# 18 Tauri

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**18 Tauri** is a single[1] [star](/source/Star) in the [zodiac](/source/Zodiac) [constellation](/source/Constellation) of [Taurus](/source/Taurus_(constellation)), located 452 [light years](/source/Light_year) away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 5.66.[2] The star is moving further from the Earth with a heliocentric [radial velocity](/source/Radial_velocity) of +4.8 km/s.[3] It is a member of the [Pleiades](/source/Pleiades)[4] [open cluster](/source/Open_cluster), which is positioned near the [ecliptic](/source/Ecliptic) and thus is subject to [lunar occultations](/source/Lunar_occultation).[5]

This is a [B-type main-sequence star](/source/B-type_main-sequence_star) with a [stellar classification](/source/Stellar_classification) of B8 V,[6] and is about halfway through its [main sequence](/source/Main_sequence) lifetime.[7] It displays an [infrared excess](/source/Infrared_excess), suggesting the presence of an orbiting debris disk with a [black body](/source/Black_body) temperature of 75 K at a separation of 137.8 AU from the host star.[8] The star has 3.34[7] times the [mass of the Sun](/source/Mass_of_the_Sun) and 2.89[8] times the [Sun's radius](/source/Sun's_radius). It is radiating 160[7] times the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 13,748 K.[9] 18 Tauri has a high rate of spin, showing a [projected rotational velocity](/source/Projected_rotational_velocity) of 212 km/s.[7]

## References

1. Eggleton, P. P. & Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*. **389** (2): 869–879, [arXiv:0806.2878](https://arxiv.org/abs/0806.2878). [Bibcode:2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E). [doi:10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111/j.1365-2966.2008.13596.x). [S2CID 14878976](https://api.semanticscholar.org/CorpusID:14878976)

1. Anderson, E. & Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *Astronomy Letters*. **38** (5): 331, [arXiv:1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode:2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi:10.1134/S1063773712050015](https://doi.org/10.1134/S1063773712050015). [S2CID 119257644](https://api.semanticscholar.org/CorpusID:119257644)

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, [arXiv:1606.08053](https://arxiv.org/abs/1606.08053). [Bibcode:2006AstL...32..759G](https://ui.adsabs.harvard.edu/abs/2006AstL...32..759G). [doi:10.1134/S1063773706110065](https://doi.org/10.1134/S1063773706110065). [S2CID 119231169](https://api.semanticscholar.org/CorpusID:119231169)

1. Eggen, Olin J. (October 1998), "The Pleiades and alpha Persei Clusters", *The Astronomical Journal*. **116** (4): 1810–1815, [Bibcode:1998AJ....116.1810E](https://ui.adsabs.harvard.edu/abs/1998AJ....116.1810E). [doi:10.1086/300533](https://doi.org/10.1086/300533)

1. 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](https://ui.adsabs.harvard.edu/abs/1995A%26AS..110..107M) See SAO 76137 on p. 112

1. Morgan, W. W. & Keenan, P. C. (1973), "Spectral Classification", *Annual Review of Astronomy and Astrophysics*. **11**: 29, [Bibcode:1973ARA&A..11...29M](https://ui.adsabs.harvard.edu/abs/1973ARA%26A..11...29M). [doi:10.1146/annurev.aa.11.090173.000333](https://doi.org/10.1146/annurev.aa.11.090173.000333)

1. Zorec, J. & Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", *Astronomy & Astrophysics*. **537**: A120, [arXiv:1201.2052](https://arxiv.org/abs/1201.2052). [Bibcode:2012A&A...537A.120Z](https://ui.adsabs.harvard.edu/abs/2012A%26A...537A.120Z). [doi:10.1051/0004-6361/201117691](https://doi.org/10.1051/0004-6361/201117691). [S2CID 55586789](https://api.semanticscholar.org/CorpusID:55586789)

1. 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](https://arxiv.org/abs/1606.01134). [Bibcode:2016ApJS..225...15C](https://ui.adsabs.harvard.edu/abs/2016ApJS..225...15C). [doi:10.3847/0067-0049/225/1/15](https://doi.org/10.3847/0067-0049/225/1/15). [S2CID 118438871](https://api.semanticscholar.org/CorpusID:118438871). 15

1. 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](https://arxiv.org/abs/1501.03154). [Bibcode:2015ApJ...804..146D](https://ui.adsabs.harvard.edu/abs/2015ApJ...804..146D). [doi:10.1088/0004-637X/804/2/146](https://doi.org/10.1088/0004-637X/804/2/146). [S2CID 33401607](https://api.semanticscholar.org/CorpusID:33401607)

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