5 Tauri
5 Tauri is a binary star[6] in the zodiac constellation of Taurus, located approximately 530 light years from the Sun. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of +4.14. It is moving further from the Earth with a heliocentric radial velocity of +14 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 30m 52.38296s[1] |
| Declination | +12° 56′ 12.0489″[1] |
| Apparent magnitude (V) | +4.14[2] |
| Characteristics | |
| Spectral type | K0-III[3] |
| U−B color index | +0.95[4] |
| B−V color index | +1.09[4] |
| Astrometry | |
| Radial velocity (Rv) | 14.2±0.3[2] km/s |
| Proper motion (μ) | RA: 13.537[1] mas/yr Dec.: -2.037[1] mas/yr |
| Parallax (π) | 6.1081 ± 0.3907[1] mas |
| Distance | 530 ± 30 ly (160 ± 10 pc) |
| Absolute magnitude (MV) | −0.96[2] |
| Orbit[5] | |
| Primary | 5 Tauri A |
| Companion | 5 Tauri B |
| Period (P) | 960 days |
| Semi-major axis (a) | 4.25 mas[6] |
| Eccentricity (e) | 0.397±0.016 |
| Inclination (i) | 36.95[6]° |
| Longitude of the node (Ω) | 207.61[6]° |
| Periastron epoch (T) | 2,414,889.565±5.82 |
| Argument of periastron (ω) (secondary) | 326.32±2.99° |
| Semi-amplitude (K1) (primary) | 8.25±0.15 km/s |
| Details | |
| 5 Tauri A | |
| Mass | 4.0±0.7[7] M☉ |
| Radius | 8.5[8] R☉ |
| Luminosity | 329.38[2] L☉ |
| Surface gravity (log g) | 1.97[9] cgs |
| Temperature | 4,644[9] K |
| Metallicity [Fe/H] | 0.05[9] dex |
| Rotational velocity (v sin i) | 10[10] km/s |
| 5 Tauri B | |
| Mass | 1.13±0.13 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a spectroscopic binary with a period of 960 days and an eccentricity of about 0.4.[5] The primary component is a K-type giant with a stellar classification of K0-III.[3] It has four[7] times the mass of the Sun and is radiating 329[2] times the Sun's luminosity from its photosphere at an effective temperature of 4,644 K.[9]
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.
- 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.
- Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
- Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- Harper, W. E. (June 1924). "The orbit of the spectroscopic binary 5 Tauri". Publications of the Dominion Observatory Ottawa. 3: 145–149. Bibcode:1924PDAO....3..145H.
- ESA (1997). "The Hipparcos and Tycho Catalogues". VizieR On-line Data Catalog. Bibcode:1997yCat.1239....0E.
- Pourbaix, D.; Boffin, H. M. J. (February 2003), "Reprocessing the Hipparcos Intermediate Astrometric Data of spectroscopic binaries. II. Systems with a giant component", Astronomy and Astrophysics, 398 (3): 1163–1177, arXiv:astro-ph/0211483, Bibcode:2003A&A...398.1163P, doi:10.1051/0004-6361:20021736
- Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
- Earle Luck, R. (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
- Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago. 239 (1): 1. Bibcode:1970CoAsi.239....1B.
- "5 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 December 2016.
External links
- "HD 21754 -- Spectroscopic binary". SIMBAD Astronomical Database. Retrieved 2007-01-26.
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