  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 45m 09.74013s1 |
| Declination | +24° 50′ 21.3432″1 |
| Apparent magnitude (V) | 5.662 |
| Characteristics | |
| Evolutionary stage | main sequence3 |
| Spectral type | B8 V4 |
| B−V color index | −0.064±0.0122 |
| Astrometry | |
| Radial velocity (Rv) | +4.8±0.85 km/s |
| Proper motion (μ) | RA: +20.2181 mas/yr Dec.: −46.1241 mas/yr |
| Parallax (π) | 7.2222±0.0551 mas1 |
| Distance | 452 ± 3 ly (138 ± 1 pc) |
| Absolute magnitude (MV) | 0.192 |
| Details | |
| Mass | 3.34±0.063 M☉ |
| Radius | 2.896 R☉ |
| Luminosity | 160+18 −153 L☉ |
| Surface gravity (log g) | 4.126±0.1137 cgs |
| Temperature | 13,748±2237 K |
| Rotational velocity (v sin i) | 2123 km/s |
| Age | 2041 Myr |
| Other designations | |
| 18 Tau, BD+24°546, GC 4485, HD 23324, HIP 17527, HR 1144, SAO 761378 | |
| Database references | |
| SIMBAD | data |
18 Tauri is a single9 star in the zodiac constellation of Taurus, located 452 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 km/s.5 It is a member of the Pleiades10 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 AU from the host star.6 The star has 3.343 times the mass of the Sun and 2.896 times the Sun's radius. It is radiating 1603 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
References
- Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333.
- Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series, 225 (1): 24, arXiv:1606.01134, Bibcode:2016ApJS..225...15C, doi:10.3847/0067-0049/225/1/15, S2CID 118438871, 15.
- 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- "18 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-20.
- 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976
- Eggen, Olin J. (October 1998), "The Pleiades and alpha Persei Clusters", The Astronomical Journal, 116 (4): 1810–1815, Bibcode:1998AJ....116.1810E, doi:10.1086/300533
- 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