Wikipedia

HD 129899

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
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 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

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  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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