Astronomy: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 |
| Distance | 142 ± 2 ly (43.4 ± 0.7 pc) |
| Absolute magnitude (MV) | +2.48[5] |
| Orbit[6] | |
| Primary | A |
| Companion | B |
| 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[1] 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 | |
| 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[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
- ↑ 1.0 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. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 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. Bibcode: 1991A&AS...89..415O.
- ↑ 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. Bibcode: 1995ApJS...99..135A.
- ↑ 4.0 4.1 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. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 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. Bibcode: 2012A&A...546A..69M.
- ↑ 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. Bibcode: 2014MNRAS.437.1216D.
- ↑ 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. Bibcode: 2016AJ....151...59C.
- ↑ 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. Bibcode: 1999A&A...352..555A.
- ↑ 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. Bibcode: 2006A&A...446..267R.
- ↑ 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. Bibcode: 2017MNRAS.469.3042N.
- ↑ 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. Bibcode: 2008MNRAS.389..869E.
- ↑ 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. doi:10.1086/110819. ISSN 0004-6256. Bibcode: 1969AJ.....74..375C.
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