Astronomy:Tau Sculptoris
Observation data Equinox J2000.0]] (ICRS) | |
---|---|
Constellation | Sculptor |
Right ascension | 01h 36m 08.50799s[1] |
Declination | −29° 54′ 26.3540″[1] |
Apparent magnitude (V) | +5.69[2] (6.06 + 7.35)[3] |
Characteristics | |
Spectral type | F2 V[4] |
B−V color index | +0.33[2] |
Astrometry | |
Radial velocity (Rv) | +3.00±4.50[5] km/s |
Proper motion (μ) | RA: +117.37[1] mas/yr Dec.: +46.72[1] mas/yr |
Parallax (π) | 14.42 ± 0.81[1] mas |
Distance | 230 ± 10 ly (69 ± 4 pc) |
Absolute magnitude (MV) | 2.04 + 3.02[6] |
Orbit[6] | |
Period (P) | 1503.58 ± 35.32 yr |
Semi-major axis (a) | 3.155±0.132″ |
Eccentricity (e) | 0.604±0.019 |
Inclination (i) | 55.6±0.8° |
Longitude of the node (Ω) | 69.6±0.8° |
Periastron epoch (T) | 2039.79 ± 33.80 |
Argument of periastron (ω) (secondary) | 140.2±2.8° |
Details | |
τ Her A | |
Mass | 1.56[7] M☉ |
Surface gravity (log g) | 3.96±0.14[7] cgs |
Temperature | 7,155±243[7] K |
Metallicity [Fe/H] | −0.12[8] dex |
Rotational velocity (v sin i) | 73.8±7.8[9] km/s |
Age | 1.284[7] Gyr |
τ Her B | |
Mass | 1.37[6] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
Tau Sculptoris (τ Scl, τ Sculptoris) is a binary star[6] system in the southern constellation of Sculptor, about 8° to the east-southeast of Alpha Sculptoris.[11] It is faintly visible to the naked eye with a combined apparent visual magnitude of +5.69.[2] Based upon an annual parallax shift of 14.42 mas as seen from Earth,[1] it is located around 230 light years from the Sun.
The binary nature of this system was discovered by English astronomer John Herschel in 1835. The current orbital elements are based upon a fraction of a single orbit, as the estimated orbital period is around 1,503 years. The system has a semimajor axis of 3.2 arc seconds and an eccentricity of 0.6.[6] The primary member, component A, is a yellow-white hued F-type main sequence star with an apparent magnitude of +6.06[3] and a stellar classification of F2 V.[4] The companion, component B, is a magnitude 7.35 star.[3]
References
- ↑ Jump up to: 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.
- ↑ Jump up to: 2.0 2.1 2.2 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ Jump up to: 3.0 3.1 3.2 Eggleton, P. P.; Tokovinin, A. A. (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, Bibcode: 2008MNRAS.389..869E.
- ↑ Jump up to: 4.0 4.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Jump up to: 6.0 6.1 6.2 6.3 6.4 Cvetkovic, Z.; Novakovic, B. (December 2006), "Orbits For Sixteen Binaries", Serbian Astronomical Journal 173 (173): 73–82, doi:10.2298/SAJ0673073C, Bibcode: 2006SerAJ.173...73C.
- ↑ Jump up to: 7.0 7.1 7.2 7.3 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ Casagrande, L. et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics 530 (A138): 21, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C.
- ↑ Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics 542: A116, doi:10.1051/0004-6361/201118724, Bibcode: 2012A&A...542A.116A.
- ↑ "tau Scl". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=tau+Scl.
- ↑ O'Meara, Steve (2007), Herschel 400 Observing Guide, Cambridge University Press, p. 302, ISBN 978-0521858939, https://books.google.com/books?id=Nyh9fAC_tpIC&pg=PA302.
Original source: https://en.wikipedia.org/wiki/Tau Sculptoris.
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