UX Tauri

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UX Tauri
UX Tauri A.jpg
An artist's conception of a circumstellar disk around UX Tauri A, along with several hypothetical protoplanets.
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Taurus [1]
Right ascension 04h 30m 03.99626s [2]
Declination +18° 13 49.4355 [2]
Apparent magnitude  (V)10.5 - 13.9 [3]
Characteristics
Spectral type K2Ve + M1Ve [4]
Variable type T Tau [5]
Astrometry
Radial velocity (Rv)22.90 [6] km/s
Proper motion (μ)RA: 17.18 [2] mas/yr
Dec.: -21.91 [2] mas/yr
Parallax (π)-3.70 [2] ±5.73  mas
Distance 450  ly
(138  pc)
Details [7]
UX Tauri A
Mass 1.25  M
Luminosity 1.3  L
Surface gravity (log g)4.0  cgs
Temperature 4460  K
Age 3  Myr
UX Tauri B
Mass 0.4  M
Luminosity0.5  L
Surface gravity (log g)3.5  cgs
Temperature 3500  K
Age 1  Myr
Other designations
UX Tau, HD 285846, HIP 20990, WDS J04301+1814AB, CCDM J04301+1814AB, 1RXS J043004.5+181342 [8]
Database references
SIMBAD data
A visual band light curve for UX Tauri, plotted from ASAS-SN data UXTauLightCurve.png
A visual band light curve for UX Tauri, plotted from ASAS-SN data

UX Tauri, abbreviated as UX Tau, is a binary star system approximately 450 light-years away in the constellation of Taurus (the Bull). It is notable for the fact that, despite its recent (in stellar terms) creation, the Spitzer Space Telescope discovered that its protoplanetary disk contains a gap. The dust, which normally accumulates in an expanding ring starting right next to the star at such a young age, is either very thin or nonexistent at a range of 0.2 to 56 AU from the star. Typically, this means that the early ancestors of planets may be forming from the disk, though the star only ignited about 1 million years ago. [10] In contrast, Earth was formed approximately 4.54 billion years ago, placing its formation about sixty million years after the Sun's ignition around 4.6 billion years ago.

Contents

See also

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 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600. Vizier catalog entry
  3. "UX Tau". International Variable Star Index. Retrieved 2025-04-30.
  4. Herbig, G. H. (1977). "Radial velocities and spectral types of T Tauri stars". Astrophysical Journal. 214: 747–758. Bibcode:1977ApJ...214..747H. doi: 10.1086/155304 .
  5. Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  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. Magazzu, A. (1991). "Lithium in the pre-main sequence triple system UX Tauri". Astronomy and Astrophysics. 249 (1): 149–155. Bibcode:1991A&A...249..149M.
  8. "UX Tau". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 5 December 2016.
  9. "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 6 January 2022.
  10. "NASA - Youthful Star Sprouts Planets Early". Archived from the original on 2012-10-21. Retrieved 2007-11-28.