Y Tauri

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Y Tauri
Taurus constellation map.svg
Red circle.svg
Location of Y Tauri (circled)
Observation data
Epoch J2000        Equinox J2000
Constellation Taurus [1]
Right ascension 05h 45m 39.4101s [2]
Declination +20° 41′ 42.149″ [2]
Apparent magnitude  (V)6.5 - 9.2 [3]
Characteristics
Evolutionary stage AGB [4] [5]
Spectral type C6.5,4e(N3) [3]
Variable type SRb [3]
Astrometry
Radial velocity (Rv)17.00 [6] km/s
Proper motion (μ)RA: 0.039 [2] mas/yr
Dec.: −4.532 [2] mas/yr
Parallax (π)1.5006±0.0592  mas [2]
Distance 2,170 ± 90  ly
(670 ± 30  pc)
Absolute magnitude  (MV)−1.1 (near max.) [7]
Details
Mass 4.3 [8]   M☉
Radius 219 [9]   R☉
Luminosity 6,025 [5]   L☉
Surface gravity (log g)0.228 [8]   cgs
Temperature 3,217 [10]   K
Metallicity [Fe/H]−0.106 [8]   dex
Other designations
Y Tau, BD+20°1083, HD 38307, HIP 27181, HR 1977
Database references
SIMBAD data

Y Tauri is a carbon star located in the constellation Taurus. Parallax measurements by Gaia put it at a distance of approximately 2,170 light-years (670 parsecs). [2]

A visual band light curve for Y Tauri, plotted from ASAS data YTauLightCurve.png
A visual band light curve for Y Tauri, plotted from ASAS data

In the 19th century, Thomas William Webb and John Birmingham noted that Y Tauri might be a variable star. Thomas William Backhouse confirmed that the star's brightness varies, in 1887. [12] [13] Y Tauri is a semiregular variable star. Its class is SRb, and its primary pulsation cycle lasts 241.5 days. [3] No long secondary period has been identified. [14] It has a radius of 219  R☉, an effective surface temperature of 3,217  K , and a bolometric luminosity of 4,489  L☉. Its mass is calculated to be 4.3  M☉.

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

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. 1 2 3 4 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.
  4. 1 2 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 . Bibcode:2021MNRAS.501..491V. doi: 10.1093/mnras/staa3689 .
  5. 1 2 Guandalini, R; Cristallo, S (2013). "Luminosities of carbon-rich asymptotic giant branch stars in the Milky Way". Astronomy & Astrophysics. 555: A120. arXiv: 1305.4203 . Bibcode:2013A&A...555A.120G. doi:10.1051/0004-6361/201321225. S2CID   54918450.
  6. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 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.
  7. ↑ Gontcharov, G. A. (October 2011). "The red giant branch in the Tycho-2 catalogue". Astronomy Letters. 37 (10): 707–717. arXiv: 1607.00557 . Bibcode:2011AstL...37..707G. doi:10.1134/S1063773711090040. ISSN   1063-7737. S2CID   119272127.
  8. 1 2 3 Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN   0004-6361. S2CID   131780028.
  9. ↑ Stassun, Keivan G.; et al. (2019-10-01). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . hdl: 1721.1/124721 . ISSN   0004-6256. S2CID   166227927.
  10. ↑ Chandler, Colin Orion; McDonald, Iain; Kane, Stephen R. (2016). "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars". The Astronomical Journal. 151 (3): 59. arXiv: 1510.05666 . Bibcode:2016AJ....151...59C. doi: 10.3847/0004-6256/151/3/59 . S2CID   119246448.
  11. ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
  12. ↑ Backhouse, T. W. (December 1887). "Birmingham 121 Tauri alias Geminorum". The Observatory. 10: 429–429. Retrieved 31 August 2025.
  13. ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C . Retrieved 31 August 2025.
  14. ↑ 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. doi: 10.1086/345715 . S2CID   40373007.
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