Binary star in the constellation Camelopardalis
HD 89571 (HR 4062 ) is a binary star located in the northern circumpolar constellation Camelopardalis . It is faintly visible to the naked eye with a combined apparent magnitude of 5.51 and is estimated to be 142 light years away from the Solar System . However, it is receding with a heliocentric radial velocity of 3.5 km/s .
The primary has a stellar classification of A9 V, indicating that it is an ordinary A-type main-sequence star . David S. Evans gave it a slightly warmer class of A6 V while Cowley et al. classified it as F0 IV, 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 .
The components have masses of 1.69 M ☉ M ☉ M-type star . HD 89571 has a radius of 1.79 R ☉ luminosity of 8.4 L ☉ effective temperature of 7,535 K , giving a white hue. It is estimated to be 710 million years old and spins rapidly with a projected rotational velocity of 134 km/s ; it has a near solar metallicity , equating to an iron abundance 110% that of the Sun .
References
^ 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 .
^ 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 .
^ 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 .
^ Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". International Astronomical Union 30 : 57. Bibcode :1967IAUS...30...57E .
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 . S2CID 119257644 .
^ 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 .
^ 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 .
^ 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 .
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 .
^ 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 .
^ 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 .
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 .
Evans, D. S. (1966). "Fundamental data for Southern stars (6th list)". Royal Greenwich Observatory Bulletins . 110 : 185. Bibcode :1966RGOB..110..185E .
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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