Astronomy:HD 129899

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Short description: Ap star in the constellation Apus.
HD 129899
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas/yr
Dec.: −10.327[1] mas/yr
Parallax (π)3.5129 ± 0.028[1] mas
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
CD−76°677, CPD−76°894, GC 19920, HD 129899, HIP 72670, SAO 257202[12]
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[13] 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.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 3.2 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. doi:10.3847/0004-6256/152/4/104. ISSN 0004-6256. Bibcode: 2016AJ....152..104H. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Kochukhov, O.; Bagnulo, S. (10 April 2006). "Evolutionary state of magnetic chemically peculiar stars". Astronomy and Astrophysics 450 (2): 763–775. doi:10.1051/0004-6361:20054596. ISSN 0004-6361. Bibcode: 2006A&A...450..763K. 
  5. ↑ 5.0 5.1 Bidelman, W. P.; MacConnel, D. J. (October 1973). "The brighter stars of astrophysical interest in the southern sky.". The Astronomical Journal 78: 687. doi:10.1086/111475. ISSN 0004-6256. Bibcode: 1973AJ.....78..687B. 
  6. ↑ 6.0 6.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  7. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 8.2 Glagolevskij, Yu. V. (January 2019). "On Properties of Main Sequence Magnetic Stars". Astrophysical Bulletin 74 (1): 66–79. doi:10.1134/S1990341319010073. ISSN 1990-3413. Bibcode: 2019AstBu..74...66G. 
  9. ↑ 9.0 9.1 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. doi:10.1093/mnras/stu1259. Bibcode: 2014MNRAS.443.1629S. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 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. doi:10.1093/mnras/stx674. ISSN 0035-8711. Bibcode: 2017MNRAS.468.2745N. 
  11. ↑ 11.0 11.1 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. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A. 
  12. ↑ "HD 129899". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+129899. 
  13. ↑ 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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  14. ↑ 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. doi:10.1111/j.1365-2966.2008.14227.x. Bibcode: 2009MNRAS.394.1338B. 
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