Astronomy:18 Tauri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 45m 09.73954s[1] |
| Declination | +24° 50′ 21.3495″[1] |
| Apparent magnitude (V) | 5.66[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B8 V[4] |
| B−V color index | −0.064±0.012[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.8±0.8[5] km/s |
| Proper motion (μ) | RA: +20.744[1] mas/yr Dec.: −46.538[1] mas/yr |
| Parallax (π) | 7.3405 ± 0.1237[1] mas |
| Distance | 444 ± 7 ly (136 ± 2 pc) |
| Absolute magnitude (MV) | 0.19[2] |
| Details | |
| Mass | 3.34±0.06[3] M☉ |
| Radius | 2.89[6] R☉ |
| Luminosity | 160+18 −15[3] L☉ |
| Surface gravity (log g) | 4.126±0.113[7] cgs |
| Temperature | 13,748±223[7] K |
| Rotational velocity (v sin i) | 212[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
18 Tauri is a single[9] star in the zodiac constellation of Taurus, located 444 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.66.[2] The star is moving further from the Earth with a heliocentric radial velocity of +4.8.[5] It is a member of the Pleiades[10] open cluster, which is positioned near the ecliptic and thus is subject to lunar occultations.[11]
This is a B-type main-sequence star with a stellar classification of B8 V,[4] and is about halfway through its main sequence lifetime.[3] It displays an infrared excess, suggesting the presence of an orbiting debris disk with a black body temperature of 75 K at a separation of 137.8 astronomical unit|AU from the host star.[6] The star has 3.34[3] times the mass of the Sun and 2.89[6] times the Sun's radius. It is radiating 160[3] times the Sun's luminosity from its photosphere at an effective temperature of 13,748 K.[7] 18 Tauri has a high rate of spin, showing a projected rotational velocity of 212 km/s.[3]
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 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 3.2 3.3 3.4 3.5 3.6 3.7 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 4.0 4.1 Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics 11: 29, doi:10.1146/annurev.aa.11.090173.000333, Bibcode: 1973ARA&A..11...29M.
- ↑ 5.0 5.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 6.2 Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series 225 (1): 24, doi:10.3847/0067-0049/225/1/15, 15, Bibcode: 2016ApJS..225...15C.
- ↑ 7.0 7.1 7.2 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.
- ↑ "18 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=18+Tau.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (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
- ↑ Eggen, Olin J. (October 1998), "The Pleiades and alpha Persei Clusters", The Astronomical Journal 116 (4): 1810–1815, doi:10.1086/300533, Bibcode: 1998AJ....116.1810E
- ↑ Meyer, C. et al. (1995), "Observations of lunar occultations at Observatoire de la Cote d'Azur", Astronomy and Astrophysics Supplement 110: 107, Bibcode: 1995A&AS..110..107M. See SAO 76137 on p. 112
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