Categories
Upsilon Tauri
Topic: Astronomy
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Taurus[1] |
| Right ascension | 04h 26m 18.46368s[2] |
| Declination | +22° 48′ 48.8885″[2] |
| Apparent magnitude (V) | 4.28 – 4.31[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | A8 Vn[5] |
| U−B color index | +0.14[6] |
| B−V color index | +0.25[6] |
| Variable type | δ Scuti[3] |
| Astrometry | |
| Radial velocity (Rv) | 32.2±1.1[7] km/s |
| Proper motion (μ) | RA: +108.81[2] mas/yr Dec.: −46.80[2] mas/yr |
| Parallax (π) | 21.21 ± 0.25[2] mas |
| Distance | 154 ± 2 ly (47.1 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.91[1] |
| Details | |
| Mass | 1.55[8] M☉ |
| Radius | 1.803[9] R☉ |
| Luminosity | 32.5[10] L☉ |
| Surface gravity (log g) | 3.50[8] cgs |
| Temperature | 7,398±252[8] K |
| Rotation | 0.415 d[9] |
| Rotational velocity (v sin i) | 243[5] km/s |
| Age | 827[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon Tauri (υ Tauri) is a solitary,[12] white-hued star in the zodiac constellation of Taurus, and is a member of the Hyades star cluster.[9] It is faintly visible to the naked eye with an apparent visual magnitude of +4.3. Based upon an annual parallax shift of 21.21 mas seen from Earth, it is around 154 light years from the Sun.
Properties
This is an A-type main sequence star with a stellar classification of A8 Vn.[5] It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.28 to +4.31 with a period of 3.56 hours.[3] At an estimated age of 827 million years,[8] it is spinning rapidly with a rotation period of just 0.415 days.[9] This is giving the star an oblate shape with an equatorial bulge that is 9% larger than the polar radius.[14]
Occasionally this star system shares the Bayer designation υ Tauri with 72 Tauri, which is separated from it by 0.29° in the sky.[15]
Naming
With φ, κ1, κ2 and χ, it composed the Arabic were the Arabs' Al Kalbain, the Two Dogs.[16] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kalbain were the title for five stars : φ as Alkalbain I, χ as Alkalbain II, κ1 as Alkalbain III, κ2 as Alkalbain IV and this star (υ) as Alkalbain V.[17]
References
- ↑ 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z.
- ↑ 5.0 5.1 5.2 Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R.
- ↑ 6.0 6.1 Danziger, I. J.; Dickens, R. J. (July 1967), "Spectrophotometry of New Short-Period Variable Stars", Astrophysical Journal 149: 55, doi:10.1086/149231, Bibcode: 1967ApJ...149...55D.
- ↑ 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.
- ↑ 8.0 8.1 8.2 8.3 8.4 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.
- ↑ 9.0 9.1 9.2 9.3 van Saders, Jennifer L.; Pinsonneault, Marc H. (October 2013), "Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic", The Astrophysical Journal 776 (2): 20, doi:10.1088/0004-637X/776/2/67, 67, Bibcode: 2013ApJ...776...67V.
- ↑ McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "ups Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Tau.
- ↑ 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.
- ↑ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html, retrieved 8 December 2021.
- ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
- ↑ Hoffleit, D.; Jaschek, C. (1991), The Bright Star Catalogue, New Haven: Yale University Observatory, Bibcode: 1991bsc..book.....H.
- ↑ Allen, Richard Hinckley (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 413
- ↑ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology, https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf.
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