Astronomy:5 Tauri
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Short description: Binary star system in the constellation Taurus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 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 2.4 2.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 6.2 6.3 ESA (1997). "The Hipparcos and Tycho Catalogues". VizieR On-line Data Catalog. Bibcode: 1997yCat.1239....0E.
- ↑ 7.0 7.1 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, doi:10.1051/0004-6361:20021736, Bibcode: 2003A&A...398.1163P
- ↑ Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 9.0 9.1 9.2 9.3 Earle Luck, R. (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal 147 (6): 137. doi:10.1088/0004-6256/147/6/137. Bibcode: 2014AJ....147..137L.
- ↑ 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=5+Tau.
External links
- "HD 21754 -- Spectroscopic binary". SIMBAD Astronomical Database. http://simbad.u-strasbg.fr/sim-id.pl?protocol=html&Ident=5+tauri.
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