HD 89571

Last updated
HD 89571
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis [1]
Right ascension 10h 29m 41.6297s [2]
Declination +84° 15′ 06.949″ [2]
Apparent magnitude  (V)5.51±0.01 [3]
Characteristics
Spectral type A9 V [4]
U−B color index +0.06 [3]
B−V color index +0.23 [3]
Astrometry
Radial velocity (Rv)3.5±2 [5] km/s
Proper motion (μ)RA: −145.145 mas/yr [2]
Dec.: −21.494 mas/yr [2]
Parallax (π)23.0490±0.3729  mas [2]
Distance 142 ± 2  ly
(43.4 ± 0.7  pc)
Absolute magnitude  (MV)+2.48 [1]
Orbit [6]
PrimaryA
CompanionB
Period (P)2.20±0.03 yr
Semi-major axis (a)0.0142±0.0006″
Eccentricity (e)0.26±0.11
Details
A
Mass 1.69 [7]   M☉
Radius 1.79 [2]   R☉
Luminosity 8.4 [8]   L☉
Surface gravity (log g)4.27 [9]   cgs
Temperature 7,535 [10]   K
Metallicity [Fe/H]+0.04 [11]   dex
Rotational velocity (v sin i)134±7 [10]  km/s
Age 710 [7]   Myr
B
Mass 0.38 [7]   M☉
Other designations
AG+84°229, BD+84°234, GC 14305, HD 89571, HIP 51384, HR 4062, SAO 1701, WDS J10297+8415AB
Database references
SIMBAD data

HD 89571 (HR 4062) is a binary star [12] located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye with a combined apparent magnitude of 5.51 [3] and is estimated to be 142 light years [2] away from the Solar System. However, it is receding with a heliocentric radial velocity of 3.5  km/s . [5]

The primary has a stellar classification of A9 V, [4] indicating that it is an ordinary A-type main-sequence star. David S. Evans gave it a slightly warmer class of A6 V [13] while Cowley et al. classified it as F0 IV, [14] indicating a F-type subgiant. Nevertheless, the two components take roughly 2 years to orbit each other at a mean separation of 14.2  mas . [6]

The components have masses of 1.69  M☉ and 0.38  M☉ , [7] with the latter being a probable M-type star. HD 89571 has a radius of 1.79  R☉ [2] and a luminosity of 8.4  L☉ . [8] This yields an effective temperature of 7,535  K , [10] giving a white hue. It is estimated to be 710 million years old [7] and spins rapidly with a projected rotational velocity of 134  km/s ; [10] it has a near solar metallicity, equating to an iron abundance 110% that of the Sun. [11]

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  3. 1 2 3 4 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89: 415. Bibcode:1991A&AS...89..415O. ISSN   0365-0138.
  4. 1 2 Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi: 10.1086/192182 . ISSN   0067-0049.
  5. 1 2 Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". International Astronomical Union . 30: 57. Bibcode:1967IAUS...30...57E.
  6. 1 2 Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (October 2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi: 10.1051/0004-6361/201219774 . eISSN   1432-0746. ISSN   0004-6361.
  7. 1 2 3 4 5 De Rosa, R. J.; Patience, J.; Wilson, P. A.; Schneider, A.; Wiktorowicz, S. J.; Vigan, A.; Marois, C.; Song, I.; Macintosh, B.; Graham, J. R.; Doyon, R.; Bessell, M. S.; Thomas, S.; Lai, O. (26 November 2013). "The VAST Survey – III. The multiplicity of A-type stars within 75 pc". Monthly Notices of the Royal Astronomical Society. 437 (2): 1216–1240. arXiv: 1311.7141 . Bibcode:2014MNRAS.437.1216D. doi: 10.1093/mnras/stt1932 . eISSN   1365-2966. ISSN   0035-8711.
  8. 1 2 Chandler, Colin Orion; McDonald, Iain; Kane, Stephen R. (17 February 2016). "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars". The Astronomical Journal. 151 (3): 59. arXiv: 1510.05666 . Bibcode:2016AJ....151...59C. doi: 10.3847/0004-6256/151/3/59 . eISSN   1538-3881.
  9. ↑ Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002 . Bibcode:1999A&A...352..555A. ISSN   0004-6361.
  10. 1 2 3 4 Reiners, A. (January 2006). "Rotation- and temperature-dependence of stellar latitudinal differential rotation". Astronomy & Astrophysics. 446 (1): 267–277. arXiv: astro-ph/0509399 . Bibcode:2006A&A...446..267R. doi: 10.1051/0004-6361:20053911 . eISSN   1432-0746. ISSN   0004-6361.
  11. 1 2 Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv: 1705.00883 . Bibcode:2017MNRAS.469.3042N. doi: 10.1093/mnras/stx1077 . eISSN   1365-2966. ISSN   0035-8711.
  12. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . eISSN   1365-2966. ISSN   0035-8711.
  13. ↑ Evans, D. S. (1966). "Fundamental data for Southern stars (6th list)". Royal Greenwich Observatory Bulletins. 110: 185. Bibcode:1966RGOB..110..185E.
  14. ↑ Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode:1969AJ.....74..375C. doi: 10.1086/110819 . ISSN   0004-6256.
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