HD 29559

HD 29559 is a solitary star in the southern constellation Caelum. It has an apparent magnitude of 6.40,[2] placing it near the max naked eye visibility. The star is situated at a distance 408 light years[1] based on parallax measurements but is receding with a heliocentric radial velocity of 24.2 km/s.[5]

HD 29559
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum
Right ascension 04h 37m 19.2681s[1]
Declination −41° 52′ 22.5964″[1]
Apparent magnitude (V) 6.40±0.01[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A5 IV-V[4]
B−V color index +0.15[2]
Astrometry
Radial velocity (Rv)24.2±0.8[5] km/s
Proper motion (μ) RA: +25.296 mas/yr[1]
Dec.: +49.716 mas/yr[1]
Parallax (π)7.9974 ± 0.0193 mas[1]
Distance407.8 ± 1.0 ly
(125.0 ± 0.3 pc)
Absolute magnitude (MV)+1.03[6]
Details
Mass2.19±0.04[3] M☉
Radius3.17±0.08[7] R☉
Luminosity35±3[3] L☉
Surface gravity (log g)3.7±0.1[7] cgs
Temperature7,852±36[3] K
Metallicity [Fe/H]−0.01[8] dex
Rotational velocity (v sin i)176±5[9] km/s
Age719[8] Myr
Other designations
8 G. Caeli, CD−42°1572, CPD−42°507, GC 5653, HD 29559, HIP 21525, SAO 216899[10][11]
Database references
SIMBADdata

HD 29559 has a stellar classification of A5 IV-V[4] — a luminosity class intermediate between a main sequence star and subgiant. It has alternatively been classified as A3 Vs:,[12] indicating that it is an A-type main-sequence star with sharp (narrow) absorption lines due to slow rotation. However, there is uncertainty behind the class.

It has 2.19 times the mass of the Sun[3] and a slightly enlarged diameter of 3.17 R☉.[7] It radiates at 35 times the luminosity of the Sun from its photosphere at an effective temperature of 7,852 K,[3] which gives it a white hue. Contrary to the second classification, HD 29559 spins rapidly with a projected rotational velocity of 176 km/s[9] and has a solar metallicity.[8] It is estimated to be 719 million years old,[8] having completed 85.9% of its main sequence lifetime.[3]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. 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.
  3. Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.
  4. Gray, R. O.; Garrison, R. F. (July 1989). "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". The Astrophysical Journal Supplement Series. 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349. eISSN 1538-4365. ISSN 0067-0049.
  5. 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. ISSN 1063-7737. S2CID 119231169.
  6. 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. ISSN 1063-7737. S2CID 119257644.
  7. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
  8. Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. ISSN 0320-0108. S2CID 118345778.
  9. Royer, F.; Gerbaldi, M.; Faraggiana, R.; Gómez, A. E. (January 2002). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 381 (1): 105–121. arXiv:astro-ph/0110490. Bibcode:2002A&A...381..105R. doi:10.1051/0004-6361:20011422. eISSN 1432-0746. ISSN 0004-6361.
  10. "HD 29559". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 17, 2022.
  11. 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.
  12. Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor: Dept. Of Astronomy. Bibcode:1978mcts.book.....H.
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