Astronomy:Pi Tauri

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Short description: Star in the constellation Taurus
Pi Tauri
Location of π Tauri (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Taurus[1]
Right ascension  04h 26m 36.37093s[2]
Declination +14° 42′ 49.6126″[2]
Apparent magnitude (V) +4.69[3]
Characteristics
Evolutionary stage horizontal branch[4]
Spectral type G7 IIIa Fe-1[5]
U−B color index +0.72[3]
B−V color index +0.98[3]
Astrometry
Radial velocity (Rv)+31.4±0.3[6] km/s
Proper motion (μ) RA: −9.52[2] mas/yr
Dec.: −31.44[2] mas/yr
Parallax (π)7.83 ± 0.22[2] mas
Distance420 ± 10 ly
(128 ± 4 pc)
Absolute magnitude (MV)−0.84[1]
Details
Mass4.4[7] M☉
Radius22[7] R☉
Luminosity244[8] L☉
Surface gravity (log g)2.39[9] cgs
Metallicity [Fe/H]−0.08[9] dex
Rotational velocity (v sin i)7.1[9] km/s
Age554[10] Myr
Other designations
π Tau, 73 Tau, BD+14°697, HD 28100, HIP 20732, HR 1396, SAO 93935[11]
Database references
SIMBADdata

Pi Tauri (π Tauri) is a solitary,[12] yellow-hued star in the zodiac constellation of Taurus. With an apparent visual magnitude of +4.69,[3] it is bright enough to be visible to the naked eye. Although it appears to lie among the stars of the Hyades cluster, it is not itself a member, being three times farther from Earth than the cluster. The distance to this star, as determined using an annual parallax shift of 7.83 mas as seen from the Earth,[2] is around 420 light years. At that range, the visual magnitude of the star is diminished by extinction of 0.24 magnitudes due to interstellar dust.[13]

This is an evolved G-type giant star with a stellar classification of G7 IIIa Fe-1,[5] where the suffix notation indicates an underabundance of iron in the spectrum. The measured angular diameter is 1.55±0.06 mas.[14] At the estimated distance of Pi Tauri, this yields a physical size of about 22 times the radius of the Sun.[7] It possesses 4.4 times the mass of the Sun[7] and is radiating 244 times the Sun's luminosity[8] at an effective temperature of 5006 K.[9]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  3. ↑ 3.0 3.1 3.2 3.3 Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society 133 (4): 475–493, doi:10.1093/mnras/133.4.475, Bibcode: 1966MNRAS.133..475A. 
  4. ↑ Stock, Stephan; Reffert, Sabine; Quirrenbach, Andreas (2018). "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search". Astronomy and Astrophysics 616: A33. doi:10.1051/0004-6361/201833111. Bibcode: 2018A&A...616A..33S. 
  5. ↑ 5.0 5.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K. 
  6. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  7. ↑ 7.0 7.1 7.2 7.3 Van Belle, Gerard T.; von Braun, Kaspar; Ciardi, David R.; Pilyavsky, Genady; Buckingham, Ryan S.; Boden, Andrew F.; Clark, Catherine A.; Hartman, Zachary et al. (2021). "Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color". The Astrophysical Journal 922 (2): 163. doi:10.3847/1538-4357/ac1687. Bibcode: 2021ApJ...922..163V. 
  8. ↑ 8.0 8.1 Yu, Jie; Khanna, Shourya; Themessl, Nathalie; Hekker, Saskia; Dréau, Guillaume; Gizon, Laurent; Bi, Shaolan (2023). "Revised Extinctions and Radii for 1.5 Million Stars Observed by APOGEE, GALAH, and RAVE". The Astrophysical Journal Supplement Series 264 (2): 41. doi:10.3847/1538-4365/acabc8. Bibcode: 2023ApJS..264...41Y. 
  9. ↑ 9.0 9.1 9.2 9.3 Das, Pradosh Barun; Zucker, Daniel B.; De Silva, Gayandhi M.; Borsato, Nicholas W.; Mura-Guzmán, Aldo; Buder, Sven; Ness, Melissa; Nordlander, Thomas et al. (2025). "The GALAH Survey: Stellar parameters and abundances for 800 000 Gaia RVS spectra using GALAH DR4 and the Cannon". Monthly Notices of the Royal Astronomical Society 538 (2): 605. doi:10.1093/mnras/staf169. Bibcode: 2025MNRAS.538..605D. 
  10. ↑ Ting, Yuan-Sen; Rix, Hans-Walter (2019). "The Vertical Motion History of Disk Stars throughout the Galaxy". The Astrophysical Journal 878 (1): 21. doi:10.3847/1538-4357/ab1ea5. Bibcode: 2019ApJ...878...21T. 
  11. ↑ "pi Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=pi+Tau. 
  12. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  13. ↑ Takeda, Yoichi et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan 60 (4): 781–802, doi:10.1093/pasj/60.4.781, Bibcode: 2008PASJ...60..781T. 
  14. ↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R. 



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