphere at an effective temperature of 8,870 K.[3] Chi1 Fornacis has a solar metallicity[8] and it is estimated to be only 5.5 million years old.[12] It spins rapidly with a projected rotational velocity of 136 km/s.[11]

It is the brightest star and titular member in the χ1 Fornacis cluster, a star cluster around 104 parsecs from Earth.[16]

χ1 Fornacis cluster

The χ1 Fornacis cluster, or Alessi 13,[17] is one of the four star clusters known within 110 parsecs from Earth. [16] Despite its closeness, the χ1 Fornacis cluster has barely been studied. Its age is 40 million years and its distance is 104 parsecs.[16] The χ1 Fornacis cluster appears to be closely related to the Tucana–Horologium and Columba associations.[16] 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.[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 3.2 3.3 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. 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. ↑ 6.0 6.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.3847/1538-3881/aaaebe. Bibcode: 2018AJ....155..149B. 
  9. ↑ 9.0 9.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  10. ↑ Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  11. ↑ 11.0 11.1 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. doi:10.1051/0004-6361:20011422. ISSN 0004-6361. Bibcode: 2002A&A...381..105R. 
  12. ↑ 12.0 12.1 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. doi:10.3847/1538-3881/ab76d6. ISSN 0004-6256. Bibcode: 2020AJ....159..166U. 
  13. ↑ "*chi01 Fornacis". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2Achi01+Fornacis. 
  14. ↑ 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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  15. ↑ 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. doi:10.1051/0004-6361:20010630. ISSN 0004-6361. Bibcode: 2001A&A...373..625P. 
  16. ↑ 16.0 16.1 16.2 16.3 16.4 Zuckerman, B.; Klein, Beth; Kastner, Joel (2019). "The Nearby, Young, χ1 Fornacis Cluster: Membership, Age, and an Extraordinary Ensemble of Dusty Debris Disks". The Astrophysical Journal 887 (1): 87. doi:10.3847/1538-4357/ab45ea. Bibcode: 2019ApJ...887...87Z. 
  17. ↑ P. A. B. Galli; H. Bouy; J. Olivares; N. Miret-Roig; L. M. Sarro; D. Barrado; A. Berihuete (2021). "χ1 Fornacis cluster DANCe: Census of stars, structure, and kinematics of the cluster with Gaia-EDR3". Astronomy and Astrophysics 654: A122. doi:10.1051/0004-6361/202141366. Bibcode: 2021A&A...654A.122G. https://www.aanda.org/articles/aa/pdf/2021/10/aa41366-21.pdf. Retrieved 28 November 2023. 
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