HD 113703

Last updated
f Centauri
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Centaurus [1]
Right ascension 13h 06m 16.70s [2]
Declination −48° 27′ 47.8″ [2]
Apparent magnitude  (V)+4.71 [1]
Characteristics
Evolutionary stage Main sequence [2]
Spectral type B4V [3] + K0Ve [4]
U−B color index −0.562 [1]
B−V color index −0.148±0.006 [1]
Astrometry
Radial velocity (Rv)+6.0±4.2 [5] km/s
Proper motion (μ)RA: −29.558 [2] mas/yr
Dec.: −15.692 [2] mas/yr
Parallax (π)8.1592±0.1559  mas [2]
Distance 400 ± 8  ly
(123 ± 2  pc)
Absolute magnitude  (MV)−0.68 [1]
Details
f Cen Aa
Mass 4.39 [6]   M☉
Surface gravity (log g)3.99 [6]   cgs
Temperature 14,769 [6]   K
Rotational velocity (v sin i)140±7 [7]  km/s
Age 92 [6]   Myr
f Cen C
Mass 0.9 [8]   M☉
Luminosity0.49 [8]   L☉
Temperature 5,020 [8]   K
Age 50 [8]   Myr
Other designations
f Cen, CD−47°8088, GC 17750, HD 113703, HIP 63945, HR 4940, SAO 223900, CCDM J13063-4828
Database references
SIMBAD data

HD 113703, also known by the Bayer designation f Centauri, is a multiple star [9] system in the southern constellation of Centaurus. The combined apparent visual magnitude of this system is +4.71, [1] which is sufficient to make it faintly visible to the naked eye. The distance to this system is approximately 400 light years based on parallax measurements. It is a member of the Lower Centaurus Crux subgroup of the Scorpius–Centaurus association. [6]

The primary of f Centauri is a blue-white hued B-type main-sequence star with a stellar classification of B4V. [3] It is a young star with an age estimated at around 92 million years, [6] and is spinning rapidly with a projected rotational velocity of 140 km/s. [7] A close companion with a K magnitude of 9.16, designated component C, was detected in 2002 at an angular separation of 1.55″ . [10] In 2013, a spectroscopic companion to the primary was observed using long baseline interferometry, with the two being designated components Aa and Ab. [11]

A faint, magnitude 10.8 companion, component B, was first reported by J. F. W. Herschel in 1836. As of 2015, it was located at a separation of 11.6″ along a position angle of 78°. [12] This is a K-type star with a class of K0Ve, showing emission in the Calcium H and K lines. It is a known BY Draconis variable star with the designation V1155 Centauri. [13] It shares a common space motion with the primary, indicating a probable physical relationship, and its Gaia Data Release 3 parallax of 7.965″ ±0.018″ suggests a distance of 409 light years. [14] The star shows a strong overabundance in lithium, which demonstrates its young age. [4] It is about 0.8 magnitudes above zero age main sequence and thus is still contracting as a post-T Tauri star. [15] X-ray emission has been detected from this star. [8]

References

  1. 1 2 3 4 5 6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 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.
  3. 1 2 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 2. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
  4. 1 2 Catchpole, R. M. (1971). "A lithium rich star in Sco-Cen". Monthly Notices of the Royal Astronomical Society. 154: 15. Bibcode:1971MNRAS.154P..15C. doi: 10.1093/mnras/154.1.15P .
  5. ↑ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  6. 1 2 3 4 5 6 Goldman, Bertrand; et al. (November 2018). "A Large Moving Group within the Lower Centaurus Crux Association". The Astrophysical Journal. 868 (1): 15. arXiv: 1807.02076 . Bibcode:2018ApJ...868...32G. doi: 10.3847/1538-4357/aae64c . S2CID   119343278. 32.
  7. 1 2 Brown, A. G. A.; Verschueren, W. (March 1997). "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2". Astronomy and Astrophysics. 319: 811–838. arXiv: astro-ph/9608089 . Bibcode:1997A&A...319..811B.
  8. 1 2 3 4 5 Stelzer, B.; et al. (September 2003). "Late B-type stars and their candidate companions resolved with Chandra". Astronomy and Astrophysics. 407 (3): 1067–1078. arXiv: astro-ph/0306401 . Bibcode:2003A&A...407.1067S. doi:10.1051/0004-6361:20030934. S2CID   16766165.
  9. ↑ Eggleton, P. P.; Tokovinin, A. A. (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 . S2CID   14878976.
  10. ↑ Shatsky, N.; Tokovinin, A. (January 2002). "The mass ratio distribution of B-type visual binaries in the Sco OB2 association". Astronomy and Astrophysics. 382: 92–103. arXiv: astro-ph/0109456 . Bibcode:2002A&A...382...92S. doi:10.1051/0004-6361:20011542. S2CID   16697655.
  11. ↑ Rizzuto, A. C.; et al. (December 2013). "Long-baseline interferometric multiplicity survey of the Sco-Cen OB association". Monthly Notices of the Royal Astronomical Society. 436 (2): 1694–1707. arXiv: 1309.3811 . Bibcode:2013MNRAS.436.1694R. doi: 10.1093/mnras/stt1690 .
  12. ↑ Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 .
  13. ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  14. ↑ 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.
  15. ↑ Andrews, P. J.; Thackeray, A. D. (1973). "Absolute magnitudes of B-type primaries in visual binaries". Monthly Notices of the Royal Astronomical Society. 165: 1–9. Bibcode:1973MNRAS.165....1A. doi: 10.1093/mnras/165.1.1 .


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