Astronomy:66 Tauri
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Short description: Star in the constellation Taurus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 23m 51.82553s[1] |
| Declination | +09° 27′ 39.4939″[1] |
| Apparent magnitude (V) | 5.098[2] (5.8 / 5.9)[3] |
| Characteristics | |
| Spectral type | A3V + A4V[4] |
| U−B color index | +0.10[5] |
| B−V color index | +0.07[5] |
| Astrometry | |
| Radial velocity (Rv) | −8.70±1[6] km/s |
| Proper motion (μ) | RA: −20.32[1] mas/yr Dec.: −5.32[1] mas/yr |
| Parallax (π) | 8.24 ± 0.31[1] mas |
| Distance | 400 ± 10 ly (121 ± 5 pc) |
| Absolute magnitude (MV) | −0.32[7] |
| Orbit[3] | |
| Period (P) | 54.77 yr |
| Semi-major axis (a) | 0.188″ |
| Eccentricity (e) | 0.720 |
| Inclination (i) | 34.2° |
| Longitude of the node (Ω) | 239.8° |
| Periastron epoch (T) | 1937.24 |
| Argument of periastron (ω) (secondary) | 332.0° |
| Details | |
| 66 Tau A | |
| Mass | 2.89[8][note 1] M☉ |
| Rotational velocity (v sin i) | 81[9] km/s |
| 66 Tau B | |
| Mass | 2.76[8][note 1] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
66 Tauri, also known as r Tauri, is a binary star in the constellation of Taurus. The combined apparent magnitude of the system is 5.098,[2] with the magnitudes of the two components being 5.8 and 5.9, respectively.[3] Parallax measurements by Hipparcos put 66 Tauri at some 400 light-years (121 parsecs) away.[1]
This is a visual binary where the positions of the two stars are tracked over time, and used to calculate an orbit. The two stars orbit each other every 55 years.[3] Their orbit is fairly eccentric, at 0.720, and the two stars are separated by 0.188″ on average.[3] Both stars are A-type main-sequence stars with similar masses.[8]
Notes
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL.
- ↑ 2.0 2.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 3.2 3.3 3.4 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.
- ↑ Christy, James W.; Walker, R. L. Jr. (1969). "MK Classification of 142 Visual Binaries". Publications of the Astronomical Society of the Pacific 81 (482): 643. doi:10.1086/128831. Bibcode: 1969PASP...81..643C.
- ↑ 5.0 5.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 8.0 8.1 8.2 Cvetkovic, Z.; Ninkovic, S. (2010). "On the Component Masses of Visual Binaries". Serbian Astronomical Journal 180 (180): 71–80. doi:10.2298/SAJ1080071C. Bibcode: 2010SerAJ.180...71C.
- ↑ Royer, F.; Zorec, J.; Gómez, A. E. (2007). "Rotational velocities of A-type stars". Astronomy and Astrophysics 463 (2): 671. doi:10.1051/0004-6361:20065224. Bibcode: 2007A&A...463..671R.
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