HD 113703

This article is about f Centauri. Not to be confused with F Centauri.
f Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 13h 06m 16.70s[1]
Declination −48° 27′ 47.8″[1]
Apparent magnitude (V) +4.71[2]
Characteristics
Evolutionary stage Main sequence
Spectral type B4V[3] + K0Ve[4]
U−B color index −0.562[2]
B−V color index −0.148±0.006[2]
Astrometry
Radial velocity (Rv)+6.0±4.2[5] km/s
Proper motion (μ) RA: −29.558[1] mas/yr
Dec.: −15.692[1] mas/yr
Parallax (π)8.1592 ± 0.1559 mas[1]
Distance400 ± 8 ly
(123 ± 2 pc)
Absolute magnitude (MV)−0.68[2]
Details
f Cen Aa
Mass4.39[6] M☉
Surface gravity (log g)3.99[6] cgs
Temperature14,769[6] K
Rotational velocity (v sin i)140±7[7] km/s
Age92[6] Myr
f Cen C
Mass0.9[8] M☉
Luminosity0.49[8] L☉
Temperature5,020[8] K
Age50[8] Myr
Other designations
f Cen, CD−47°8088, GC 17750, HD 113703, HIP 63945, HR 4940, SAO 223900, CCDM J13063-4828
Database references
SIMBADdata

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,[2] 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]

  1. ^ a b c d e Cite error: The named reference dr3 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Catchpole1971 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference Goldman_et_al_2018 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Brown_Verschueren_1997 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Stelzer_et_al_2003 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Shatsky_Tokovinin_2002 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Rizzuto_et_al_2013 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Mason_et_al_2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference dr3b was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Andrews_Thackeray_1973 was invoked but never defined (see the help page).