Astronomy:Iota Tauri

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Short description: Double star in the constellation Taurus
ι Tauri
Location of ι Tauri (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Taurus[1]
Right ascension  05h 03m 05.74725s[2]
Declination +21° 35′ 23.8627″[2]
Apparent magnitude (V) 4.62[1]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A7 V[4]
U−B color index +0.15[5]
B−V color index +0.16[5]
Astrometry
Radial velocity (Rv)+38.30[6] km/s
Proper motion (μ) RA: +68.88[2] mas/yr
Dec.: -41.06[2] mas/yr
Parallax (π)18.88 ± 0.30[2] mas
Distance173 ± 3 ly
(53.0 ± 0.8 pc)
Absolute magnitude (MV)1.00[1]
Details
Mass2.22[3] M☉
Radius2.6[7] R☉
Luminosity36[3] L☉
Surface gravity (log g)3.97[8] cgs
Temperature8,054[3] K
Metallicity [Fe/H]+0.15[1] dex
Rotational velocity (v sin i)131[3] km/s
Age717[8] Myr
Other designations
ι Tau, 102 Tauri, BD+21°751, FK5 184, GC 6158, HD 32301, HIP 23497, HR 1620, SAO 76920, WDS J05031+2135AB, GSC 01293-02747
Database references
SIMBADdata

Iota Tauri, Latinized from ι Tauri, is a white-hued star in the zodiac constellation Taurus and an outlying member of the Hyades star cluster.[9] It is visible to the naked eye with an apparent visual magnitude of 4.62,[1] and is located at an estimated distance of about 173 light years based upon parallax measurements.[2] The star is moving away from the Sun with a radial velocity of +38 km/s.[6]

This has been reported as a double star with two components at separation 0.1", both of type A7V and magnitude 5.4.[10][11] The combined spectrum matches a stellar classification of A7 V,[4] which would normally indicate an A-type main-sequence star that is generating energy through hydrogen fusion at its core. It has an estimated age of 717[8] million years.

In Chinese astronomy, the asterism Tiāngāo (天高, Celestial High Terrace) consists of the stars ι Tauri, 97 Tauri, 107 Tauri, and 109 Tauri.[13] The Chinese name for ι Tauri itself is Tiāngāoyī (天高一), the first star of Tiāngāo.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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.  Vizier catalog entry
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z.  Vizier catalog entry
  4. ↑ 4.0 4.1 Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement 99: 135. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A. 
  5. ↑ 5.0 5.1 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers 42 (2): 443. Bibcode: 2014JAVSO..42..443M. Vizier catalog entry
  6. ↑ 6.0 6.1 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. ↑ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. Bibcode: 1999A&A...352..555A.  Vizier catalog entry
  8. ↑ 8.0 8.1 8.2 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D.  Vizier catalog entry
  9. ↑ Varenne, O.; Monier, R. (November 1999), "Chemical abundances of A and F-type stars: the Hyades open cluster", Astronomy and Astrophysics 351: 247–266, Bibcode: 1999A&A...351..247V. 
  10. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.  Vizier catalog entry
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.  Vizier catalog entry
  12. ↑ Yi, Shitong (April 1981) (in zh). 科学出版社. 
  13. ↑ Stellarium, citing Yi Shitong, 1981[12]
  14. ↑ "AEEA 天文教育資訊網" (in zh). http://aeea.nmns.edu.tw/2006/0607/ap060713.html. 



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