Astronomy:HD 29559
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas/yr Dec.: +49.716[1] mas/yr |
| Parallax (π) | 7.9974 ± 0.0193[1] mas |
| Distance | 407.8 ± 1.0 ly (125.0 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.03[6] |
| Details | |
| Mass | 2.19±0.04[3] M☉ |
| Radius | 3.17±0.08[7] R☉ |
| Luminosity | 35±3[3] L☉ |
| Surface gravity (log g) | 3.7±0.1[7] cgs |
| Temperature | 7,852±36[3] K |
| Metallicity [Fe/H] | −0.01[8] dex |
| Rotational velocity (v sin i) | 176±5[9] km/s |
| Age | 719[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 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.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z.
- ↑ 4.0 4.1 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. doi:10.1086/191349. ISSN 0067-0049. Bibcode: 1989ApJS...70..623G.
- ↑ 5.0 5.1 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.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
- ↑ 8.0 8.1 8.2 8.3 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 0320-0108. Bibcode: 2012AstL...38..771G.
- ↑ 9.0 9.1 Royer, F.; Gerbaldi, M.; Faraggiana, R.; Gómez, A. E. (January 2002). "Rotational velocities of A-type stars". Astronomy & Astrophysics 381 (1): 105–121. doi:10.1051/0004-6361:20011422. ISSN 0004-6361. Bibcode: 2002A&A...381..105R.
- ↑ "HD 29559". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+29559.
- ↑ 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.
- ↑ 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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