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Iota Tauri 
Summary
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,[2] and is located at an estimated distance of about 173 light years based upon parallax measurements.[1] The star is moving away from the Sun with a radial velocity of +38 km/s.[5]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 05h 03m 05.74725s[1] |
| Declination | 21° 35′ 23.8627″[1] |
| Apparent magnitude (V) | 4.62[2] |
| Characteristics | |
| Spectral type | A7 V[3] |
| U−B color index | +0.15[4] |
| B−V color index | +0.16[4] |
| Astrometry | |
| Radial velocity (Rv) | +38.30[5] km/s |
| Proper motion (μ) | RA: +68.88[1] mas/yr Dec.: -41.06[1] mas/yr |
| Parallax (π) | 18.88 ± 0.30 mas[1] |
| Distance | 173 ± 3 ly (53.0 ± 0.8 pc) |
| Absolute magnitude (MV) | 1.00[2] |
| Details | |
| Mass | 2.22[6] M☉ |
| Radius | 2.6[7] R☉ |
| Luminosity | 36[6] L☉ |
| Surface gravity (log g) | 3.97[8] cgs |
| Temperature | 8,054[6] K |
| Metallicity [Fe/H] | +0.15[2] dex |
| Rotational velocity (v sin i) | 131[6] km/s |
| Age | 717[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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,[3] 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.
References edit
- ^ a b c d e f 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
- ^ a b c d Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
- ^ a b Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
- ^ a b 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
- ^ a b 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.
- ^ a b c d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789. Vizier catalog entry
- ^ 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. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
- ^ a b c 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. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607. Vizier catalog entry
- ^ 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.
- ^ 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. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
- ^ 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976. Vizier catalog entry