HD 129899

HD 129899
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Apus
Right ascension 14h 51m 30.03619s[1]
Declination −77° 10′ 33.4952″[1]
Apparent magnitude (V) 6.44[2] (6.46 - 6.47)[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type Ap Si[5]
B−V color index −0.03[2]
Variable type suspected α2 CVn[3]
Astrometry
Radial velocity (Rv)2.5±0.7[6] km/s
Proper motion (μ) RA: −14.060 mas/yr[1]
Dec.: −10.327 mas/yr[1]
Parallax (π)3.5129 ± 0.028 mas[1]
Distance928 ± 7 ly
(285 ± 2 pc)
Absolute magnitude (MV)−0.57[7]
Absolute bolometric
magnitude (Mbol)		−1.28[8]
Details
Mass3.43±0.19[4] M☉
Radius4.95[9] R☉
Luminosity190+61
−46[10] L☉
Surface gravity (log g)3.81[8] cgs
Temperature10,617+500
−479[10] K
Metallicity [Fe/H]−0.01[11] dex
Rotation1.035 d[10]
Rotational velocity (v sin i)199±30[10] km/s
Age229+28
−25[4] Myr
Other designations
15 G. Apodis[12], CD−76°677, CPD−76°894, GC 19920, HD 129899, HIP 72670, SAO 257202, TIC 402517183[13]
Database references
SIMBADdata

HD 129899 (HIP 72670; 15 G. Apodis), is a solitary star located in the southern circumpolar constellation Apus, the bird-of-paradise. It has an apparent magnitude of 6.44,[2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively far at a distance of 928 light-years based on Gaia DR3 parallax measurements[1] and it is receding with a heliocentric radial velocity of 2.5 km/s.[6] At its current distance, HD 129899's brightness is heavily diminished by an interstellar extinction of 0.55 magnitudes[14] and it has an absolute bolometric magnitude of −1.28.[8]

HD 129899 has a stellar classification of ApSi,[5] indicating that it is an Ap star with an overabundance of silicon in its spectrum. It has 3.43 times the mass of the Sun[4] and 4.95 times the radius of the Sun.[9] It radiates 190 times the luminosity of the Sun from its photosphere at an effective temperature of 10,617 K,[10] giving it a bluish-white hue when viewed in the night sky. It has a near solar metallicity, having an iron abundance of [Fe/H] = −0.01 or 97.7% of the Sun's.[11] At the age of 229 million years, HD 129899 has completed 95% of its main sequence lifetime.[4] Unlike most chemically peculiar stars, HD 129899 spins rapidly with a rotational velocity of 199 km/s.[10]

The object was observed to be an Alpha2 Canum Venaticorum variable that fluctuates between 6.46 and 6.47 within 1.03 days,[3] which corresponds to the period of the rotation. However, this has not been confirmed. HD 129899 has a relatively weak magnetic field of approximately 402±48 gauss.[15]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Hummerich2016 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Kochukov2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Bidelman1973 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Glagolevskij2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Shulyak2014 was invoked but never defined (see the help page).
  10. ^ a b c d e f Cite error: The named reference Netopli2017 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Anders2022 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Bychkov2009 was invoked but never defined (see the help page).