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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]
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
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]

References

  1. ^ a b c d e 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.
  2. ^ a b c Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN  0004-6361. S2CID  17128864.
  3. ^ a b c Hümmerich, Stefan; Paunzen, Ernst; Bernhard, Klaus (October 1, 2016). "New Photometrically Variable Magnetic Chemically Peculiar Stars in the ASAS-3 Archive". The Astronomical Journal. 152 (4): 104. arXiv: 1610.08253. Bibcode: 2016AJ....152..104H. doi: 10.3847/0004-6256/152/4/104. ISSN  0004-6256. S2CID  118449879.
  4. ^ a b c d e Kochukhov, O.; Bagnulo, S. (10 April 2006). "Evolutionary state of magnetic chemically peculiar stars". Astronomy and Astrophysics. 450 (2): 763–775. arXiv: astro-ph/0601461. Bibcode: 2006A&A...450..763K. doi: 10.1051/0004-6361:20054596. eISSN  1432-0746. ISSN  0004-6361. S2CID  18596834.
  5. ^ a b 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. ^ a b 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. ^ a b c 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. ^ a b 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. ^ a b c d e f 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. ^ a b 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.
  13. ^ "HD 129899". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 20, 2015.
  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. arXiv: 1709.01160. Bibcode: 2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219. eISSN  1365-2966. ISSN  0035-8711. S2CID  118879856.
  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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