# Y Tauri

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Not to be confused with [Upsilon Tauri](/source/Upsilon_Tauri).

**Y Tauri** is a [carbon star](/source/Carbon_star) located in the constellation [Taurus](/source/Taurus_(constellation)). [Parallax](/source/Stellar_parallax) measurements by [Gaia](/source/Gaia_(spacecraft)) put it at a distance of approximately 2,170 light-years (670 parsecs).[1]

In the 19th century, [Thomas William Webb](/source/Thomas_William_Webb) and John Birmingham noted that Y Tauri might be a [variable star](/source/Variable_star). Thomas William Backhouse confirmed that the star's brightness varies, in 1887.[2][3] Y Tauri is a [semiregular variable star](/source/Semiregular_variable_star). Its class is SRb, and its primary pulsation cycle lasts 241.5 days.[4] No long secondary period has been identified.[5] It has a radius of , an [effective surface temperature](/source/Effective_temperature) of 3,217 K, and a [bolometric luminosity](/source/Bolometric_luminosity) of . Its mass is calculated to be .

Y Tauri is losing mass at 4×10-7 solar mass/yr, and is surrounded by dust at a temperature of 1,900 K.[6]

## References

1. Backhouse, T. W. (December 1887). ["Birmingham 121 Tauri alias Geminorum"](https://articles.adsabs.harvard.edu/pdf/1887Obs....10..429B). *The Observatory*. **10**: 429-429. Retrieved 31 August 2025.

1. Cannon, Annie J. (1907). ["Second catalogue of variable stars"](https://articles.adsabs.harvard.edu/pdf/1907AnHar..55....1C). *Annals of Harvard College Observatory*. **55**: 1-94. [Bibcode:1907AnHar..55....1C](https://ui.adsabs.harvard.edu/abs/1907AnHar..55....1C). Retrieved 31 August 2025.

1. Samus, N. N. & Durlevich, O. V. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". *VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S*. **1**. [Bibcode:2009yCat....102025S](https://ui.adsabs.harvard.edu/abs/2009yCat....102025S)

1. Olivier, E. A. & Wood, P. R. (2003). "On the Origin of Long Secondary Periods in Semiregular Variables". *The Astrophysical Journal*. **584** (2): 1035–1041. [Bibcode:2003ApJ...584.1035O](https://ui.adsabs.harvard.edu/abs/2003ApJ...584.1035O). [doi:10.1086/345715](https://doi.org/10.1086/345715). [S2CID 40373007](https://api.semanticscholar.org/CorpusID:40373007)

1. Van De Sande, M.; Walsh, C.; Millar, T. J. (2021). "Chemical modelling of dust-gas chemistry within AGB outflows - III. Photoprocessing of the ice and return to the ISM". *Monthly Notices of the Royal Astronomical Society*. **501** (1): 491. [arXiv:2011.11563](https://arxiv.org/abs/2011.11563). [Bibcode:2021MNRAS.501..491V](https://ui.adsabs.harvard.edu/abs/2021MNRAS.501..491V). [doi:10.1093/mnras/staa3689](https://doi.org/10.1093/mnras/staa3689)

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