Rho Tucanae
Rho Tucanae (ρ Tuc, ρ Tucanae) is a binary star system in the southern constellation of Tucana. It is visible to the naked eye with a combined apparent visual magnitude of +5.38.[2] Based upon an annual parallax shift of 24.37 mas as seen from Earth, it is located 131 light years from the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Tucana |
| Right ascension | 00h 42m 28.37166s[1] |
| Declination | −65° 28′ 04.9100″[1] |
| Apparent magnitude (V) | +5.38[2] |
| Characteristics | |
| Spectral type | F6 V[3] |
| U−B color index | +0.00[2] |
| B−V color index | +0.50[2] |
| Astrometry | |
| Radial velocity (Rv) | 33.962±0.796[4] km/s |
| Proper motion (μ) | RA: +53.07[1] mas/yr Dec.: +40.94[1] mas/yr |
| Parallax (π) | 24.37 ± 0.27[1] mas |
| Distance | 134 ± 1 ly (41.0 ± 0.5 pc) |
| Absolute magnitude (MV) | +2.75[5] |
| Orbit[6] | |
| Period (P) | 4.8202 d |
| Eccentricity (e) | 0.02 |
| Periastron epoch (T) | 2419299.11 JD |
| Semi-amplitude (K1) (primary) | 26.1 km/s |
| Details | |
| ρ Tuc A | |
| Mass | 1.66[7] M☉ |
| Luminosity | 9.7[8] L☉ |
| Surface gravity (log g) | 3.64±0.11[4] cgs |
| Temperature | 6,034±54[4] K |
| Metallicity [Fe/H] | −0.26[4] dex |
| Rotational velocity (v sin i) | 23.5±1.2[5] km/s |
| Age | 2.64[3] Gyr |
| ρ Tuc B | |
| Mass | 0.33[7] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a single-lined spectroscopic binary with a close, nearly circular orbit having a period of 4.82 days and an eccentricity of 0.02.[6] The primary member, component A, is a yellow-white hued F-type main sequence star with a stellar classification of F6 V.[3] It is around 2.6 billion years old and a member of the thin disk population.[3] The primary has about 1.66 times the mass of the Sun while the secondary is just 0.33 times the Sun's mass.[7]
References
- van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- Ibukiyama, A.; Arimoto, N. (November 2002), "HIPPARCOS age-metallicity relation of the solar neighbourhood disc stars", Astronomy and Astrophysics, 394: 927–941, arXiv:astro-ph/0207108, Bibcode:2002A&A...394..927I, doi:10.1051/0004-6361:20021157.
- Kunder, Andrea; et al. (February 2017), "The Radial Velocity Experiment (RAVE): Fifth Data Release", The Astronomical Journal, 153 (2): 30, arXiv:1609.03210, Bibcode:2017AJ....153...75K, doi:10.3847/1538-3881/153/2/75, 75.CS1 maint: multiple names: authors list (link)
- Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911.
- Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424 (2): 727, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213.
- Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv:1401.6827, Bibcode:2014AJ....147...87T, doi:10.1088/0004-6256/147/4/87, 87.
- McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
- "rho Tuc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-04-18.
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