Astronomy:Sigma1 Tauri
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 39m 09.22247s[1] |
| Declination | +15° 47′ 59.5345″[1] |
| Apparent magnitude (V) | 5.07[2] |
| Characteristics | |
| Spectral type | A4m[3] |
| U−B color index | 0.190[2] |
| B−V color index | 0.146[2] |
| Astrometry | |
| Radial velocity (Rv) | +26.1±10.0[4] km/s |
| Proper motion (μ) | RA: +41.91[1] mas/yr Dec.: −66.88[1] mas/yr |
| Parallax (π) | 22.18 ± 0.93[1] mas |
| Distance | 147 ± 6 ly (45 ± 2 pc) |
| Absolute magnitude (MV) | 1.73[2] |
| Orbit[5] | |
| Primary | σ1 Tau A |
| Companion | σ1 Tau B |
| Period (P) | 38.951 d |
| Eccentricity (e) | 0.15 |
| Longitude of the node (Ω) | 82° |
| Periastron epoch (T) | 2443094.319 JD |
| Semi-amplitude (K1) (primary) | 7.9 km/s |
| Details | |
| Mass | 1.94[2] M☉ |
| Luminosity | 14.7[6] L☉ |
| Surface gravity (log g) | 4.08[2] cgs |
| Temperature | 8,470[2] K |
| Rotational velocity (v sin i) | 56.5±7.1[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Sigma1 Tauri (σ1 Tauri) is the Bayer designation for a white-hued star in the zodiac constellation of Taurus. It has an apparent visual magnitude of +5.07,[2] which indicates it is visible to the naked eye. Based upon parallax measurements, σ1 Tauri is about 147 light-years from the Sun.
σ1 Tauri is a single-lined spectroscopic binary star system with an orbital period of 38.951 days and an eccentricity of 0.15. The visible component is an Am star with a stellar classification of A4m,[3] indicating it is chemically peculiar A-type star. It is spinning with a projected rotational velocity of 56.5 km/s.[7] The star has 1.9[2] times the mass of the Sun and is radiating 14.7[6] times the Sun's luminosity from its photosphere at an effective temperature of 8,470 K.[2] Although it lies in the general direction of the Hyades cluster, based on parallax measurements it has been excluded from the list of candidate members.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 Iliev, I. Kh. et al. (August 2006), "Abundance analysis of Am binaries and search for tidally driven abundance anomalies - II. HD861, HD18778, HD20320, HD29479, HD96528 and HD108651", Monthly Notices of the Royal Astronomical Society 370 (2): 819–827, doi:10.1111/j.1365-2966.2006.10513.x, Bibcode: 2006MNRAS.370..819I.
- ↑ 3.0 3.1 Cowley, A. et al. (1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
- ↑ 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.
- ↑ Pourbaix, D. et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics 424 (2): 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P.
- ↑ 6.0 6.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 7.0 7.1 Paunzen, E. et al. (February 2013), "A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society 429 (1): 119–125, doi:10.1093/mnras/sts318, Bibcode: 2013MNRAS.429..119P.
- ↑ "sig01 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=sig01+Tau.
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