Astronomy:Y Tauri

From HandWiki
Short description: Variable star in the constellation Taurus
Not to be confused with Upsilon Tauri.
Y Tauri
Location of Y Tauri (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas
Distance2,170 ± 90 ly
(670 ± 30 pc)
Absolute magnitude (MV)−1.1 (near max.)[7]
Details
Mass4.3[8] M☉
Radius219[9] R☉
Luminosity6,025[5] L☉
Surface gravity (log g)0.228[8] cgs
Temperature3,217[10] K
Metallicity [Fe/H]−0.106[8] dex
Other designations
Y Tau, BD+20°1083, HD 38307, HIP 27181, HR 1977
Database references
SIMBADdata

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[11]

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. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 Samus, N. N. 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. ↑ 4.0 4.1 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. doi:10.1093/mnras/staa3689. Bibcode: 2021MNRAS.501..491V. 
  5. ↑ 5.0 5.1 Guandalini, R; Cristallo, S (2013). "Luminosities of carbon-rich asymptotic giant branch stars in the Milky Way". Astronomy & Astrophysics 555: A120. doi:10.1051/0004-6361/201321225. Bibcode: 2013A&A...555A.120G. 
  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. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  7. ↑ Gontcharov, G. A. (October 2011). "The red giant branch in the Tycho-2 catalogue". Astronomy Letters 37 (10): 707–717. doi:10.1134/S1063773711090040. ISSN 1063-7737. Bibcode: 2011AstL...37..707G. 
  8. ↑ 8.0 8.1 8.2 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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  9. ↑ Stassun, Keivan G. et al. (2019-10-01). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  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. doi:10.3847/0004-6256/151/3/59. Bibcode: 2016AJ....151...59C. 
  11. ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. http://www.astrouw.edu.pl/asas/?page=aasc. 
  12. ↑ Backhouse, T. W. (December 1887). "Birmingham 121 Tauri alias Geminorum". The Observatory 10: 429-429. https://articles.adsabs.harvard.edu/pdf/1887Obs....10..429B. 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. https://articles.adsabs.harvard.edu/pdf/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. doi:10.1086/345715. Bibcode: 2003ApJ...584.1035O. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Y_Tauri&oldid=3925219"