HD 129899

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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]
Distance 928 ± 7  ly
(285 ± 2  pc)
Absolute magnitude  (MV)−0.57 [7]
Absolute bolometric
magnitude  (Mbol)		−1.28 [8]
Details
Mass 3.43±0.19 [4]   M☉
Radius 4.95 [9]   R☉
Luminosity 190+61
−46 [10]   L☉
Surface gravity (log g)3.81 [8]   cgs
Temperature 10,617+500
−479 [10]   K
Metallicity [Fe/H]−0.01 [11]   dex
Rotation 1.035  d [10]
Rotational velocity (v sin i)199±30 [10]  km/s
Age 229+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
SIMBAD data

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]

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References

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  5. 1 2 Bidelman, W. P.; MacConnel, D. J. (October 1973). "The brighter stars of astrophysical interest in the southern sky". The Astronomical Journal. 78: 687. Bibcode:1973AJ.....78..687B. doi: 10.1086/111475 . ISSN   0004-6256.
  6. 1 2 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. 1 2 3 Glagolevskij, Yu. V. (January 2019). "On Properties of Main Sequence Magnetic Stars". Astrophysical Bulletin. 74 (1): 66–79. Bibcode:2019AstBu..74...66G. doi:10.1134/S1990341319010073. eISSN   1990-3421. ISSN   1990-3413. S2CID   149900274.
  9. 1 2 Shulyak, D.; Paladini, C.; Causi, G. Li; Perraut, K.; Kochukhov, O. (July 23, 2014). "Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities". Monthly Notices of the Royal Astronomical Society. 443 (2): 1629. arXiv: 1406.6093 . Bibcode:2014MNRAS.443.1629S. doi: 10.1093/mnras/stu1259 . S2CID   96452769.
  10. 1 2 3 4 5 6 Netopil, Martin; Paunzen, Ernst; Hümmerich, Stefan; Bernhard, Klaus (17 March 2017). "An investigation of the rotational properties of magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 468 (3): 2745–2756. arXiv: 1703.05218 . Bibcode:2017MNRAS.468.2745N. doi: 10.1093/mnras/stx674 . eISSN   1365-2966. ISSN   0035-8711. S2CID   119215348.
  11. 1 2 Anders, F.; et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics. 658: A91. arXiv: 2111.01860 . Bibcode:2022A&A...658A..91A. doi: 10.1051/0004-6361/202142369 . eISSN   1432-0746. ISSN   0004-6361.
  12. ↑ 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.
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  15. ↑ Bychkov, V. D.; Bychkova, L. V.; Madej, J. (April 11, 2009). "Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars". Monthly Notices of the Royal Astronomical Society. 394 (3): 1338. Bibcode:2009MNRAS.394.1338B. doi: 10.1111/j.1365-2966.2008.14227.x . S2CID   120268049.
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