Astronomy:HD 89571

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Short description: Binary star in the constellation Camelopardalis
HD 89571
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  10h 29m 41.6297s[1]
Declination +84° 15′ 06.949″[1]
Apparent magnitude (V) 5.51±0.01[2]
Characteristics
Spectral type A9 V[3]
U−B color index +0.06[2]
B−V color index +0.23[2]
Astrometry
Radial velocity (Rv)3.5±2[4] km/s
Proper motion (μ) RA: −145.145[1] mas/yr
Dec.: −21.494[1] mas/yr
Parallax (π)23.0490 ± 0.3729[1] mas
Distance142 ± 2 ly
(43.4 ± 0.7 pc)
Absolute magnitude (MV)+2.48[5]
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
Mass1.69[7] M
Radius1.79[1] R
Luminosity8.4[8] L
Surface gravity (log g)4.27[9] cgs
Temperature7,535[10] K
Metallicity [Fe/H]+0.04[11] dex
Rotational velocity (v sin i)134±7[10] km/s
Age710[7] Myr
B
Mass0.38[7] M
Other designations
Database references
SIMBADdata

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[2] and is estimated to be 142 light years[1] away from the Solar System. However, it is receding with a heliocentric radial velocity of 3.5 km/s.[4]

The primary has a stellar classification of A9 V,[3] 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[1] and a luminosity of 8.4 solar luminosity.[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. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI.". Astronomy and Astrophysics Supplement Series 89: 415. ISSN 0365-0138. Bibcode1991A&AS...89..415O. 
  3. 3.0 3.1 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. doi:10.1086/192182. ISSN 0067-0049. Bibcode1995ApJS...99..135A. 
  4. 4.0 4.1 Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". International Astronomical Union 30: 57. Bibcode1967IAUS...30...57E. 
  5. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode2012AstL...38..331A. 
  6. 6.0 6.1 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. doi:10.1051/0004-6361/201219774. ISSN 0004-6361. Bibcode2012A&A...546A..69M. 
  7. 7.0 7.1 7.2 7.3 7.4 De Rosa, R. J.; Patience, J.; Wilson, P. A.; Schneider, A.; Wiktorowicz, S. J.; Vigan, A.; Marois, C.; Song, I. et al. (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. doi:10.1093/mnras/stt1932. ISSN 0035-8711. Bibcode2014MNRAS.437.1216D. 
  8. 8.0 8.1 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. doi:10.3847/0004-6256/151/3/59. Bibcode2016AJ....151...59C. 
  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. ISSN 0004-6361. Bibcode1999A&A...352..555A. 
  10. 10.0 10.1 10.2 10.3 Reiners, A. (January 2006). "Rotation- and temperature-dependence of stellar latitudinal differential rotation". Astronomy & Astrophysics 446 (1): 267–277. doi:10.1051/0004-6361:20053911. ISSN 0004-6361. Bibcode2006A&A...446..267R. 
  11. 11.0 11.1 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. doi:10.1093/mnras/stx1077. ISSN 0035-8711. Bibcode2017MNRAS.469.3042N. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode2008MNRAS.389..869E. 
  13. Evans, D. S. (1966). "Fundamental data for Southern stars (6th list).". Royal Greenwich Observatory Bulletins 110: 185. Bibcode1966RGOB..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. doi:10.1086/110819. ISSN 0004-6256. Bibcode1969AJ.....74..375C.